Wells?Dawson heteropolyacid supported on silica: isobutane alkylation with C4 olefins

BARONETTI, G.; THOMAS,H.; QUERINI, C.A.

APPLIED CATALYSIS A-GENERAL

ELSEVIER SCIENCE BV

Año: 2001 vol. 217 p. 131 - 141

0926-860X

The alkylation of isobutane with C4 olefins is studied, using heteropolyacids (HPA) with Wells?Dawson (WD) structure supported on silica (WD/SiO2). The catalytic performance of these catalysts is compared with a lanthanum-exchanged Y-zeolite catalyst. The loading of the HPA on silica was varied between 9 and 28 wt.%. These catalysts have activity for trimethylpentanes (TMP) production. The selectivity towards these products is not as high as in the case of the lanthanum containing Y-zeolite. The acidity of WD/SiO2 catalysts increases as the loading increases, as seen by 1H MAS-NMR. Correspondingly, a better TMP production is observed. The increase both in acidity and in the TMP production as a function of the WD content is more noticeable at low loading. The coke formed during the reaction requires high temperatures, 550◦C approximately, in order to be fully removed with an oxygen containing carrier gas. The temperature-programmed oxidation (TPO) profile of this coke displays two peaks, the first one between 80 and 300◦C associated with hydrocarbons that are released upon heating, and the second between 300 and 550◦C, associated with coke that changed its structure during the heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity released upon heating, and the second between 300 and 550◦C, associated with coke that changed its structure during the heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity approximately, in order to be fully removed with an oxygen containing carrier gas. The temperature-programmed oxidation (TPO) profile of this coke displays two peaks, the first one between 80 and 300◦C associated with hydrocarbons that are released upon heating, and the second between 300 and 550◦C, associated with coke that changed its structure during the heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity released upon heating, and the second between 300 and 550◦C, associated with coke that changed its structure during the heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity Correspondingly, a better TMP production is observed. The increase both in acidity and in the TMP production as a function of the WD content is more noticeable at low loading. The coke formed during the reaction requires high temperatures, 550◦C approximately, in order to be fully removed with an oxygen containing carrier gas. The temperature-programmed oxidation (TPO) profile of this coke displays two peaks, the first one between 80 and 300◦C associated with hydrocarbons that are released upon heating, and the second between 300 and 550◦C, associated with coke that changed its structure during the heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity released upon heating, and the second between 300 and 550◦C, associated with coke that changed its structure during the heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity approximately, in order to be fully removed with an oxygen containing carrier gas. The temperature-programmed oxidation (TPO) profile of this coke displays two peaks, the first one between 80 and 300◦C associated with hydrocarbons that are released upon heating, and the second between 300 and 550◦C, associated with coke that changed its structure during the heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity released upon heating, and the second between 300 and 550◦C, associated with coke that changed its structure during the heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity Y-zeolite catalyst. The loading of the HPA on silica was varied between 9 and 28 wt.%. These catalysts have activity for trimethylpentanes (TMP) production. The selectivity towards these products is not as high as in the case of the lanthanum containing Y-zeolite. The acidity of WD/SiO2 catalysts increases as the loading increases, as seen by 1H MAS-NMR. Correspondingly, a better TMP production is observed. The increase both in acidity and in the TMP production as a function of the WD content is more noticeable at low loading. The coke formed during the reaction requires high temperatures, 550◦C approximately, in order to be fully removed with an oxygen containing carrier gas. The temperature-programmed oxidation (TPO) profile of this coke displays two peaks, the first one between 80 and 300◦C associated with hydrocarbons that are released upon heating, and the second between 300 and 550◦C, associated with coke that changed its structure during the heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity released upon heating, and the second between 300 and 550◦C, associated with coke that changed its structure during the heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity approximately, in order to be fully removed with an oxygen containing carrier gas. The temperature-programmed oxidation (TPO) profile of this coke displays two peaks, the first one between 80 and 300◦C associated with hydrocarbons that are released upon heating, and the second between 300 and 550◦C, associated with coke that changed its structure during the heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity released upon heating, and the second between 300 and 550◦C, associated with coke that changed its structure during the heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125◦C) is effective both for coke removal and to recover the catalytic activity heating. A regeneration at intermediate temperatures, e.g. 300◦C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500◦C, most of the coke is