Kinetics of hydrogen chemisorption on high surface

F. C. GENNARI; C. NEYERTZ; G. O. MEYER; P. FORNASIERO; M. GRAZIANI

JOURNAL OF ALLOYS AND COMPOUNDS

Elsevier

Año: 2005 vol. 404 p. 317 - 322

0925-8388

The effect of pre-reduction conditions on the H2 chemisorption kinetics of high surface area Pd(0.53 wt.%)/Ce0.8Zr0.2O2 was investigated by means of temperature-programmed reduction, oxygen-storage capacity, IR spectroscopy and volumetric hydrogen measurements. In the 20-80 C range, the pre-reduction rate was very fast and dependent on temperature, with an apparent activation energy of 58 kJ/mol. Distinction between PdO reduction and H spillover processes is only possible at low H2 pressures. The total H2 uptake and the chemisorption rate strongly decrease by the use of high H2 pressures during the pre-reduction process. Irreversible reduction with the concomitant oxygen vacancies formation occurs at low temperature, as demonstrated by in situ IR experiments. However, H2 uptake on the Pd(0.53 wt.%)/Ce0.8Zr0.2O2 during pre-reduction and chemisorption is recovered by reoxidation at 400 C.