INCAPE   05401
INSTITUTO DE INVESTIGACIONES EN CATALISIS Y PETROQUIMICA "ING. JOSE MIGUEL PARERA"
Unidad Ejecutora - UE
artículos
Título:
One-pot synthesis of olefins from aromatic ketones via tandem consecutive hydrogenation-dehydration reactions
Autor/es:
NICOLÁS M. BERTERO; CARLOS R. APESTEGUÍA; ALBERTO J. MARCHI
Revista:
CATALYSIS TODAY
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2011 vol. 172 p. 171 - 176
ISSN:
0920-5861
Resumen:
In this work, the synthesis of aromatic olefins from the corresponding ketones via tandemconsecutive hydrogenation-dehydration reactions was studied. The conversion of acetophenone (AP) to styrene (STY) was used as model reaction. Initially, the liquid-phase hydrogenation of AP to 1-phenylethanol (PHE), using cyclohexane as solvent, was investigated at 363 K and 10 bar over Ni, Co, Cu, Pd and Pt supported on SiO2. Cu/SiO2 was the most selective catalyst yielding 100% PHE. Then, the consecutive dehydration of PHE to STY was studied at 363 K and 2 bar over mesoporous solid acids (Al2O3, SiO2-Al2O3, Al-MCM-41, HPA/SiO2) and acid zeolites (HY, HBEA, HZSM-5). Zeolite HZSM-5 was the most selective catalyst, yielding 96% STY. On the basis of the former results, a mixture of Cu/SiO2 and HZSM-5 was used to investigate the feasibility of performing the one-pot synthesis of STY from AP, by promoting tandem consecutive AP hydrogenation-PHE dehydration reactions. A maximum STY selectivity of about 72% was achieved in a two-step catalytic run: the first step was carried out at 323 K and 20 bar and the second step at 353 K and 1 bar.