Stability and Regeneration of Supported ptSn Catalyst for Propane Dehydrogenation

CRISTINA L. PADRÓ; SERGIO DE MIGUEL; ALBERTO A. CASTRO; OSVALDO A. SCELZA

STUDIES IN SURFACE SCIENCE AND CATALYSIS

Elsevier

Lugar: Amsterdam; Año: 1997 vol. 111 p. 191 - 198

0167-2991

This paper reports the catalytic perfomance for propane dehydrogenation of Pt an PtSn catalysts on inert supports, studied by means of pulse and flow reaction techniques, in order to determine effects of support on catalytic behaviour. K addition to Pt/al2o3 and PtSn/Al2O3, significatly decreases catalyst deactivation, by lowering the amounts of coke deposited on the support and metal, while producing a coke with a lower degree of polymerization. Sn addition to Pt/Al2O3 improves the activity and selectivity to propylene an decreases deactivation. The addition of Sn to Pt/ZnAl2O4 not only enhances activity but also improves catalyst stability. The existence of strong interactions between Pt and Sn with propable alloy formation is suggested both on an acidic support like Al2O3 and on a pH neutral support like ZnAl2O4. Bimetallic PtSn/ZnAl2O4 catalyst appear to have the highest stability and reversibility after several rection steps including the corresponding regeneration steps between them.