NONACIDIC PD/Y ZEOLITE CATALYSTS FROM ORGANOPALLADIUM PRECURSORS - PREPARATION AND CATALYTIC ACTIVITY IN MCP REFORMING

Pd/NaY and Pd/NaHY catalysts have been obtained by chemical vapor deposition of allylcyclopentadienylpalladium and characterized by temperature-programmed reductive decomposition and by EXAFS. In the conversion of methylcyclopentane at 300 degrees C, the non-acidic catalyst shows a constant 100% selectivity towards ring-opening without significant coke deposition. In particular, the deactivation rate is lower than with the non-acidic system prepared by a conventional method. With the bifunctional Pd/NaHY catalyst ring enlargement is predominant, and significant coke deposition occurs as confirmed by temperature-programmed oxidation measurements. (C) 1994 Academic Press, Inc.