2002 Volume 45 Issue 3 Pages 187-191
The effects of CeO2 addition to supported Pd catalysts were investigated in the decomposition of MeOH to H2 and CO. The catalytic activity of SiO2-supported Pd was lower than those of Al2O3-, MgO- and ZrO2-supported Pd catalysts. Carbon dioxide and methane were produced in a temperature region higher than 350°C over Pd/Al2O3, Pd/MgO, and Pd/ZrO2 but not over Pd/SiO2. Addition of CeO2 promoted the reaction for all catalysts. The activity of Pd-CeO2/SiO2 was high as that of Pd-CeO2/ZrO2 without losing the high selectivity for CO and H2. XAFS analysis indicated that most of the Pd is metallic particles which are highly dispersed on CeO2/SiO2 and a small part of the Pd is in the oxidized state.
