DRASTIC SELECTIVITY CHANGE BY SMSI EFFECT IN THE CO-H-2 REACTION OVERPD CEO2/

Selectivity of CO-H-2 reaction over Pd/CeO2 changed drastically from m ethanol to methane by higher temperature reduction (SMSI effect). Faci le isotopic exchange reaction of (CO)-C-12-O-18-(CO)-C-13-O-16 indicat ed the dissociative adsorption of CO over reduced PdiCeO(2), which cor responds to the acceleration of methane formation. Infrared spectrosco pic investigation during the reaction suggested that methanol formatio n sites were formed by the transformation of methane formation sites.