Photoemission Study of Methanol Adsorption and Decomposition on Pd/CeO2(111)/Cu(111) Thin Film Model Catalyst

Deactivation of Ceria Supported Palladium through C–C Scission during Transfer Hydrogenation of Phenol with Alcohols

“…The reaction of primary alcohols over ceria-based materials has been studied extensively in the context of material property probes, − partial oxidation, ,− and steam reforming processes. − It is generally accepted that the pathway for ethanol steam reforming or partial oxidation over ceria supported platinum group metals (PGM/CeO 2 ) begins with dissociative adsorption to form cerium-coordinated ethoxy. ,,− The dominant reaction pathway for ethoxy over PGM/CeO 2 is through dehydrogenation to acetaldehyde. ,, The acetaldehyde intermediate has been observed to follow several different reaction pathways over PGM/CeO 2 that can be broadly classified as reduction, oxidation, C–C coupling, and C–C cleavage reactions. , The C–C cleavage reaction is proposed to proceed through acetaldehyde dehydrogenation to adsorbed acetyl (CH 3 CO-) species. ,,,,,, The acetyl species can be decomposed to CH 4 , CO, CO 2 , and H 2 through various pathways (e.g., water gas shift, methane reforming, and so on). ,,, Alternatively, the acetyl species can be oxidized by lattice oxygen forming adsorbed acetate species which decompose to CH 4 , CO, CO 2 , and H 2 through various pathways. ,− ,, Acetyl/acetate decomposition is promoted by PGM and has been observed to yield surface carbonates. , …”