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Probing Surface Properties and Reaction Intermediates During Heterogeneous Catalytic Oxidation of Acetaldehyde
Author(s) -
Kydd Richard,
Teoh Wey Yang,
Scott Jason,
Ferri Davide,
Amal Rose
Publication year - 2009
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.200900099
Subject(s) - catalysis , chemistry , acetaldehyde , reactivity (psychology) , oxide , oxygen , carboxylate , inorganic chemistry , metal , yield (engineering) , heterogeneous catalysis , redox , copper , denticity , organic chemistry , materials science , ethanol , medicine , alternative medicine , pathology , metallurgy
The influence of Cu on various metal oxide supports was investigated for the catalytic oxidation of acetaldehyde (ACA). The activity of the catalysts towards ACA conversion and the CO 2 yield decrease in the order: Cu/CeO 2 >Cu/TiO 2 ≈Cu/ZrO 2 > Cu/Al 2 O 3 >Cu/SiO 2 . Spontaneous adsorptive conversion of ACA to surface carboxylates, such as bridging and bidentate acetates, was detected over the basic supports CeO 2 , TiO 2 , and ZrO 2 . Detailed temperature‐programmed studies found the high activity of Cu/CeO 2 to stem mainly from the intrinsically high activity of the CeO 2 support. In contrast, similar studies on Cu/TiO 2 demonstrated the activity improvements imparted by Cu were predominantly additive. Despite the difference in origin of ACA oxidation activity over Cu/CeO 2 and Cu/TiO 2 , the overall concerted effects of basicity‐induced carboxylate formation and availability of surface oxygen were thought to be overriding factors crucial in the overall catalytic reactivity.