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• W2053646320 abstract "The reaction of ethanol has been investigated on the surface of Au/CeO2 by temperature programmed desorption (TPD), infra red (IR) absorption and in steady state catalytic conditions. The objective of this study is to compare Au/CeO2 to the other previously studied CeO2 [J. Catal. 186 (1999) 279], Pd/CeO2 [J. Catal. 186 (1999) 279], Pt/CeO2 [J. Catal. 191 (2000) 30] and Rh/CeO2 [Catal. Today 63 (2000) 327] for the same reaction. At 300 K, the surface is covered with both ethoxide species and weakly bonded ethanol. Most of these species desorb giving back ethanol (about 50%; TPD) by 400–450 K with some formation of acetaldehyde (7.5%; TPD). A small part of the remaining ethoxides gives bridging CO (ν: 1916 cm−1). Most of CO is oxidized to CO2 (CO2/CO≈25, TPD) translating the powerful nature of Au for the oxidation process. In the absence of Au, the same ratio drops to 0.7 [J. Catal. 186 (1999) 279]. By 600 K, the surface is covered with carbonates species (ν: 1524 cm−1). These carbonates are mainly decomposed to CO2; IR and TPD. Steady state reactions in presence of oxygen showed the formation of mainly three hydrocarbon-products with a distribution depending on the reaction temperature. At 573 K, acetaldehyde was the main reaction products. Methane desorbed in two distinct reaction-temperatures (673 and 973 K) while acetone was the largest reaction product at ca. 773 K. Among the non-hydrocarbon products (CO2, CO and H2), CO2 was the largest at low temperatures (up to 700 K with a peak at ca. 573 K (52% molar yield)). Increasing the reaction temperature up to 1073 K resulted in increasing amounts of H2 and CO ca. 10 and 30% molar yield, respectively. Insight into the reaction mechanism is given with the potential role of direct oxidation, water gas shift and reforming of methane discussed." @default.
• W2053646320 created "2016-06-24" @default.
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• W2053646320 date "2004-04-01" @default.
• W2053646320 modified "2023-09-27" @default.
• W2053646320 title "The Reactions of Ethanol over Au/CeO2" @default.
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• W2053646320 doi "https://doi.org/10.1016/j.apcata.2003.10.046" @default.
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