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- W2023200069 abstract "Cu/ZnO/Al2O3, Cu/ZnO/SiO2 and Cu/ZnO/activated carbon impregnation catalysts were studied by temperature-programmed desorption (TPD) after methanol synthesis from CO/H2 (1:2) and CO/H2/CO2 (30:61:9). Carbon monoxide desorption in the temperature range 575–620 K was attributed to the decomposition of previously formed formate on ZnO. The amount of formate was less after reaction in CO/H2/CO2 than in CO/H2, due to the lower number of adsorption sites (surface oxygen vacancies) on ZnO in CO/H2/CO2. Carbon dioxide desorption was found after reaction in CO/H2 in the range 500–570 K and was attributed to decomposition of formate on copper. Most catalysts were much more active in CO/H2/CO2, but the amount of formate detected was usually much smaller. The decomposition temperature of the formate was some 40–90 K lower than of the formate formed in CO/H2, indicating a more reactive species. Evidence was found for the formation of formate from CO/H2 on ZnO and Al2O2 supports. The absence of formate formation on SiO2 and activated carbon supports could be an explanation for the very low activity of silica- and carbon-supported copper in CO/H2." @default.
- W2023200069 created "2016-06-24" @default.
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- W2023200069 date "1993-05-01" @default.
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- W2023200069 title "Temperature-programmed desorption study on supported copper-containing methanol synthesis catalysts" @default.
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- W2023200069 doi "https://doi.org/10.1016/0926-860x(93)85027-m" @default.
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