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- W1996768019 abstract "The hydrogenation of CO2over a Zn-deposited polycrystalline Cu surface was performed at 523 K and 18 atm using a high-pressure reactor combined with an XPS–AES apparatus. It was clearly shown that ZnOxspecies formed on the Cu surface during the reaction directly promoted the methanol formation activity, indicating the creation of active sites except for Cu0. At optimum Zn coverage (ΘZn = 0.17) the Zn-deposited Cu surface was sixfold more active than the Zn-free Cu surface for methanol formation. The turnover frequencies (TOF) increased with Zn coverage below ΘZn = 0.17 and decreased above ΘZn = 0.17. The TOF and the activation energy for methanol formation over the Zn-deposited Cu were in fairly good agreement with those for the Cu/ZnO powder catalysts. Thus, the Zn-deposited Cu surface can be regarded as a model of Cu/ZnO catalysts. The postreaction surface analysis by XPS, after evacuation of the reaction mixture at 523 K, showed the formation of ZnOxspecies with a Zn/O ratio of about unity at any Zn coverage. Formate species was observed on the postreaction Cu surface in the presence of the ZnOxspecies. The amount of the formate species increased with ΘZnbelow ΘZn = 0.2 and then slightly decreased at ΘZn > 0.2." @default.
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- W1996768019 date "1996-04-01" @default.
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- W1996768019 title "A Surface Science Investigation of Methanol Synthesis over a Zn-Deposited Polycrystalline Cu Surface" @default.
- W1996768019 doi "https://doi.org/10.1006/jcat.1996.0124" @default.
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