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- W797112254 abstract "The low pressure methanol synthesis catalysts Cu/ZnO, Cu/ZnO/Al/sub 2/O/sub 3/, and Cu/ZnO/Cr/sub 2/O/sub 3/ were found to contain a new compound identified as a Cu/sup I/ solution in ZnO, which is also an active component of the above catalysts. Combined x-ray diffraction, optical, and XPS-Auger studies are presented that describe the formation, electronic structure, and surface composition of these catalysts. In particular, the surface of the working catalyst is free of carbon, both in the presence and absence of CO/sub 2/ in the feed gas. A synthesis mechanism is proposed whereby the Cu/sup I/ centers nondissociatively chemisorb and activate carbon monoxide and the ZnO surface activates hydrogen. Catalyst deactivation in CO/H/sub 2/mixture is explained as the reduction of Cu/sup I/ to inactive copper metal, while the rate enhancing effect of O/sub 2/, H/sub 2/O, and CO/sub 2/ is due to the maintenance of an oxidation potential high enough to keep the copper in the active Cu/sup I/ state. No special pore distribution or presence of crystalline phases such as spinels is necessary for selectivity of the Cu/ZnO catalyst to the formation of methanol. 10 figures, 63 references, 4 tables." @default.
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- W797112254 date "1979-03-15" @default.
- W797112254 modified "2023-09-27" @default.
- W797112254 title "Catalytic synthesis of methanol from CO/H/sub 2/. I. Phase composition, electronic properties, and activities of the Cu/ZnO/M/sub 2/O/sub 3/ catalysts" @default.
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