期刊
TOPICS IN CATALYSIS
卷 60, 期 19-20, 页码 1735-1743出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11244-017-0850-9
关键词
Cu; Methanol synthesis catalyst; CO adsorption; DRIFTS
资金
- Max Planck Society
Carbon monoxide was applied as probe molecule to compare the surface of a ZnO-containing (Cu/ZnO:Al) and a ZnO-free (Cu/MgO) methanol synthesis catalyst (copper content 70 atomic %) after reduction in hydrogen at 523 K by DRIFT spectroscopy. Nano-structured, mainly metallic copper was detected on the surface of the Cu/MgO catalyst. In contrast, the high energy of the main peak in the spectrum of CO adsorbed on reduced Cu/ZnO:Al (2125 cm(-1)) proves that metallic copper is largely absent on the surface of this catalyst. The band is assigned to Zn delta+-CO. The presence of not completely reduced Cu delta+-CO species cannot be excluded. The results are interpreted in terms of a partial coverage of the copper nano-particles in the Cu/ZnO:Al catalyst by a thin layer of metastable, defective zinc oxide. Minor contributions in the spectrum at 2090 and 2112 cm(-1) due to nano-structured Cu-0-CO and CO adsorbed on highly defective Cu-0, respectively, indicate that the coverage of metallic copper is not complete.
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