期刊
JOURNAL OF CATALYSIS
卷 277, 期 1, 页码 54-63出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2010.10.010
关键词
Silica-supported copper; Boric oxide; Ethylene glycol; Hydrogenation; Stability
资金
- National Natural Science Foundation of China [20873108, 20923004]
- National Basic Research Program of China [2011CBA00508]
- Key Scientific Project of Fujian Province [2009HZ0002-1]
Stable and efficient B-Cu-SiO2 catalysts for the hydrogenation of dimethyl oxalate (DMO) to ethylene glycol were prepared through urea-assisted gelation followed by postimpregnation with boric acid. Auger electron spectroscopy and CO adsorption by in situ Fourier transform infrared spectroscopy revealed that the Cu+ species on the catalyst surface increased together with an increase in the amount of boric oxide dopant. X-ray diffraction and N2O chemisorption indicated that a suitable amount of boric oxide doping tended to improve copper dispersion and retard the growth of copper particles during DMO hydrogenation. Catalytic stability was greatly enhanced in the B-Cu-SiO2 catalyst with an optimized Cu/B atomic ratio of 6.6, because of the formation and preservation of appropriate distributions of Cu+ and Cu-0 species on the catalyst surfaces. The effect of boric oxide was attributed to its relatively high affinity for electrons, which tended to lower the reducibility of the Cu+ species. (C) 2010 Elsevier Inc. All rights reserved.
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