Journal
JOURNAL OF CATALYSIS
Volume 389, Issue -, Pages 421-431Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2020.06.008
Keywords
Prereduction-free; Cu/SiO2 Catalyst; Mannitol; Dimethyl oxalate hydrogenation
Categories
Funding
- National Key R&D Program of China [2017YFB0307301, 2017YFA0206802]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA21020800]
- Science Foundation of Guizhou Province [[2018]2193]
- NSF of China [21703247]
- NSF of Fujian Province [2018J05029, 2019J05156]
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It is highly desirable to design efficient and stable Cu-based catalysts for hydrogenation of C-O bonds. However, a lot of superior Cu-based catalysts were reported by doping with other metal species. In this work, a novel Cu/SiO2 catalyst modified with mannitol was prepared by the ammonia evaporation method. Owing to the CO-release occuring during calcination in nitrogen atmosphere, it can directly realize the reduction of the copper species on the surface without using hydrogen for pre-reduction. As a result, the novel Cu/SiO2 catalyst can rapidly achieve optimum activity and exhibit excellent catalytic activity, higher product selectivity and long-term stability (500 h) in dimethyl oxalate hydrogenation reaction. Furthermore, the analysis of the copper species indicated that the copper species on the surface of the catalyst with mannitol calcined in the nitrogen atmosphere were beneficial for generating stable Cu+ species in a weak reduction atmosphere. Therefore, the mannitol modified Cu/SiO2 catalyst can not only achieve comparable catalytic performance with metal-doped catalysts, but also appears economical and promising. (C) 2020 Published by Elsevier Inc.
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