期刊
JOURNAL OF CATALYSIS
卷 339, 期 -, 页码 68-76出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2016.03.033
关键词
Photocatalysis; Methanol; Methyl formate; Copper catalyst; Reaction mechanism
资金
- National Natural Science Foundation of China [21566026]
- key project of the Inner Mongolia Education Department, China [NJZZ13002]
- Natural Science Foundation of Inner Mongolia, China [2014MS0207]
- project of Grassland Talent of Inner Mongolia, China
- ODPC of Inner Mongolia, China
The photocatalytic selective oxidation of methanol to methyl formate at 26-45 degrees C under UV irradiation has been studied for the first time on the catalyst CuO supported on nanocomposites of CuZnAl hydrotalcites and ZnO. The catalyst exhibits high activity for this reaction, with a maximum methyl formate yield of 50% at 30 degrees C and no by-product other than CO2, although both ZnO and hydrotalcites are nonactive for the reaction. The interfaces between ZnO and CuZnAl hydrotalcites play an important role in the reaction, not only supplying necessary hydroxyls but also generating holes with redox potential positive enough for the reaction under UV irradiation due to the band bending at the interface. Copper oxide is photoreduced to metallic Cu during the reaction, which plays a role in trapping photoexcited electrons from the conduction band of the support as well as in dissociating chemisorbed oxygen. (C) 2016 Elsevier Inc. All rights reserved.
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