Transesterification of dimethyl oxalate with phenol over a MoO3/SiO2 catalyst prepared by thermal spreading

doi:10.1016/S1872-2067(14)60042-5

Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (7): 1043-1053.DOI: 10.1016/S1872-2067(14)60042-5

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Transesterification of dimethyl oxalate with phenol over a MoO₃/SiO₂ catalyst prepared by thermal spreading

Fubao Zhang^a,c, Xiaopeng Yu^b, Fei Ma^a,d, Xiangui Yang^a,d, Jing Hu^a,d, Zhiyong Deng^a,d, Gongying Wang^a,d

a. Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China;
b. Department of Material and Chemical Engineering, Sichuan University of Science and Engineering, Zigong 643000, Sichuan, China;
c. University of Chinese Academy of Sciences, Beijing 100049, China;
d. Chengdu Organic Chemicals Co., Ltd., Chengdu 610041, Sichuan, China

Received:2013-12-07 Revised:2014-01-20 Online:2014-06-28 Published:2014-06-28
Supported by:
This work was supported by the National Key Technology R&D Program (2013BAC11B05) and the Special Project for the Outstanding Youth Innovation Team of Sichuan Province (2013TD0010).

Abstract

Abstract:

MoO₃/SiO₂ catalysts for the transesterification of dimethyl oxalate (DMO) with phenol were prepared by both the thermal spreading (TS) and incipient wetness impregnation methods. The results showed that the 10%MoO₃/SiO₂ catalyst prepared by TS (10%MoO₃/SiO₂-TS) exhibited higher catalytic performance compared with the 10%MoO₃/SiO₂ catalyst prepared by incipient wetness impregnation (10%MoO₃/SiO₂-C). The catalysts were characterized by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, pyridine-IR spectroscopy, and NH₃ temperature-programmed desorption. These analyses indicated that weak Lewis acid sites were formed on the catalyst surfaces and that the Mo species were present as monomeric MoO₃ rather than as isolated molybdenum oxide or polymolybdate species on both catalysts, although the 10%MoO₃/SiO₂-TS exhibited better dispersion of MoO₃ and a higher surface Mo content than the 10%MoO₃/SiO₂-C. Under the optimal transesterification reaction conditions (1.2 g 10%MoO₃/SiO₂-TS, T=180℃, n(DMO)/n(phenol)=2, t=4 h), the conversion of phenol was 70.9%, and the yields of methyl phenyl oxalate and diphenyl oxalate were 63.1% and 7.7%, respectively.

Key words: Thermal spreading method, MoO₃/SiO₂ catalyst, Methyl phenyl oxalate, Diphenyl oxalate, Transesterification

Fubao Zhang, Xiaopeng Yu, Fei Ma, Xiangui Yang, Jing Hu, Zhiyong Deng, Gongying Wang. Transesterification of dimethyl oxalate with phenol over a MoO₃/SiO₂ catalyst prepared by thermal spreading[J]. Chinese Journal of Catalysis, 2014, 35(7): 1043-1053.

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Transesterification of dimethyl oxalate with phenol over a MoO₃/SiO₂ catalyst prepared by thermal spreading

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