期刊
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
卷 20, 期 4, 页码 1869-1874出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2013.09.004
关键词
Dimethyl ether; Dimethoxymethane; Promotional effect; Sm2O3; Mn-H4SiW12O40/SiO2
资金
- National Natural Science Foundation of China [21373253, 20903114, 20773154]
- Natural Science Foundation of Shanxi Province [2010011015-1]
- Foundation for Young Talents of Institute of Coal Chemistry, Chinese Academy of Sciences [2011SQNRC15]
The promotional effects of Sm2O3 on Mn-H4SiW12O40/SiO2 for dimethyl ether (DME) direct-oxidation to dimethoxymethane (DMM) were investigated. The results showed that Sm2O3 introduction could significantly improve the activity of Mn-H4SiW12O40/SiO2 for DMM formation, and DMM selectivity was remarkably increased from 36.3% to 60.3% when the Sm2O3 content was 1%. The catalysts were characterized by ICP-AES, XRD, NH3-TPD, Pyridine-IR and XPS. The Sm2O3 introduction enhanced the number of Lewis acid sites and weak acid sites and also increased the amount of Mn4+ species of Mn-H4SiW12O40/SiO2, which is favorable for the formation of DMM. (C) 2013 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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