期刊
APPLIED CATALYSIS A-GENERAL
卷 528, 期 -, 页码 142-149出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2016.10.004
关键词
Metathesis; Ethylene; 2-Butene; Tungsten; Ordered mesoporous silicates
资金
- U.S. Department of Agriculture
- National Institute of Food and Agriculture [2011-10006-30362]
- Kansas Board of Regents K*STAR Program
- joint National Science Foundation and Environmental Protection Agency program Networks for Sustainable Material Synthesis and Design (NSF-EPA) [1339661]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1339661] Funding Source: National Science Foundation
Tungsten-incorporated 3D mesoporous-silicates, W-KIT-6, W-KIT-5, and W-SBA-16 catalysts, outperform supported tungsten oxide catalysts (WO3/SiO2 and WO3/KIT-6) for the metathesis of ethylene and 2-butene to propene at 450 degrees C. All catalysts exhibit steady activity and stability during 7 h runs in a fixed-bed reactor. Furthermore, on all mesoporous catalysts, a maximum propylene yield was obtained at an optimum W loading at which the catalyst acidity is also maximum. Slightly delayed addition of the W source during the one-pot synthesis protocol markedly improves the propene yield on W-KIT-6 catalyst. XPS results conclusively show that this enhancement is due to preferential enrichment of active W species on the catalyst surface. Extended runs lasting five days reveal very little loss of activity even which is easily recovered by calcination in air. (C) 2016 Elsevier B.V. All rights reserved.
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