Fluoride-treated H-ZSM-5 as a highly selective and stable catalyst for the production of propylene from methyl halides

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	Fluoride-treated H-ZSM-5 as a highly selective and stable catalyst for the production of propylene from methyl halides
	Wang Y(王野)
刊名	http://dx.doi.org/10.1016/j.jcat.2012.08.014
	2012-11
关键词	METHANOL-TO-HYDROCARBONS DIRECT CONVERSION MOLECULAR-SIEVE LIGHT OLEFINS MAS NMR ZEOLITE CHLOROMETHANE CRACKING ALUMINA HZSM-5
英文摘要	National Basic Research Program of China [2010CB732303]; Natural Science Foundation of China [20923004, 21033006, 21161130522]; Program for Changjiang Scholars and Innovative Research Team in University [IRT1036]; Key Scientific Project of Fujian Province [2009HZ0002-1]; Among several typical zeolites, H-ZSM-5 was found to be a promising catalyst for the conversion of methyl halides (CH3Cl and CH3Br) into propylene. The increase in Si/Al ratio or Na+. exchange degree in ZSM-5 increased the selectivity of propylene but decreased the conversion of methyl halides. The treatment of H-ZSM-5 with ammonium fluoride followed by calcination significantly improved its catalytic performance. With a proper concentration of fluoride, not only the propylene selectivity but also the catalyst stability could be enhanced significantly. We have demonstrated that the acidity and the pore structure are two crucial factors determining the catalytic behaviors. The weaker acidity of the fluoride-treated H-ZSM-5 suppressed the hydrogen-transfer and aromatization reactions, leading to higher selectivity to light olefins. Larger micropores with sizes of 0.73-0.78 nm, which were generated after the fluoride treatment, changed the distribution of methylbenzenes in the "hydrocarbon pool" over catalyst and contributed to higher propylene selectivity. (C) 2012 Elsevier Inc. All rights reserved.
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/62926]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Wang Y. Fluoride-treated H-ZSM-5 as a highly selective and stable catalyst for the production of propylene from methyl halides[J]. http://dx.doi.org/10.1016/j.jcat.2012.08.014,2012.
APA	王野.(2012).Fluoride-treated H-ZSM-5 as a highly selective and stable catalyst for the production of propylene from methyl halides.http://dx.doi.org/10.1016/j.jcat.2012.08.014.
MLA	王野."Fluoride-treated H-ZSM-5 as a highly selective and stable catalyst for the production of propylene from methyl halides".http://dx.doi.org/10.1016/j.jcat.2012.08.014 (2012).