Preparation of SBA-15-Supported beta-Mg2V2O7 Catalysts and Their Properties in Oxidative Dehydrogenation of Propane

doi:10.3724/SP.J.1088.2010.00451

CORC > 化学研究所 > 中国科学院化学研究所

	Preparation of SBA-15-Supported beta-Mg2V2O7 Catalysts and Their Properties in Oxidative Dehydrogenation of Propane
	Zhang Shenghong; Zhang Hongpeng; Sun Jiying; Liu Haichao
刊名	CHINESE JOURNAL OF CATALYSIS
	2010-11-01
卷号	31 期号:11 页码:1374-1380
关键词	Propane Propene Oxidative Dehydrogenation Magnesium Pyrovanadate Supported Catalyst
ISSN号	0253-9837
DOI	10.3724/SP.J.1088.2010.00451
英文摘要	beta-Mg(2)V(2)O(7)catalysts supported on MgO-modified SBA-15 with V surface density of 4.1-8.5 nm(-2) were synthesized by impregnation of the support with a pre-prepared aqueous solution of ammonium metavanadate, citric acid, and magnesium nitrate. The structure and reducibility of the catalysts were characterized by X-ray diffraction, Raman spectroscopy, diffuse reflectance UV-Vis spectroscopy, and temperature-programmed reduction in H-2. For oxidative dehydrogenation (ODH) of propane, bulk beta-Mg(2)V(2)O(7)phase was much less active and selective than alpha-Mg2V2O7 although they have the same dimeric tetrahedral VO4 units connected by bridging V-O-V bonds. Compared to the bulk phase, the greater accessibility of V sites on the supported beta-Mg2V2O7 catalysts led to an increase in not only the initial propane ODH rates by about 20 times but also the initial propene selectivity from 88.3 to 94.1%, as high as that for alpha-Mg2V2O7 (94.6%) that has been considered as the most selective Mg-V-O phase for propane ODH reactions. The selectivity results are consistent with those reflected by the two kinetic parameters, k(1)/k(2) and k(3)/k(1), which represent the ratios of the rate constants for primary propane ODH (k(1)) to propane combustion (k(2)) and that for secondary propene combustion (k(3)) to k(1). Such understanding on the intrinsic catalytic properties of the bulk and supported Mg2V2O7 catalyst provides useful information for design of new Mg-V-O-based catalysts, for example, dispersed alpha-Mg2V2O7 catalyst with high activity and selectivity for propane ODH reactions under mild conditions.
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000287274100012
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/69683]
专题	中国科学院化学研究所
通讯作者	Zhang Shenghong
作者单位	Beijing Univ, Coll Chem & Mol Engn, State Key Lab Struct Chem Stable & Unstable Speci, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Zhang Shenghong,Zhang Hongpeng,Sun Jiying,et al. Preparation of SBA-15-Supported beta-Mg2V2O7 Catalysts and Their Properties in Oxidative Dehydrogenation of Propane[J]. CHINESE JOURNAL OF CATALYSIS,2010,31(11):1374-1380.
APA	Zhang Shenghong,Zhang Hongpeng,Sun Jiying,&Liu Haichao.(2010).Preparation of SBA-15-Supported beta-Mg2V2O7 Catalysts and Their Properties in Oxidative Dehydrogenation of Propane.CHINESE JOURNAL OF CATALYSIS,31(11),1374-1380.
MLA	Zhang Shenghong,et al."Preparation of SBA-15-Supported beta-Mg2V2O7 Catalysts and Their Properties in Oxidative Dehydrogenation of Propane".CHINESE JOURNAL OF CATALYSIS 31.11(2010):1374-1380.