Active site and reaction mechanism for the epoxidation of propylene by oxygen over CuOx/SiO2 catalysts with and without Cs+ modification

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	Active site and reaction mechanism for the epoxidation of propylene by oxygen over CuOx/SiO2 catalysts with and without Cs+ modification
	He, Jieli ; Zhai, Qingge ; Zhang, Qinghong ; Deng, Weiping ; Wang, Ye ; Zhang QH(张庆红) ; Deng WP(邓卫平) ; Wang Y(王野)
刊名	http://dx.doi.org/10.1016/j.jcat.2012.11.032
	2013
关键词	VAPOR-PHASE EPOXIDATION ALKALI-METAL SALTS NITROUS-OXIDE MOLECULAR-OXYGEN EFFICIENT EPOXIDATION SELECTIVE OXIDATION PROPENE EPOXIDATION COPPER CATALYST HIGHER OLEFINS IRON-OXIDE
英文摘要	National Basic Program of China [2010CB732303]; Natural Science Foundation of China [21173174, 21033006, 21161130522, 20923004]; Program for Changjiang Scholars and Innovative Research Team in University [IRT1036]; Key Scientific Project of Fujian Province [2009HZ0002-1]; Among alkali metal ions, Cs+ was found to be the most efficient promoter of the CuOx/SiO2 catalyst for the epoxidation of propylene to propylene oxide (PO) by O-2. Stronger interactions between Cs+ and CuOx nanoparticles were proposed to favor the selective formation of PO. Kinetic studies indicated that PO was formed as a primary product in parallel with acrolein over the CuOx/SiO2 catalyst, but PO readily underwent isomerization to ally] alcohol, followed by oxidation to acrolein, without Cs+ modification. The modification by Cs+ inhibited the isomerization of PO because of the weakened acidity, contributing to the increase in PO selectivity. The inhibition of the reactivity of the lattice oxygen in the presence of Cs+ also promoted PO selectivity by suppressing the allylic oxidation route. In situ X-ray diffraction, CO-adsorbed Fourier-transform infrared, and pulse-reaction studies suggest that Cu-I sites generated during the reaction account for the epoxidation of propylene by O-2. (c) 2012 Elsevier Inc. All rights reserved.
语种	英语
出版者	ACADEMIC PRESS INC ELSEVIER SCIENCE
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/88649]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	He, Jieli,Zhai, Qingge,Zhang, Qinghong,et al. Active site and reaction mechanism for the epoxidation of propylene by oxygen over CuOx/SiO2 catalysts with and without Cs+ modification[J]. http://dx.doi.org/10.1016/j.jcat.2012.11.032,2013.
APA	He, Jieli.,Zhai, Qingge.,Zhang, Qinghong.,Deng, Weiping.,Wang, Ye.,...&王野.(2013).Active site and reaction mechanism for the epoxidation of propylene by oxygen over CuOx/SiO2 catalysts with and without Cs+ modification.http://dx.doi.org/10.1016/j.jcat.2012.11.032.
MLA	He, Jieli,et al."Active site and reaction mechanism for the epoxidation of propylene by oxygen over CuOx/SiO2 catalysts with and without Cs+ modification".http://dx.doi.org/10.1016/j.jcat.2012.11.032 (2013).