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The states and effects of copper in Keggin-type heteropolyoxometalate catalysts on oxidation of methacrolein to methacrylic acid
Zhou, Lilong1,2; Wang, Lei1; Cao, Yunli1,2; Diao, Yanyan1; Yan, Ruiyi1; Zhang, Suojiang1
2017-09-01
发表期刊MOLECULAR CATALYSIS
ISSN2468-8231
卷号438页码:47-54
摘要

Finding out the mechanism how copper improves the catalytic performance is important to design efficient heteropolyoxometalate catalysts for clean production of methacrylic acid. In this work, copper containing heteropolyoxometalate catalysts (CsCuxH3-2xPMo11 VO40) were synthesized, characterized and used to catalyze the oxidation of methacrolein (MAL) to methacrylic acid. The FT-IR, TG-DTA and XPS results showed that copper was in the forms of Cu2+ and Cu+ and complexes with 4 water molecules in the secondary structure of the catalysts at room temperature. XRD and BET analysis showed that the addition of copper could increase the crystalline size of catalysts, prevent the accumulation of catalyst crystal and make catalysts to be a kind of mesoporous materials with narrow pore width distribution (around 4nm), which is positive for the catalytic performance. The catalytic tests showed that the addition of copper can obviously improve the catalytic performance of catalysts. Copper can get an electron from Keggin structure to improve the oxidation ability of active sites during the oxidation of MAL and give an electron to Keggin structure to make the reduced active sites to be re-oxidized easily. This paper gives a clear picture of copper states in the heteropolyoxometalate catalysts and the mechanism how copper improves the performance of heteropolyoxometalate catalysts s for oxidation reactions. (C) 2017 Elsevier B.V. All rights reserved.

关键词Methacrolein Methacrylic Acid Selective Oxidation Copper Heteropolyoxometalate Catalysts
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
DOI10.1016/j.mcat.2017.04.031
收录类别SCI
语种英语
关键词[WOS]Selective Oxidation ; Heteropoly Compounds ; Phosphomolybdic Acid ; Cuo Nanoparticles ; Performance ; Isobutane ; Photoelectron ; Stability ; Spectra ; Vanadyl
WOS研究方向Chemistry
WOS类目Chemistry, Physical
项目资助者National Key Research and Development Program of China(2016YFB0601303)
WOS记录号WOS:000406565200006
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/23177
专题多相复杂系统国家重点实验室
作者单位1.Chinese Acad Sci, Beijing Key Lab Ion Liquids Clean Proc, Inst Proc Engn, Key Lab Green Proc & Engn,State Key Lab Multiphas, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Chinese Acad Sci, Beijing 100049, Peoples R China
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GB/T 7714
Zhou, Lilong,Wang, Lei,Cao, Yunli,et al. The states and effects of copper in Keggin-type heteropolyoxometalate catalysts on oxidation of methacrolein to methacrylic acid[J]. MOLECULAR CATALYSIS,2017,438:47-54.
APA Zhou, Lilong,Wang, Lei,Cao, Yunli,Diao, Yanyan,Yan, Ruiyi,&Zhang, Suojiang.(2017).The states and effects of copper in Keggin-type heteropolyoxometalate catalysts on oxidation of methacrolein to methacrylic acid.MOLECULAR CATALYSIS,438,47-54.
MLA Zhou, Lilong,et al."The states and effects of copper in Keggin-type heteropolyoxometalate catalysts on oxidation of methacrolein to methacrylic acid".MOLECULAR CATALYSIS 438(2017):47-54.
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