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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
Source PublicationMOLECULAR CATALYSIS
ISSN2468-8231
Volume438Pages:47-54
Abstract

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.

KeywordMethacrolein Methacrylic Acid Selective Oxidation Copper Heteropolyoxometalate Catalysts
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.mcat.2017.04.031
Indexed BySCI
Language英语
WOS KeywordSelective Oxidation ; Heteropoly Compounds ; Phosphomolybdic Acid ; Cuo Nanoparticles ; Performance ; Isobutane ; Photoelectron ; Stability ; Spectra ; Vanadyl
WOS Research AreaChemistry
WOS SubjectChemistry, Physical
Funding OrganizationNational Key Research and Development Program of China(2016YFB0601303)
WOS IDWOS:000406565200006
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/23177
Collection多相复杂系统国家重点实验室
Affiliation1.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
Recommended Citation
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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