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Effect of vanadyl species in Keggin-type heteropoly catalysts in selective oxidation of methacrolein to methacrylic acid
Zhou, Lilong; Wang, Lei; Zhang, Suojiang; Yan, Ruiyi; Diao, Yanyan
2015-09-01
Source PublicationJOURNAL OF CATALYSIS
ISSN0021-9517
Volume329Issue:SEPPages:431-440
AbstractThree Keggin-type heteropoly catalysts with different vanadyl species, H4PMo11VO40 (V existing in the primary structure), HVOPMo12O40 (V existing as VO2+ in the secondary structure), and V2O5/H3PMo12O40 (V existing in V2O5 before calcination), were prepared and studied to identify the preferable vanadyl species for oxidation of methacrolein to methacrylic acid. The catalysts were characterized by FT-IR, Raman, XRD, UV-vis, EPR, and XPS before and after calcination at different temperatures. The calcined catalysts were applied in the selective oxidation of methacrolein. The chemical state and position of the vanadyl species varied with the treatment temperature. Compared with the VO2+ species in HVOPMo12O40, the VO2+ species generated in H4PMo11VO40 and V2O5/H3PMo12O40 during calcination processes showed very different promotional effects, and the VO2+ species that interact with the Keggin structure turned to be the main active vanadyl species in all the catalysts. The active vanadyl species changed from an independent ion form to a squashed square pyramidal on Keggin structure or defect Keggin structure during the oxidation reaction. The optimum conversion of methacrolein and selectivity to methacrylic acid were obtained on the V2O5/H3PMo12O40 catalyst calcined at 350 degrees C, so a new means of adding vanadium in the Keggin-type heteropoly catalysts to obtain high selectivity to methacrylic acid is proposed. (C) 2015 Elsevier Inc. All rights reserved.
KeywordVanadyl Species Heteropoly Compounds Methacrolein Methacrylic Acid Oxidation
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1016/j.jcat.2015.05.031
Indexed BySCI
Language英语
WOS KeywordONE-STEP SYNTHESIS ; 12-MOLYBDOPHOSPHORIC ACID ; STRUCTURAL EVOLUTION ; ISOBUTYRIC ACID ; CESIUM SALTS ; SOLID-STATE ; AMMONIUM ; ISOBUTANE ; BEHAVIOR ; PROPANE
WOS Research AreaChemistry ; Engineering
WOS SubjectChemistry, Physical ; Engineering, Chemical
WOS IDWOS:000361250800041
Citation statistics
Cited Times:41[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/19569
Collection多相复杂系统国家重点实验室
AffiliationChinese 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
Recommended Citation
GB/T 7714
Zhou, Lilong,Wang, Lei,Zhang, Suojiang,et al. Effect of vanadyl species in Keggin-type heteropoly catalysts in selective oxidation of methacrolein to methacrylic acid[J]. JOURNAL OF CATALYSIS,2015,329(SEP):431-440.
APA Zhou, Lilong,Wang, Lei,Zhang, Suojiang,Yan, Ruiyi,&Diao, Yanyan.(2015).Effect of vanadyl species in Keggin-type heteropoly catalysts in selective oxidation of methacrolein to methacrylic acid.JOURNAL OF CATALYSIS,329(SEP),431-440.
MLA Zhou, Lilong,et al."Effect of vanadyl species in Keggin-type heteropoly catalysts in selective oxidation of methacrolein to methacrylic acid".JOURNAL OF CATALYSIS 329.SEP(2015):431-440.
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