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Oxalate route for promoting activity of manganese oxide catalysts in total VOCs' oxidation: effect of calcination temperature and preparation method
Alternative TitleJ. Mater. Chem. A
Tang, Wenxiang1,3; Wu, Xiaofeng1; Li, Dongyan1,3; Wang, Zhen2; Liu, Gang1,3; Liu, Haidi1; Chen, Yunfa1
2014
Source PublicationJOURNAL OF MATERIALS CHEMISTRY A
ISSN2050-7488
Volume2Issue:8Pages:2544-2554
AbstractA novel template-free oxalate route was applied to synthesize mesoporous manganese oxides with high surface area (355 m(2) g(-1)) and well-defined mesopores which can be obtained in large quantities. The physicochemical properties of the materials were characterized by means of TG, XRD, SEM, TEM, H-2-TPR and XPS techniques. All catalysts were tested on catalytic deep oxidation of benzene, and the effects of calcination temperature on the features of catalyst structure and catalytic activity were investigated. Manganese oxides prepared by oxalate route exhibited better catalytic activities for complete oxidation of benzene, toluene and o-xylene as compared with related manganese oxides prepared by other different methods (NaOH route, NH4HCO3 route and nanocasting strategy), and especially the temperature for benzene conversion of 90% on the oxalate-derived manganese oxide catalysts was 209 degrees C, which is 132 degrees C lower than required for the catalyst prepared by NaOH route. The catalytic performance of manganese oxide is correlated with surface area, pore size, low-temperature reducibility and distribution of surface species. The mole ratio of Mn4+/Mn2+ on the samples which performed with better catalytic activity was close to 1.0. This is good for the redox process of Mn4+ <-> Mn3+ <-> Mn2+ which is the key factor in determining the activity on MnOx, further indicating that the oxalate route is good for keeping the distribution of manganese oxidation states at an appropriate degree. A possible process of VOCs' complete oxidation on manganese oxide catalysts is discussed. In addition, the best catalyst was highly stable with prolonged time on stream and was resistant to water vapor.; A novel template-free oxalate route was applied to synthesize mesoporous manganese oxides with high surface area (355 m(2) g(-1)) and well-defined mesopores which can be obtained in large quantities. The physicochemical properties of the materials were characterized by means of TG, XRD, SEM, TEM, H-2-TPR and XPS techniques. All catalysts were tested on catalytic deep oxidation of benzene, and the effects of calcination temperature on the features of catalyst structure and catalytic activity were investigated. Manganese oxides prepared by oxalate route exhibited better catalytic activities for complete oxidation of benzene, toluene and o-xylene as compared with related manganese oxides prepared by other different methods (NaOH route, NH4HCO3 route and nanocasting strategy), and especially the temperature for benzene conversion of 90% on the oxalate-derived manganese oxide catalysts was 209 degrees C, which is 132 degrees C lower than required for the catalyst prepared by NaOH route. The catalytic performance of manganese oxide is correlated with surface area, pore size, low-temperature reducibility and distribution of surface species. The mole ratio of Mn4+/Mn2+ on the samples which performed with better catalytic activity was close to 1.0. This is good for the redox process of Mn4+ <-> Mn3+ <-> Mn2+ which is the key factor in determining the activity on MnOx, further indicating that the oxalate route is good for keeping the distribution of manganese oxidation states at an appropriate degree. A possible process of VOCs' complete oxidation on manganese oxide catalysts is discussed. In addition, the best catalyst was highly stable with prolonged time on stream and was resistant to water vapor.
KeywordVolatile Organic-compounds Benzene Combustion Lattice Oxygen Air-pollution Ethyl-acetate Co Oxidation Gas-phase Toluene Removal Mnox
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1039/c3ta13847j
URL查看原文
Indexed BySCI
Language英语
WOS KeywordVOLATILE ORGANIC-COMPOUNDS ; BENZENE COMBUSTION ; LATTICE OXYGEN ; AIR-POLLUTION ; ETHYL-ACETATE ; CO OXIDATION ; GAS-PHASE ; TOLUENE ; REMOVAL ; MNOX
WOS Research AreaChemistry ; Energy & Fuels ; Materials Science
WOS SubjectChemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS IDWOS:000331247500014
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/8157
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China
2.Natl Ctr Nanosci & Technol, CAS Key Lab Standardizat & Measurement Nanotechno, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
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Tang, Wenxiang,Wu, Xiaofeng,Li, Dongyan,et al. Oxalate route for promoting activity of manganese oxide catalysts in total VOCs' oxidation: effect of calcination temperature and preparation method[J]. JOURNAL OF MATERIALS CHEMISTRY A,2014,2(8):2544-2554.
APA Tang, Wenxiang.,Wu, Xiaofeng.,Li, Dongyan.,Wang, Zhen.,Liu, Gang.,...&Chen, Yunfa.(2014).Oxalate route for promoting activity of manganese oxide catalysts in total VOCs' oxidation: effect of calcination temperature and preparation method.JOURNAL OF MATERIALS CHEMISTRY A,2(8),2544-2554.
MLA Tang, Wenxiang,et al."Oxalate route for promoting activity of manganese oxide catalysts in total VOCs' oxidation: effect of calcination temperature and preparation method".JOURNAL OF MATERIALS CHEMISTRY A 2.8(2014):2544-2554.
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