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Effects of Zirconia Crystallite Phases on the Structures of MoOx/ZrO2 Catalysts and Their Properties in the Selective Oxidation of Methanol
Zhang Sheng-Hong; Zhang Hong-Peng; Li Wei-Zhen; Zhang Wei; Huang Hua; Liu Hai-Chao
2010-07-01
Source PublicationACTA PHYSICO-CHIMICA SINICA
ISSN1000-6818
Volume26Issue:7Pages:1879-1886
AbstractMoOx supported on pure monoclinic zirconia (m-ZrO2) and tetragonal zirconia (t-ZrO2) with different Mo surface densities were prepared and their structures were characterized by X. ray diffraction, Raman spectroscopy and temperature. programmed reduction in H-2. At Mo surface densities lower than the theoretical monolayer coverage (similar to 5 nm(-2)), isolated MoOx and two. dimensional polymolybdates were dominant on the m-ZrO2 surface while MoO3 crystallites were still present on the t-ZrO2 surface indicating a favorable dispersion of MoOx on m-ZrO2. As the Mo surface densities increased to more than monolayer coverage, MoOx tended to form ZrMo2O8 on the ZrO2 surface by a solid reaction at 600 degrees C, which was more prevalent on m. ZrO2 than on t-ZrO2. The acidity of the MoOx/ZrO2 catalysts increased with an increase in the Mo surface density indicating that ZrMo2O8 is more acidic than dispersed MoOx. Catalysts prepared using t-ZrO2 resulted in more acidic MoOx/ZrO2 and consequently higher selectivity for dimethyl ether during the selective oxidation of methanol was achieved. The MoOx structures were more reducible on the m. ZrO2 surface leading to improved activity for the oxidation of methanol to formaldehyde, dimethoxymethane and methylformate. An understanding of the effect of ZrO2 crystallite phase on the structures of the MoOx species and their catalytic properties for the selective oxidation of methanol provides useful information for the study of other metal oxides such as VOx, and the design of catalysts that are bifunctional in terms of acidity and redox activity.
KeywordSelective Oxidation Monoclinic Zirconia Tetragonal Zirconia Crystallite Phase Effect Molybdena Methanol
DOI10.3866/PKU.WHXB20100732
Indexed BySCI
Language英语
WOS IDWOS:000279776400022
PublisherPEKING UNIV PRESS
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/68874
Collection中国科学院化学研究所
Corresponding AuthorLiu Hai-Chao
AffiliationPeking Univ, Coll Chem & Mol Engn, State Key Lab Struct Chem Stable & Unstable Speci, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Zhang Sheng-Hong,Zhang Hong-Peng,Li Wei-Zhen,et al. Effects of Zirconia Crystallite Phases on the Structures of MoOx/ZrO2 Catalysts and Their Properties in the Selective Oxidation of Methanol[J]. ACTA PHYSICO-CHIMICA SINICA,2010,26(7):1879-1886.
APA Zhang Sheng-Hong,Zhang Hong-Peng,Li Wei-Zhen,Zhang Wei,Huang Hua,&Liu Hai-Chao.(2010).Effects of Zirconia Crystallite Phases on the Structures of MoOx/ZrO2 Catalysts and Their Properties in the Selective Oxidation of Methanol.ACTA PHYSICO-CHIMICA SINICA,26(7),1879-1886.
MLA Zhang Sheng-Hong,et al."Effects of Zirconia Crystallite Phases on the Structures of MoOx/ZrO2 Catalysts and Their Properties in the Selective Oxidation of Methanol".ACTA PHYSICO-CHIMICA SINICA 26.7(2010):1879-1886.
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