Effects of Zirconia Crystallite Phases on the Structures of MoOx/ZrO2 Catalysts and Their Properties in the Selective Oxidation of Methanol
文献类型：期刊论文
| 作者 | Zhang Sheng-Hong; Zhang Hong-Peng; Li Wei-Zhen; Zhang Wei; Huang Hua; Liu Hai-Chao |
| 刊名 | ACTA PHYSICO-CHIMICA SINICA
 |
| 出版日期 | 2010-07-01 |
| 卷号 | 26期号:7页码:1879-1886 |
| 关键词 | Selective Oxidation Monoclinic Zirconia Tetragonal Zirconia Crystallite Phase Effect Molybdena Methanol |
| ISSN号 | 1000-6818 |
| DOI | 10.3866/PKU.WHXB20100732 |
| 英文摘要 | MoOx 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. |
| 语种 | 英语 |
| WOS记录号 | WOS:000279776400022 |
| 出版者 | PEKING UNIV PRESS |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/68873]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Liu Hai-Chao |
| 作者单位 | Peking Univ, Coll Chem & Mol Engn, State Key Lab Struct Chem Stable & Unstable Speci, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：化学研究所
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