dc.contributor.author | Qinghong Zhang | |
dc.contributor.author | 张庆红 | |
dc.contributor.author | Wei Yang | |
dc.contributor.author | Xiaoxing Wang | |
dc.contributor.author | Ye Wang | |
dc.contributor.author | 王野 | |
dc.contributor.author | Tetsuya Shishido | |
dc.contributor.author | Katsuomi Takehira | |
dc.date.accessioned | 2011-12-01T02:26:37Z | |
dc.date.available | 2011-12-01T02:26:37Z | |
dc.date.issued | 2004-11 | |
dc.identifier.citation | MICROPOROUS AND MESOPOROUS MATERIALS,2005,77(2-3):223-234 | zh_CN |
dc.identifier.issn | 1387-1811 | |
dc.identifier.uri | http://dx.doi.org/doi:10.1016/j.micromeso.2004.09.006 | |
dc.identifier.uri | https://dspace.xmu.edu.cn/handle/2288/11273 | |
dc.description.abstract | The coordination structures of vanadium and iron introduced into MCM-41, a typical mesoporous silica, by both direct hydrothermal synthesis (DHT) and template-ion exchange (TIE) methods have been studied by X-ray absorption spectroscopy (XANES and EXAFS). Vanadium is tetrahedrally coordinated with oxygen in V-MCM-41 prepared by both methods but the location of vanadium is probably different; vanadium is mainly incorporated inside the framework of MCM-41 by the DHT method as the content is lower than approximately 1 wt%, while the vanadyl tetrahedra are probably dispersed on the wall surface, of MCM-41 over the samples by the TIE method. In the case of Fe-MCM-41, the DHT method results in iron atoms mainly in tetrahedral coordination and isolated from each other in the framework of MCM-41. However, aggregated iron oxides with iron in octahedral coordination are mainly observed in the TIE samples. The V-MCM-41 by the TIE method shows better catalytic performances that by the DHT method in the partial oxidation of methane to formaldehyde with oxygen. However, the Fe-MCM-41 by the DHT method exhibits remarkably higher methane conversion and formaldehyde selectivity than that by the TIE method. (C) 2004 Elsevier Inc. All rights reserved. | zh_CN |
dc.language.iso | en | zh_CN |
dc.publisher | ELSEVIER SCIENCE BV | zh_CN |
dc.subject | V-MCN-41 | zh_CN |
dc.subject | Fe-MCM-41 | zh_CN |
dc.subject | coordination structures of heteroatoms | zh_CN |
dc.subject | partial oxidation of methane | zh_CN |
dc.title | Coordination structures of vanadium and iron in MCM-41 and the catalytic properties in partial oxidation of methane | zh_CN |
dc.type | Article | zh_CN |