Show simple item record

dc.contributor.authorQinghong Zhang
dc.contributor.author张庆红
dc.contributor.authorWei Yang
dc.contributor.authorXiaoxing Wang
dc.contributor.authorYe Wang
dc.contributor.author王野
dc.contributor.authorTetsuya Shishido
dc.contributor.authorKatsuomi Takehira
dc.date.accessioned2011-12-01T02:26:37Z
dc.date.available2011-12-01T02:26:37Z
dc.date.issued2004-11
dc.identifier.citationMICROPOROUS AND MESOPOROUS MATERIALS,2005,77(2-3):223-234zh_CN
dc.identifier.issn1387-1811
dc.identifier.urihttp://dx.doi.org/doi:10.1016/j.micromeso.2004.09.006
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/11273
dc.description.abstractThe 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.isoenzh_CN
dc.publisherELSEVIER SCIENCE BVzh_CN
dc.subjectV-MCN-41zh_CN
dc.subjectFe-MCM-41zh_CN
dc.subjectcoordination structures of heteroatomszh_CN
dc.subjectpartial oxidation of methanezh_CN
dc.titleCoordination structures of vanadium and iron in MCM-41 and the catalytic properties in partial oxidation of methanezh_CN
dc.typeArticlezh_CN


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record