Synthesis and characterisation by X-ray absorption spectroscopy of a suite of seven mesoporous catalysts containing metal ions in framework sites

被引:59
作者
Rey, F
Sankar, G
Maschmeyer, T
Thomas, JM
Bell, RG
Greaves, GN
机构
[1] UCL ROYAL INST GREAT BRITAIN, DAVY FARADAY RES LAB, LONDON W1X 4BS, ENGLAND
[2] SERC, DARESBURY LAB, CCLRC, WARRINGTON WA4 4AD, CHESHIRE, ENGLAND
关键词
MCM-41; mesoporous; X-ray absorption spectroscopy; X-ray diffraction; heteroelement substitution;
D O I
10.1007/BF02431182
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
MCM-41 type mesoporous silicas have been prepared in which one or more of the following elements are accommodated in framework sites: titanium, iron, chromium, vanadium, manganese, boron and aluminium. XRD and FTIR are used as aids to characterisation, which is achieved chiefly - and to a degree that arrives at valence states, bond lengths and coordination numbers of the metal ion - by X-ray absorption spectroscopy (XAS). Ti-containing MCM-41, as well as the Fe-, V- and Cr-containing variants, yield self-consistent, XAS-based, structural data of the respective metal-ion sites. Some of these (especially those containing Ti) are exceptionally good catalysts for the selective oxidation of large organic molecules such as limonene and norbornene.
引用
收藏
页码:121 / 134
页数:14
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