Coordination and oxidation states of iron incorporated into MCM-41

被引：0
|
作者：
Lázár, K
Pál-Borbély, G
Szegedi, A
Beyer, HK
机构：
[1] CRC, Inst Isotope & Surface Chem, H-1525 Budapest, Hungary
[2] CRC, Inst Chem, H-1525 Budapest, Hungary
来源：
IMPACT OF ZEOLITES AND OTHER POROUS MATERIALS ON THE NEW TECHNOLOGIES AT THE BEGINNING OF THE NEW MILLENNIUM, PTS A AND B | 2002年 / 142卷
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中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Low iron content Fe-MCM-41 (Si/Fe = 139) samples are characterized under in situ redox conditions by TPR, IR and Mossbauer spectroscopy. In the mesoporous structure full reversibility of the Fe3+ <----> Fe2+ transition is found. Different types of low coordinations are suggested for Fe2+. Reductions in hydrogen and carbon monoxide are compared, the possible role of silanolic -OH groups is discussed and propagation of reduction via (H-2)(+) ions is also suggested. A comparison is made with samples of higher iron contents (Si/Fe = 77, 20 and 12).
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页码：1347 / 1354
页数：8
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