SUBCARBONYL SPECIES OF MOLYBDENUM HEXACARBONYL SUPPORTED ON SILICA - A DRIFT STUDY

被引：28

作者：

KURHINEN, M ^{[1
]}

VENALAINEN, T ^{[1
]}

PAKKANEN, TA ^{[1
]}

机构：

[1] UNIV JOENSUU,DEPT CHEM,SF-80101 JOENSUU,FINLAND

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1994年 / 98卷 / 40期

关键词：

D O I：

10.1021/j100091a045

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：

Subspecies of partially decarbonylated molybdenum hexacarbonyl supported on silica were studied by diffuse reflectance IR spectroscopy. Mo(CO)(6)/SiO2 was prepared in a fluidized bed reactor by vapor-phase adsorption of molybdenum hexacarbonyl under nitrogen flow. Decarbonylation begins when Mo(CO)(6) has adsorbed onto the silica. Dehydroxylation of the support during calcination facilitates the formation of subspecies of Mo(CO)(6). The activation energy needed for bond formation between a transition metal and silica and for decarbonylation is lower than the desorption energy of physisorbed Mo(CO)(6), and this was seen in the IR spectra as a disappearance of bands due to subspecies. When the supported Mo(CO)(6) was reheated the physisorption bands were the last to disappear from the IR spectra.

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页码：10237 / 10242

页数：6

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