AN INFRARED-SPECTROSCOPY AND TEMPERATURE-PROGRAMMED DESORPTION STUDY OF CO ON MOO3/AL2O3 CATALYSTS - QUANTITATION OF THE MOLYBDENA OVERLAYER

被引：70

作者：

DIAZ, AL ^{[1
]}

BUSSELL, ME ^{[1
]}

机构：

[1] WESTERN WASHINGTON STATE UNIV,DEPT CHEM,MS 9058,BELLINGHAM,WA 98225

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1993年 / 97卷 / 02期

关键词：

D O I：

10.1021/j100104a032

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：

The adsorption of CO on pure gamma-Al2O3 and a series Of MoO3/Al2O3 catalysts with different Mo loading has been investigated using infrared (IR) spectroscopy and temperature-programmed desorption (TPD). Carbon monoxide adsorbs selectively on Al3+ sites on the uncovered, free alumina portion of the surface; these sites are created by dehydroxylation of the alumina. As the Mo loading is increased, the CO adsorption capacity of the catalysts decreases in a linear fashion as the MoO3 overlayer covers an increasing fraction of the alumina support. Overlayer growth saturates at a loading of (42 +/- 3) x 10(13) Mo atoms/cm2 and corresponds to less than a complete monolayer as 14 +/- 5% of the alumina support remains uncovered. Extrapolation of the overlayer growth curve to ''monolayer'' coverage allows calculation of a MoO3 cross-sectional area of approximately 22 angstrom2, in good agreement with values predicted by theoretical models.

引用

页码：470 / 477

页数：8

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