In situ UV-Vis diffuse reflectance spectroscopy -: on line activity measurements of supported chromium oxide catalysts:: relating isobutane dehydrogenation activity with Cr-speciation via experimental design

被引：81

作者：

Weckhuysen, BM

Verberckmoes, AA

Debaere, J

Ooms, K

Langhans, I

Schoonheydt, RA

机构：

[1] Katholieke Univ Leuven, Dept Interfasechem, Ctr Oppervlaktechem Katalyse, B-3001 Heverlee, Belgium

[2] Katholieke Univ Leuven, CQ Consultancy, B-3001 Heverlee, Belgium

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2000年 / 151卷 / 1-2期

关键词：

in situ spectroscopy; diffuse reflectance spectroscopy; supported chromium oxide catalysts; experimental design; chemometrics;

D O I：

10.1016/S1381-1169(99)00259-9

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 dehydrogenation of isobutane over supported chromium oxide catalysts was studied by a combination of in situ UV-Vis diffuse reflectance spectroscopy and on line GC analysis. A well-defined set of experiments, based on an experimental design, was carried out to develop mathematical models, which quantitatively relate Cr-speciation and dehydrogenation activity with reaction temperature and time, support composition, gas composition and Cr loading. It will be shown that: (1) the dehydrogenation activity is proportional with the amount of in situ measured surface Cr2+/3+, and maximum for a 7.5 wt.% Cr/Al2O3 catalyst operating at 500 degrees C in 2% isobutane in N-2; and (2) Cr3+-sites are more active in alkane dehydrogenation than Cr2+-sites. This paper is the first example of the use of experimental design for deriving structure-activity relationships in the field of heterogeneous catalysis. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：115 / 131

页数：17

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