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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

By B.M. Weckhuysen, A.A. Verberckmoes, J. Debaere, K. Ooms, I. Langhans and R.A. Schoonheydt

Abstract

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 Cr2qr3q, and maximum for a 7.5 wt.% CrrAl2O3 catalyst operating at 5008C in 2% isobutane in N2; and (2) Cr 3q-sites are more active in\ud alkane dehydrogenation than Cr2q-sites. This paper is the first example of the use of experimental design for deriving\ud structure–activity relationships in the field of heterogeneous catalysis

Topics: Scheikunde
Year: 2000
OAI identifier: oai:dspace.library.uu.nl:1874/21157
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