Title: 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
Authors: Weckhuysen, Bert ×
Verberckmoes, AA
Debaere, J
Ooms, Kristine
Langhans, Ivan
Schoonheydt, Robert #
Issue Date: Feb-2000
Publisher: Elsevier science bv
Series Title: Journal of molecular catalysis a-chemical vol:151 issue:1-2 pages:115-131
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 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.
ISSN: 1381-1169
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Surface Chemistry and Catalysis
Chemistry - miscellaneous
Research Center for Operations Research and Business Statistics (ORSTAT), Leuven
× corresponding author
# (joint) last author

Files in This Item:

There are no files associated with this item.

Request a copy


All items in Lirias are protected by copyright, with all rights reserved.

© Web of science