Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 151, Issue 1-2, Pages 115-131Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1381-1169(99)00259-9
Keywords
in situ spectroscopy; diffuse reflectance spectroscopy; supported chromium oxide catalysts; experimental design; chemometrics
Categories
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available