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Role of surface acidity on vanadia/silica catalysts used in the oxidative dehydrogenation of ethane

✍ Scribed by J. Le Bars; J.C. Vedrine; A. Auroux; S. Trautmann; M. Baerns

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 790 KB
Volume: 88
Category: Article
ISSN: 0926-860X
DOI: 10.1016/0926-860x(92)80214-w

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✦ Synopsis

The oxidative dehydrogenation of ethane in ethene has been investigated in the 753-863 K temperature range over V2OJSiO2 catalysts prepared by grafting or wet impregnation methods. The acidic features of fresh and used catalysts were studied by ammonia and pyridine adsorption using microcalorimetry and DRIFT spectroscopy. V2OJSi02 catalysts can be regarded as medium acidic materials. At the same conversion level of ethane, selectivity to ethene was favored by low V205 loadings. Ethane conversion increased with the vanadium content and the ammonia uptake of the V2OJSi02 catalysts. Some Br~nsted-type sites disappeared in the course of the catalytic reaction, leading to minor changes in the acidic character of the catalysts.

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