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1 Polish Journal of Chemistry

1 2001

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Effect of Thermal Treatment of the Al3O3 and TiO2 supports on Properties of Dispersed Chromium Oxide in Oxidative Dehydrogenation of Isobutane

Grzybowska B., Samson K., Keromnes L., Wcisło K., Duła R., Serwicka E. M.

Polish Journal of Chemistry

2001

Vol. 75, nr 2

283-292

Chromium oxide has been dispersed on Al2O3 and TiO2 supports, heated between 500-1200 C, and the catalysts obtained have been tested in oxidative dehydrogenation of isobutane at 280 C. For the CrOx/Al2O3 system the thermal treatment of alumina, which leads to the decrease in the specific surface area and polymorphic transformations of the initial -Al2O3 into , and modifications, does not affect the catalytic performance of the catalysts in the reaction under study. On the other hand, the transformation of anatase-TiO2 into rutile-TiO2, occurring on heating at 1000 C, leads to catalysts of a higher activity and selectivity to isobutene. Amelioration of the catalytic properties for CrOx/rutile-TiO2, as compared with CrOx/anatase-TiO2 catalysts, has been ascribed to changes in the structure of the CrOx active centres, evidenced by ESR.