Redox and catalytic behaviors of chromium oxide supported on zirconia

Catalysis Letters - Tập 74 Số 1 - Trang 105-110 - 2001
Sohn, Jong Rack, Ryu, Sam Gon

Tóm tắt

Chromium oxide supported on zirconia was prepared by dry impregnation of powdered Zr(OH)4with an aqueous solution of (NH4)2CrO4 followed by calcining in air. Upon the addition of only a small amount of chromium oxide (1 wt% Cr) to ZrO2, both the acidity and acid strength of the catalyst increased remarkably. The redox and catalytic behaviors of the samples were investigated through XPS and the reaction of cumene using a pulse technique. It was found that Cr6+ species existing on the surface of catalyst were responsible for the formation of strong acid sites and the catalytic activity for cracking of cumene. However, the Cr6+ species were easily reduced to Cr3+ species during the catalytic reaction of cumene and the reduced Cr3+ species were active for α-methylstyrene formation due to the dehydrogenation of cumene. The reduced Cr3+ species could be reoxidized by treatment with O2 and subsequently the reoxidized catalyst exhibited catalytic activity for the cracking reaction of cumene.

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Catalysis Letters

Tập 74 Số 1

105-110

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