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- W2056577428 abstract "Chromium oxide–zirconia catalysts were prepared by dry impregnation of powdered Zr(OH)4 with 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, showing the presence of Brönsted and Lewis acid sites on the surface of CrOx/ZrO2. The catalytic behavior of the sample was investigated through the reaction of n-hexane using a pulse technique. It was found that Cr6+ species existing on the surface of catalyst was responsible for the formation of strong acid site and the cracking catalytic activity of n-hexane. However, the Cr6+ species was easily reduced to Cr3+ species during the catalytic reaction of n-hexane and the reduced Cr3+ species was active for benzene formation due to the dehydrocyclization of n-hexane. The reduced Cr3+ species could be reoxidized by treatment with O2 and subsequently the reoxidized catalyst exhibited catalytic activity for the cracking reaction of n-hexane." @default.
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- W2056577428 date "1998-09-01" @default.
- W2056577428 modified "2023-09-25" @default.
- W2056577428 title "Acidic property and catalytic behavior of chromium oxide–zirconia catalyst" @default.
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- W2056577428 doi "https://doi.org/10.1016/s1381-1169(97)00295-1" @default.
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