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  • Title: Isomerization of n-hexane over silica-supported heteropoly acids promoted by the reduced Ce-Ni oxides.
    Author: Kuang W, Rives A, Ben Tayeb BO, Fournier M, Hubaut R.
    Journal: J Colloid Interface Sci; 2002 Apr 01; 248(1):123-9. PubMed ID: 16290512.
    Abstract:
    The structure and catalytic properties of silica-supported heteropoly acids promoted by the reduced Ce-Ni oxides are first studied by using chemical analysis XRD, FT-Raman, XPS, EPR, TG, surface area measurements, and microreactor test. It is found that silica-supported heteropoly acids have isomerization activity, but are very easy to deactivate by coke deposition. With the promotion of the reduced Ce-Ni oxides, however, the better activity and the higher selectivity to isomers could be obtained, suggesting that the reduced Ce-Ni oxides really have hydrogenating/dehydrogenating functions. Moreover, it is found that the presence of the reduced Ce-Ni oxides is not only beneficial for eliminating the coke deposition, but also effective for maintaining the structure of silica-supported heteropoly acids during reaction. The effect of the composition of the mechanical mixtures of silica-supported heteropoly acids and the Ce-Ni oxides on the catalytic properties has been explored.
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