Isomerization of n-Hexane over Silica-Supported Heteropoly Acids Promoted by the Reduced Ce–Ni Oxides
✍ Scribed by Wenxing Kuang; Alain Rives; Bouchta Ouled Ben Tayeb; Michel Fournier; Robert Hubaut
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 141 KB
- Volume
- 248
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
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.