Investigation of Surface Structures of Supported ZnO/SiO2 and ZnO-SiO2 Sol-gel Catalysts

Abstract

Abstract: ZnO/SiO₂ and ZnOSiO₂ catalysts were prepared by the impregnation and solgel method, respectively. The characterization of the catalysts by XPSand FTIRindicated that much "free" zinc oxide and unreacted Si—OHexisted on the surface of ZnO/SiO₂ sample. As for ZnOSiO₂ solgel catalyst, the corresponding phenomena were not observed. The prepared samples were also used as the catalysts for decomposition of 2butanol. Ahigh selectivity for dehydrogenation was observed over the supported catalyst. However, a high selectivity for dehydration was shown over the ZnOSiO₂ solgel catalyst. The opposite selectivity for dehydration or dehydrogenation observed over the two kinds of catalysts may be just because of the different surface structures of the catalysts.

Key words: FTIR, XPS, Decomposition of 2-butanol, ZnO/SiO₂, ZnOSiO₂ solgel catalysts, Surface structure

CLC Number:

O643.38

TrendMD:

LIU QingSheng, WANG ZhenLü, YU JianFeng, YANG PiaoPing, WANG GuoJia, YANG HongMao, ZHENG DaFang, WU TongHao. Investigation of Surface Structures of Supported ZnO/SiO₂ and ZnO-SiO₂ Sol-gel Catalysts[J]. Chem. J. Chinese Universities, 2001, 22(12): 2091.

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Investigation of Surface Structures of Supported ZnO/SiO₂ and ZnO-SiO₂ Sol-gel Catalysts

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