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ZnO/SiO-2 and ZnO|SiO-2 catalysts were prepared by the impregnation and sol|gel method, respectively. The characterization of the catalysts by XPS and FTIR indicated that much “free” zinc oxide and unreacted Si_OH existed on the surface of ZnO/SiO-2 sample. As for ZnO|SiO-2 sol|gel catalyst, the corresponding phenomena were not observed. The prepared samples were also used as the catalysts for decomposition of 2|butanol. A high selectivity for dehydrogenation was observed over the supported catalyst. However, a high selectivity for dehydration was shown over the ZnO|SiO-2 sol|gel 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.
ZnO / SiO - 2 and ZnO | SiO - 2 catalysts were prepared by the impregnation and sol | gel method, respectively. The characterization of the catalysts by XPS and FTIR indicated that much “free ” As for ZnO | SiO - 2 sol | gel catalyst, the corresponding phenomena were not observed. The prepared samples was also used as the catalysts for decomposition of 2 | butanol. A high selectivity for dehydrogenation was observed over the supported catalyst. However, a high selectivity for dehydration was shown over the ZnO | SiO - 2 sol gel 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.