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| The bimetallic PtSn catalysts supported on different supports (ZSM-5, γ-Al2O3, mesoporous alumina, SBA-15) were prepared and several techniques were employed to study the influence of different supports on the catalytic structure and reaction performances. According to the results of XRD, textual properties and acid measurements for the as-prepared catalysts, the selected support is the main factor to determine the porous character and the acidic properties of the corresponding catalyst. Moreover, the dispersion of metallic particles and the coking behavior seem to be obviously different on different supports. Compared with the other samples, the mesoporous alumina supported catalyst shows the most uniform and narrow distribution of metallic particles. Over this sample, the suitable acid content and the regular pore size distribution may account for the more reactive of the deposited carbon. It is also found that the use of different supports has an obvious influence on the reduction behavior of tin species. In our experiments, the use of mesoporous alumina support results in the strong interaction between Pt and Sn oxides, which is favorable for the formation of main active sites for the reaction. |
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| Keywords:Support; Bimetallic PtSn catalyst; Propane dehydrogenation |
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