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A series of the Pt-Sn/SBA-15 catalysts were prepared and their properties characterized by using X-raypowder diffraction(XRD),N2 adsorption-desorption,high resolution transmission electron microscope,X-ray pho-toelectron spectroscopy(XPS)and H2-temperature programmed reduction.Their performances in long chain alkanedehydrogenation were evaluated in a fixed-bed microreactor with dodecane as a model alkane.The results indicatedthat SBA-15 maintained the well-order mesoporous structure during the reaction.The performance of the catalystwas found not dominated by its textural properties,but by the molar ratio of Sn to Pt which governed the degree ofSn reduction.Owing to the highest degree of Sn reduction,1%(by mass)Pt-1.8%(by mass)Sn/SBA-15 showedthe best catalytic activity.At 0.1 MPa and 470oC,the molar ratio of hydrogen to alkane at 4,and liquid hourly spacevelocity(LHSV)20 h-1,the dodecane conversion is 10%,and the dodecene selectivity is about 70%.
A series of the Pt-Sn / SBA-15 catalysts were prepared and their properties characterized by using X-raypowder diffraction (XRD), N2 adsorption-desorption, high resolution transmission electron microscope, X-ray pho-toelectron spectroscopy H2-temperature programmed reduction. Their performances in long chain alkane dehydrogenation were evaluated in a fixed-bed microreactor with dodecane as a model alkane. The results indicated that SBA-15 maintained the well-order mesoporous structure during the reaction. Performance of the catalystwas found not dominated by its textural properties, but by the molar ratio of Sn to Pt which governed the degree of Sn reduction. Out to the highest degree of Sn reduction, 1% (by mass) Pt- 1.8% (by mass) Sn / SBA- 15 showed the best catalytic activity. At 0.1 MPa and 470 ° C, the molar ratio of hydrogen to alkane at 4, and liquid hourly space velocity (LHSV) 20 h-1, the dodecane conversion is 10%, and the dodecene selectivity was about 70%.