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在不同的焙烧温度下制备了Pt-Sn/SAPO-34催化剂,并使用X射线衍射、N2吸附、X射线荧光光谱、O2脉冲烧炭、H2程序升温还原和透射电镜等手段对催化剂进行了表征.在微型反应器中评价了Pt-Sn/SAPO-34催化剂对丙烷脱氢制丙烯反应的催化性能,考察了焙烧温度和反应气氛对催化剂性能的影响.结果表明,焙烧温度为500oC时,催化剂具有最佳的反应活性.当焙烧温度高于500oC时,催化剂出现不希望的表面变化,例如活性Pt位点的聚集、Pt的团聚、Sn的流失等.当反应温度为595oC时,Pt-Sn/SAPO-34催化性能稳定,且能够保持表面金属状态.
The Pt-Sn / SAPO-34 catalysts were prepared at different calcination temperatures and the catalysts were characterized by X-ray diffraction, N2 adsorption, X-ray fluorescence spectroscopy, O2 pulsed charcoal, H2 temperature programmed reduction and transmission electron microscopy The catalytic performance of Pt-Sn / SAPO-34 catalyst for the dehydrogenation of propane to propene was evaluated in a microreactor, and the effects of calcination temperature and reaction atmosphere on the catalyst performance were investigated. The results showed that when the calcination temperature was 500oC, Has the best reactivity.When the calcination temperature is higher than 500oC, the catalysts exhibit unwanted surface changes such as agglomeration of active Pt sites, agglomeration of Pt, loss of Sn, etc. When the reaction temperature is 595oC, Pt-Sn / SAPO-34 catalytic performance is stable, and able to maintain the surface metal state.