丙烷脱氢反应中焙烧温度和反应气氛对Pt-Sn/SAPO-34催化性能的影响(英文)

Influence of Calcination Temperature and Reaction Atmosphere on the Catalytic Properties of Pt-Sn/SAPO-34 for Propane Dehydrogenation

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.

Pt-Sn/SAPO-34 catalyst samples were prepared at different calcination temperatures.The catalysts were characterized by X-ray diffraction,N2 adsorption,X-ray fluorescence spectroscopy,O2-pulse coke content measurement,temperature-programmed reduction with hydrogen,and transmission electron microscopy.The activity was measured in a microreactor.The effect of calcination temperature and reaction atmosphere on the catalytic properties of Pt-Sn/SAPO-34 for propane dehydrogenation to propylene was investigated.The catalyst prepared at the calcination temperature of 500 oC showed the best performance,while the catalysts prepared above and below the 500 oC calcination temperature showed undesirable surface changes such as Pt active site degradation,Pt sintering,loss of Sn,etc.At the reaction temperature of 595 oC,Pt-Sn/SAPO-34 was stable and maintained surface metallic properties.