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

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 °C showed the best performance, while the catalysts prepared above and below the 500 °C calcination temperature showed undesirable surface changes such as Pt active site degradation, Pt sintering, loss of Sn, etc. At the reaction temperature of 595 °C, Pt-Sn/SAPO-34 was stable and maintained surface metallic properties.

摘要：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 500 °C 时, 催化剂具有最佳的反应活性. 当焙烧温度高于 500 °C 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 595 °C 时, Pt-Sn/SAPO-34 催化性能稳定, 且能够保持表面金属状态.

Graphical abstractThe Pt-Sn/SAPO-34 catalyst was prepared at different calcination temperatures and used for propane dehydrogenation. The catalyst prepared at 500 °C calcination temperature shows superior performance because of the formation of highly active Pt site.Figure optionsDownload full-size imageDownload as PowerPoint slide