水热处理对氧化铝载体物化性质及丙烷脱氢性能的影响

摘要

采用水热处理对γ-Al2 O3载体改性，并进行XRD、N2物理吸附-脱附、热重、NH3-TPD及H2-TPR表征。结果表明，γ-Al2 O3经过“再水合-焙烧”过程，晶型变好，表面总酸量降低， Pt-Al2 O3相互作用增加，提高了PtSnK/Al2 O3催化剂的丙烷脱氢转化率、选择性及稳定性。其中，140℃处理4 h时，氧化铝负载的PtSnK催化剂表现出最优的丙烷脱氢性能，100 h内平均转化率为33.6%，平均选择性97.3%，失活参数为15.9%。%γ-Al2 O3 carriers were modified by hydrothermal treatment and characterized by XRD,N2-phys-isorption,TG,NH3-TPD and H2-TPR. The results showed that the crystallinity of γ-Al2 O3 increased after rehydration-calcination process. Hydrothermal treatment decreased the total acid amount of catalyst, enhanced the interaction of Pt-Al2 O3 ,and improved the performance of PtSnK/Al2 O3 catalyst for propane dehydrogenation. When alumina support was treated at 140 ℃ for 4 h,PtSnK/Al2 O3 catalyst exhibited the optimal propane dehydrogenation performance,and its average propane conversion,average selectivity to propene and deactivation ratio were 33. 6%,97. 3% and 15. 9%,respectively,for reaction 100 h.