Effect of Addition of Different Promoters on the Performance of Pt-Sn-K/Al2O3 Catalyst in the Propane Dehydrogenation

The effect of the addition of different promoters, namely, la, ir, re and cs to trimetallic pt-sn-k/al2o3 catalyst on its performance in propane dehydrogenation was studied. the reference trimetallic pt/sn/k and tetrametallic catalysts pt/la/sn/k, pt/ir/sn/k, pt/re/sn/k and pt/sn/cs/k were prepared by sequential impregnation of ã-alumina support. the catalysts were characterized by tpd and tpr tests. catalytic performance tests were carried out in a fixed-bed quartz reactor for propane dehydrogenation activity and propylene selectivity under representative industrial conditions. the pt/sn/cs/k catalyst showed better performances in terms of propylene yield. the performance of pt/sn/cs/k catalysts was further improved by adjusting its cs loading. the addition of cs to pt-sn-k/al2o3 catalyst could improve catalytic performance chiefly through modifying the nature of acidic function of the support.