Comparative Incorporation Of Sn And In In Mg(Al)O For The Enhanced Stability Of Pt/Mgal(X)O Catalysts In Propane Dehydrogenation

The catalytic performances of Sn- and In-incorporated Mg(Al)O supported Pt catalysts with various Sn and In loadings in the range of 0.2 3.3 wt.% were comparatively investigated in propane dehydrogenation at 550 degrees C. Compared to Sn-incorporated ones, the introduction of In on the Pt/MgAl(In)O catalysts exhibited superior catalyst stability and propylene yield. As confirmed by the XPS and XANES results, the intimate contact between Pt atoms and well-dispersed InOx species resulted in a more promotional electronic effect on Pt particles. On the other hand, the electron transfer effect of Sn to Pt appeared to be limited due to significant phase segregation of SnO2 observed on the catalyst surface of the Pt/MgAl(Sn)O catalysts. The predominant electronic modification of Pt particles on the Pt/MgAl(In)O catalysts had an essential impact on the inhibition of coke formation and contribution to a better tolerance against catalyst deactivation.