Study On Catalysts For Selective Combustion Of Hydrogen In The Presence Of Propylene

Propylene is a bulk chemical whose demand is increasing every year recently.The manufacture of propylene via dehydrogenation of propane is a hot spot in the academic field and related industrial area. In this paper it is focused on the process of dehydrogenation of propane coupled with selective oxidation of hydrogen, especially on the technology of high temperature hydrogen combustion and SHC catalysts. Pt-based catalysts have been prepared by aqueous incipient wetness impregnation. Effects of different supports, promoters and metal loadings on the SHC catalysts performance were investigated. Meanwhile some technology conditions were also explored here. The results showed that acid sites on supports are the main reason for propylene conversion and coking, thus causing the loss of propylene and catalytic deactivation. Therefore under high temperature, neutralα-Al2O3 is better than acidγ-Al2O3 to enhance Pt-based catalysts' selectivity and stability to hydrogen oxidization with propylene's presence. It is also discovered that there is an optimal Pt particle size, related metal loadings on some level, which can lead to different catalaytic performances. The addition of promoters, Sn and Li, can help reduce propylene conversion, enhance the selectivity to hydrogen oxydation.