关键词: 丙烷脱氢, 铂锡催化剂, 形貌控制, 丙烯, 镁铝尖晶石

Abstract:

In recent years, propane dehydrogenation to propylene (PDH) has become the most promising and attractive propylene production technology because the successful large-scale exploitation of shale gas can provide a large amount of cheap propane. Currently, supported PtSn/Al₂O₃ catalysts are mainly used for propane dehydrogenation in industry. In the high temperature reaction of propane dehydrogenation, PtSn nanoparticles are prone to sintering and coke deposition, which causes severe catalyst deactivation. To solve the above problems, we synthesized PtSn/MgAl₂O₄-Sheet catalyst by using MgAl₂O₄-Sheet spinel as support. The catalyst had a large pore size, which was favorable for the adsorption of reactants and the desorption of products in the PDH reaction, and thus improves the activity of the catalyst and reduced the content of coke. Meanwhile, the (111) plane of the MgAl₂O₄ spinel support had a strong interaction with the PtSn nanoparticles, which prevented the sintering of PtSn nanoparticles in the high temperature reaction. In the propane dehydrogenation reaction with the prepared catalyst, the conversion of propane reached 43.2%, the selectivity of propylene reached 95.0%, and the deactivation rate was only 0.008h^-1, which was superior to that with the commercial PtSn/Al₂O₃ catalyst.

Key words: propane dehydrogenation, PtSn catalyst, morphology control, propylene, MgAl₂O₄ spinel