Bimetallic PtSn catalysts with notable activity and selectivity are widely used in propane dehydrogenation to propylene.However,at high temperature,catalysts are prone to carbon deposition,leading to a decrease in stability.CO2-oxidative propane dehydrogenation(CO2-PDH)has become a new research hotspot due to its potential to eliminate carbon deposition and promote the forward movement of dehydrogenation reaction while converting propane.The reverse water-gas shift catalyst β-Mo2C with propane dehydrogenation catalyst PtSn@S-1 were mixed in CO2-PDH,aiming to develop highly active,selective and stable catalysts.The catalysts were characterized by XRD,CO2-TPD,C3H6-TPD,and thermogravimetric analysis.The research results indicate that in CO2-PDH,the stability of the powder-mixed tandem catalyst PtSn@S-1&β-Mo2C significantly improves by adding β-Mo2C in series to PtSn@S-1,and the catalyst remains active without deactivation during continuous operation for 1440 min,and the high stability of the catalyst is attributed to the removal of partial carbon deposition by CO2 during the reaction process.After optimizing the reaction conditions,it is found that when n(CO2):n(C3H8)is 1.0 and m(PtSn@S-1):m(β-Mo2C)is 1.0:0.4,the powder-mixed tandem catalyst PtSn@S-1&β-Mo2C exhibites the best performance in CO2-PDH.The propane conversion rate remaines stable at above 43.0%after 500 min and propylene selectivity exceeds 99%.
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