PtSn@S-1&β-Mo_(2)C串联催化剂CO_(2)氧化丙烷脱氢制丙烯性能研究  

Study on performance of PtSn@S-1&β-Mo_(2)C tandem catalyst in CO_(2)-oxidative propane dehydrogenation to propylene

作　　者：夏瑶靓 边凯 刘思蕊 王志群 张光辉[1] 郭新闻[1] XIA Yaoliang;BIAN Kai;LIU Sirui;WANG Zhiqun;ZHANG Guanghui;GUO Xinwen(School of Chemical Engineering,State Key Laboratory of Fine Chemicals,Frontier Science Center for Smart Materials,Dalian University of Technology,Dalian 116024,Liaoning,China;SINOPEC Dalian Research Institute of Petroleum and Petrochemicals,Dalian 116045,Liaoning,China)

机构地区：[1]大连理工大学化工学院,精细化工国家重点实验室,智能材料化工前沿科学中心,辽宁大连116024 [2]中国石化大连石油化工研究院,辽宁大连116045

出　　处：《低碳化学与化工》2024年第7期96-103,共8页Low-Carbon Chemistry and Chemical Engineering

基　　金：国家自然科学基金(21902019);兴辽英才计划青年拔尖人才项目(XLYC2203126)。

摘　　要：PtSn双金属催化剂因具有高活性和高选择性被广泛应用于丙烷脱氢制丙烯反应中。然而在高温下,催化剂易产生积炭从而导致稳定性降低。二氧化碳氧化丙烷脱氢(CO_(2)-PDH)因其有望在转化丙烷的同时兼具消除积炭和推动脱氢反应正向移动的特点,已成为新的研究热点。将逆水煤气催化剂β-Mo_(2)C与丙烷脱氢催化剂PtSn@S-1串联用于CO_(2)-PDH反应中,开发高活性、高选择性和高稳定性的催化剂,并结合XRD、CO_(2)-TPD、C3H6-TPD及热重等方法对催化剂进行了表征。结果表明,在CO_(2)-PDH反应中,PtSn@S-1串联加入β-Mo_(2)C后,粉末混合的串联催化剂PtSn@S-1&β-Mo_(2)C的稳定性明显提升,并在连续运转1440min内未出现失活现象,催化剂的高稳定性归因于反应过程中CO_(2)消除了部分积炭。对反应条件进行了优化,发现在n(CO_(2)):n(C3H8)为1.0、m(PtSn@S-1):m(β-Mo_(2)C)为1.0:0.4时,粉末混合的串联催化剂PtSn@S-1&β-Mo_(2)C在CO_(2)-PDH反应中表现出最佳性能,丙烷转化率在反应500min后稳定在43.0%以上,丙烯选择性超过99%。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.CO_(2)-oxidative propane dehydrogenation(CO_(2)-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 catalystβ-Mo_(2)C with propane dehydrogenation catalyst PtSn@S-1 were mixed in CO_(2)-PDH,aiming to develop highly active,selective and stable catalysts.The catalysts were characterized by XRD,CO_(2)-TPD,C3H6-TPD,and thermogravimetric analysis.The research results indicate that in CO_(2)-PDH,the stability of the powder-mixed tandem catalyst PtSn@S-1&β-Mo_(2)C significantly improves by addingβ-Mo_(2)C 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 CO_(2)during the reaction process.After optimizing the reaction conditions,it is found that when n(CO_(2)):n(C3H8)is 1.0 and m(PtSn@S-1):m(β-Mo_(2)C)is 1.0:0.4,the powder-mixed tandem catalyst PtSn@S-1&β-Mo_(2)C exhibites the best performance in CO_(2)-PDH.The propane conversion rate remaines stable at above 43.0%after 500 min and propylene selectivity exceeds 99%.

关 键 词：PtSn@S-1 β-Mo_(2)C 串联催化剂 二氧化碳氧化丙烷脱氢 

分 类 号：TQ426[化学工程]