Conversion of syngas into lower olefins over a hybrid catalyst system  

作　　者：Qiao Zhao Hongyu Wang Haoting Liang Xiaoxue Han Chongyang Wei Shiwei Wang Yue Wang Shouying Huang Xinbin Ma 

机构地区：[1]Key Laboratory for Green Chemical Technology of Ministry of Education,Haihe Laboratory of Sustainable Chemical Transformations,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China [2]School of Materials Science and Engineering,National Institute for Advanced Materials,TKL of Metal and Molecule-Based Material Chemistry,Nankai University,Tianjin 300350,China [3]State Key Laboratory of Chemical Safety,SINOPEC Research Institute of Safety Engineering Co.,Ltd.,Qingdao 266104,China [4]Zhejiang Institute of Tianjin University,Ningbo Key Laboratory of Green Petrochemical Carbon Emission Reduction Technology and Equipment,Ningbo 315200,China

出　　处：《Frontiers of Chemical Science and Engineering》2024年第10期95-104,共10页化学科学与工程前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.22108200,22108311);the Natural Science Foundation of Zhejiang Province(Grant No.LQ22B060013);the Haihe Laboratory of Sustainable Chemical Transformations for financial support.

摘　　要：Lower olefins,produced from syngas through Fischer-Tropsch synthesis,has been gaining worldwide attention as a non-petroleum route.However,the process demonstrates limited selectivity for target products.Herein,a hybrid catalyst system utilizing Fe-based catalyst and SAPO-34 was shown to enhance the selectivity toward lower olefins.A comprehensive study was conducted to examine the impact of various operating conditions on catalytic performance,such as space velocity,pressure,and temperature,as well as catalyst combinations,including loading pattern,and mass ratio of metal and zeolite.The findings indicated that the addition of SAPO-34 was beneficial for enhancing catalytic activity.Furthermore,compared with AlPO-34 zeolite,the strong-acid site on SAPO-34 was identified to crack the long-chain hydrocarbons,thus contributing to the lower olefin formation.Nevertheless,an excess of strong-acid sites was found to detrimentally impact the selectivity of lower olefins,attributed to the increased aromatization and polymerization of lower olefins.The detailed analysis of a hybrid catalyst in Fischer-Tropsch synthesis provides a practical strategy for improving lower olefins selectivity,and has broader implications for the application of hybrid catalyst in diverse catalytic systems.

关 键 词：Fischer-Tropsch synthesis lower olefins SAPO-34 hybrid catalyst Febased catalyst 

分 类 号：TK6[动力工程及工程热物理—生物能] O643.36[理学—物理化学] TQ243.1[理学—化学]