Post-treatment of Ti-MWW zeolite with potassium fluoride for propylene epoxidation  

作　　者：Xintong Li Xianchen Gong Jilong Wang Shengbo Jin Hao Xu Peng Wu 

机构地区：[1]State Key Laboratory of Petroleum Molecular&Process Engineering,Shanghai Key Laboratory of Green Chemistry and Chemical Processes,School of Chemistry and Molecular Engineering,East China Normal University,Shanghai 200062,China

出　　处：《Frontiers of Chemical Science and Engineering》2024年第8期37-47,共11页化学科学与工程前沿（英文版）

基　　金：support from the National Key R&D Program of China(Grant Nos.2021YFA1501401 and 2023YFB3810602);the National Natural Science Foundation of China(Grant No.22222201)。

摘　　要：Epoxidation of propylene to propylene oxide(PO)with hydrogen peroxide(HPPO)is an environmentally friendly and cost-efficient process in which titanosilicates are used as catalysts.Ti-MWW is a potential industrial catalyst for this process,which involves the addition of HPPO to PO.The silanol groups generated during secondary crystallization unavoidably result in ring-opening of PO and inefficient decomposition of HPPO,which diminish the PO selectivity and the lifespan of Ti-MWW.To address this issue,we conducted post-treatment modifications of the structured Bf-Ti-MWW catalyst with potassium fluoride aqueous solutions.By quenching the silanol groups with potassium fluoride and implanting electron-withdrawing fluoride groups into the Ti-MWW framework,both the catalytic activity and HPPO utilization efficiency were increased.Moreover,the ring opening reaction of PO was prohibited.In a continuous fixed-bed liquid-phase propylene epoxidation reaction,the KF-treated structured Ti-MWW catalyst displayed an exceptionally long lifespan of 2700 h,with a PO yield of 590 g·kg^(-1)·h^(-1).

关 键 词：TITANOSILICATES TI-MWW propylene epoxidation structured catalyst KF modification 

分 类 号：O64[理学—物理化学]