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Synthesis of cis-1,3,3,3-tetrafluoropropene by catalytic isomerization of trans-1,3,3,3-tetrafluoropropene over alumina catalysts
Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2020-08-29 , DOI: 10.1016/j.apcata.2020.117800
Di Zhang , Jianjun Zhang , Dalin Sun

Low global warming potential (GWP) refrigerant cis-1,3,3,3-tetrafluoropropene (HFO-1234ze(Z)) is a promising alternative working fluid for high-temperature heat pump designed for heat recovery in the industrial sector. As part of an effort to mass production of HFO-1234ze(Z), the isomerization of trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)) to HFO-1234ze(Z) is performed to develop a process with high selectivity and high yield. Herein, we prepared the alumina catalysts via calcination, fluorination, and alkaline modification and tested for the trans-cis isomerization of HFO-1234ze. As a result, the alumina catalyst with appropriate weak Lewis acid sites tended to form HFO-1234ze(Z) with selectivity levels of about 97 %–99 % and no deactivation was observed following time on stream of 200 h. Proposed reaction mechanisms were described to understand the reactions over alumina surface. The present work provides a highly efficient synthetic process for industrial production of HFO-1234ze(Z).



中文翻译:

通过在氧化铝催化剂上反式1,3,3,3-四氟丙烯的催化异构化反应合成顺式1,3,3,3-四氟丙烯

低全球变暖潜能值(GWP)制冷剂顺式1,3,3,3-四氟丙烯(HFO-1234ze(Z))是用于工业领域热回收的高温热泵的一种有前途的替代工作流体。作为大规模生产HFO-1234ze(Z)的努力的一部分,将反式1,3,3,3-四氟丙烯(HFO-1234ze(E))异构化为HFO-1234ze(Z)以开发一种高选择性和高收率的工艺。本文中,我们通过煅烧,氟化和碱改性制备了氧化铝催化剂,并测试了HFO-1234ze的反式-顺式异构化。结果,具有适当弱路易斯酸位的氧化铝催化剂趋于形成HFO-1234ze(Z),选择性水平约为97%–99%,并且在200 h的运行时间后未观察到失活。描述了拟议的反应机理以了解氧化铝表面的反应。本工作为工业生产HFO-1234ze(Z)提供了一种高效的合成方法。

更新日期:2020-09-14
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