Direct propylene epoxidation with molecular oxygen over titanosilicate zeolites

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外文摘要：The direct epoxidation of propylene with molecular oxygen represents a desired route for propylene oxide(PO)production with 100％theoretical atomic economy.However,this aerobic epoxidation reaction suffers from the apparent trade-off between propylene conversion and PO selectivity,and remains a key challenge in catalysis.We report that Ti-Beta zeolites containing isolated framework Ti species can efficiently catalyze the aerobic epoxidation of propylene.Stable propylene conversion of 25％and PO selectivity of up to 90％are achieved at the same time,matching the levels of industrial ethylene aerobic epoxidation processes.H-terminated pentacoordinated Ti species in Beta zeolite frameworks are identified as the preferred active sites for propylene aerobic epoxidation and the reaction is initiated by the participation of lattice oxygen in Ti-OH.These results are expected to spark new technology for the industrial production of PO toward more sustainable chemistry and chemical engineering.

外文关键词：

titanosilicate zeolitespropylene epoxidationmolecular oxygen

作者：

Weijie Li、Bin Qin、Zhuoya Dong、Yuchao Chai、Guangjun Wu、Yanhang Ma、Meng Wang、Xingwu Liu、Ding Ma、Landong Li

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作者单位：

Key Laboratory of Advanced Energy Materials Chemistry of Ministry of Education,College of Chemistry,Nankai University,Tianjin 300071,China

School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China

Beijing National Laboratory for Molecular Sciences,New Cornerstone Science Laboratory,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China

Frontiers Science Center for New Organic Matter,College of Chemistry,Nankai University,Tianjin 300071,China

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出版年：

2024

DOI：

10.1093/nsr/nwae305

国家科学评论(英文版)

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ISSN：

年,卷(期)：2024.11(11)