A Metal-free Polyimide Photocatalyst for the Oxidation of Amines to Imines  

作　　者：Zhou Yafen Cheng Hong Song Yu Wang Qing Zhao Wenjie Chen Qilin Zhou Limei Xu Bin 

机构地区：[1]Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province,College of Chemistry and Chemical Engineering,China West Normal University,Nanchong 637002,China [2]Key Laboratory of Green Chemistry of Sichuan Institutes of Higher Education,Sichuan University of Science&Engineering,Zigong 643000,China

出　　处：《China Petroleum Processing & Petrochemical Technology》2023年第3期92-103,共12页中国炼油与石油化工（英文版）

基　　金：the Opening Project of Key Laboratory of Green Catalysis of Higher Education Institutes of Sichuan(Grant number:LZJ2101);the Fundamental Research Funds of China West Normal University(Grant number:19D038).

摘　　要：Polyimide(PI) is an organic polymer material with good stability and diverse sources that has attracted widespread attention in the field of photocatalysis. In this study, a series of PI photocatalysts were synthesized by a thermal polymerization approach using pyromellitic dianhydride(PMDA) and various diamine monomers(melamine(MA), 4,4′-oxydianiline, and melem) as the precursors as well as different heating rates. The effects of the diamine precursor and heating rate on the structure, composition, morphology, and optical properties of the as-prepared PI materials were systematically investigated by various characterization techniques. The selective photo-oxidation of benzylamine was used as a model reaction to evaluate the photocatalytic activities of the resulting PI samples for the oxidation of amines to imines. The results revealed that the PI sample prepared using MA and PMDA as the precursors and a heating rate of 7 ℃/min(MA-PI-7) exhibited the best catalytic performance, with 98% benzylamine conversion and 98% selectivity for N-benzylidene benzylamine after 4 h of irradiation. Several benzylamine derivatives and heterocyclic amines also underwent the photo-oxidation reaction over the MA-PI-7 catalyst to afford the corresponding imines with good activity. In addition, MA-PI-7 exhibited good stability over four successive photocatalytic cycles.

关 键 词：POLYIMIDE PHOTOCATALYST OXIDATION amine IMINE 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]