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合成了一系列不同Cr含量的Cr HMS介孔分子筛 ,并对其物化性质进行了表征 .结果表明 ,Cr的引入降低了介孔分子筛骨架结构的规整度和孔径的均一程度 .Cr HMS对苯羟基化和环己烷氧化反应均表现出良好的催化活性 ,并且随Cr含量的增加 ,催化活性呈火山型分布 .对于较易进行的环己烷氧化反应 ,将Cr HMS在H2 气氛中预先还原处理 ,可使催化剂既能保持较高的催化氧化活性 ,又能获得较好的稳定性 .
A series of Cr HMS mesoporous molecular sieves with different Cr contents were synthesized and their physico-chemical properties were characterized.The results show that the introduction of Cr reduces the uniformity of the regularity and the pore size of the mesoporous molecular sieve skeleton structure.Cr HMS on the phenolic hydroxyl And cyclohexane oxidation showed good catalytic activity, and with the increase of Cr content, the catalytic activity was volcano-type distribution.For the more easy cyclohexane oxidation, the Cr HMS pre-reduction treatment in H2 atmosphere , The catalyst can not only maintain a high catalytic oxidation activity, but also get better stability.