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首页> 外文期刊>Catalysis science & technology >Deboronation-assisted construction of defective Ti(OSi)(3)OH species in MWW-type titanosilicate and their enhanced catalytic performance
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Deboronation-assisted construction of defective Ti(OSi)(3)OH species in MWW-type titanosilicate and their enhanced catalytic performance

机译：Deboronation-assisted施工缺陷Ti (OSi)(3)哦物种MWW-type titanosilicate和增强的催化性能

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摘要

A thorough investigation of the nature of the Ti species in the boron-containing Ti-MWW zeolite has been carried out. It was found that the inactive extra-framework TiO6 species can cover up the zeolite Lewis-acid property through the weak atomic binding forces between the "Ti(iv)" atom and "O" atom (TiO6 species). The nitric acid treatment could remove these TiO6 species easily from the as-synthesized Ti-MWW(P), followed by exposure of the zeolite Lewis acidity. Importantly, the formation of new Ti(OSi)(3)OH species with a strong Lewis-acid strength, is facilitated in the modification process. Thereby, the modified Ti-MWW zeolite has an improved catalytic activity in alkene epoxidation reactions. The removal of framework B(iv) species around the TiO4 species is an essential step because it can accelerate the transformation of perfect Ti(OSi)(4) species to the defective Ti(OSi)(3)OH species in zeolites. Moreover, the strategy to construct Ti(OSi)(3)OH species was also applied successfully in boron-containing Ti-MCM-56 zeolites. Considering active species environment can be modulated effectively with the removal of framework tetra-coordinate boron, this strategy could also be beneficial for the preparation of other high-performance titanosilicates.
机译：Ti的性质的全面调查物种boron-containing Ti-MWW沸石进行了。不活跃extra-framework TiO6物种可以覆盖通过沸石的路易斯酸性质约束性指标弱原子之间的“Ti (iv)”原子和原子“O”(TiO6物种)。治疗能轻易移除这些TiO6物种从as-synthesized Ti-MWW (P),紧随其后的是暴露的沸石路易斯酸度。重要的是,新Ti (OSi)的形成(3)哦物种与一个强大的路易斯酸强度,方便的修改过程。修改后的Ti-MWW沸石有改善烯烃环氧化反应的催化活性反应。在TiO4物种是一个重要的步骤因为它可以加快转型完美的Ti (OSi)(4)物种有缺陷Ti (OSi)(3)哦,物种在沸石。战略构建Ti (OSi)(3)哦物种在boron-containing也成功应用Ti-MCM-56沸石。环境可以有效地调节删除框架tetra-coordinate硼,策略也可能是有益的制备的高性能titanosilicates。

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