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Hollow core-shell structured TS-1@S-1 as an efficient catalyst for alkene epoxidation

机译:中空核 - 壳结构TS-1 @ S-1作为烯烃环氧化的有效催化剂

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摘要

Hollow core-shell structured TS-1@S-1 zeolite (HCS-TS) was prepared successfully for the first time, which exhibited excellent activity in the epoxidation of alkenes. Combining TEM, UV-vis, UV-Raman, pyridine-IR, solid-state MAS NMR, XPS and so on characterization, the improvement in the catalytic performance of hollow core-shell structured TS-1@S-1 zeolite was credited to the newly formed superior active sites: defective Ti(OSi)(3)(OH) species in HCS-TS and six-coordinated titanium active species in uncalcined HCS-TS (HCS-TSP). Interestingly, these two different titanium active species in the samples could be constructed through calcination or not in the same synthesis process. A possible formation mechanism was investigated in detail; it indicated that the hollowing treatment of TS-1 in the first step was conducive to the construction of the new superior active sites in the samples, and there was a synergistic effect on the formation of these active sites between TPAOH and TEOS in the second step of the synthesis process. This strategy is feasible to enhance the catalytic performance of TS-1, and is suitable for the synthesis of TS-1 on an industrial scale.
机译:中空核 - 壳结构的TS-1 @ S-1沸石(HCS-TS)首次制备,其在烯烃的环氧中表现出优异的活性。结合TEM,UV-Vis,UV-Raman,吡啶-RIR,固态MAS NMR,XP等表征,中空核心 - 壳结构TS-1催化性能的改善归功于S-1沸石新形成的优异活性位点:在未均合并HCS-TS(HCS-TSP)中HCS-TS和六种协调钛活性物质中的Ti(OSI)(3)(OH)物种有缺陷(OSI)(3)(OH)物种。有趣的是,样品中的这两个不同的钛活性物质可以通过煅烧或不在相同的合成过程中构建。详细研究了一种可能的形成机制;它表明,第一步中的TS-1的空心处理有利于在样品中的新型活性位点的构建,并且对第二步中TPAOH和TEO之间的这些活性位点的形成存在协同作用合成过程。该策略可行,可以增强TS-1的催化性能,适用于在工业规模上合成TS-1。

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    《RSC Advances》 |2019年第65期|共8页
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  • 正文语种 eng
  • 中图分类 化学;
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