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首页> 外文期刊>New Journal of Chemistry >Improving the performance of TS-1 catalysts for continuous cyclohexanone ammoximation through controlment of active species distribution
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Improving the performance of TS-1 catalysts for continuous cyclohexanone ammoximation through controlment of active species distribution

机译:通过控制活性物种分布来提高TS-1催化剂连续环己酮氨化反应的性能

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摘要

The active species distribution of zeolites significantly influences the catalytic performance. In this paper, titanium silicalite-1 (TS-1) was synthesized from silica sol, TiCl3 and NH3 with tetrapropyl ammonium bromide (TPAB) as the template agent. Modification with ethanolamine altered the distribution of Ti species in TS-1 particles. Some large voids as 50 x 70 nm and 70 x 110 nm existed in the inner part of modified TS-1 crystals and were responsible for improved diffusion properties and accessibility to active sites. The modified TS-1 was examined in continuous cyclohexanone ammoximation. A high conversion of cyclohexanone (98%) and oxime selectivity (100%) was still maintained after the test reaction had been carried out up to 410 h. The modified TS-1 is able to serve as a stable catalyst for continuous cyclohexanone ammoximation.
机译:沸石的活性物种分布显着影响催化性能。本文以硅溶胶,TiCl3和NH3为原料,以四丙基溴化铵(TPAB)为模板剂,合成了钛硅沸石-1(TS-1)。乙醇胺的改性改变了TS-1颗粒中Ti的分布。改性的TS-1晶体的内部存在一些较大的空隙,如50 x 70 nm和70 x 110 nm,这些空隙有助于改善扩散性能和接近活性位点。在连续的环己酮氨氧化反应中检查了修饰的TS-1。在测试反应进行至410小时后,仍保持了较高的环己酮转化率(98%)和肟选择性(100%)。改性的TS-1可以用作连续环己酮氨氧化的稳定催化剂。

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