B-TS-1分子筛的合成及其催化氧化性能

Synthesis and Catalytic Oxidation Performance of B-TS-1

通过将杂原子B引入钛硅-1(TS-1)分子筛对其进行改性,并研究其催化氧化性能。结果发现,B-TS-1明显延长了环己酮氨肟化反应运行寿命。结合氨肟化体系催化剂失活主要原因以及反应体系H_2O_2反应路径,分析表明,H_2O_2是控制TS-1/H_2O_2氨肟化体系副反应发生的关键,并且有机副产物是导致催化剂堵孔失活的重要原因。本文提出B-TS-1能有效控制体系H_2O_2残留,从而进一步抑制副反应发生与积碳生成以延长催化剂寿命。结合Al-TS-1的催化特性,发现同时引入适量B、Al的B/Al-TS-1具有进一步提高环己酮肟化反应稳定性的作用。

In this paper, boron-modified titanium silicalite-1 （B-TS-1） was synthesized, and its catalytic performance was studied. B-TS-1 improved the stability of cyclohexanone ammoximation. Combined with the root of deactivation of the catalyst and H2O2 reaction behavior in the liquid-phase ammoximation process, analysis showed that H2O2 is the key to control the side reactions of the cyclohexanone ammoximation system to form organic byproducts, and these byproducts result in the deactivation of catalyst because they block pores. It is concluded that B-TS-1 could effectively decrease the residual H2O2 to suppress the side reactions and prolong the catalyst lifetime in cyclohexanone ammoximation. Simultaneous introduction of appropriate amounts of B and Al to form B/Al-TS-1 resulted in a material that further improved the stability of cyclohexanone ammoximation.