Tang Guoqiang, Li Yichuan, Yang Zhaosheng, Wang Yu, Li Guangyun, Wang Yilou, Chai Yong-Ming, Liu Chenguang
State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China.
ACS Omega. 2023 May 15;8(21):19099-19108. doi: 10.1021/acsomega.3c02538. eCollection 2023 May 30.
Titanium silica (TS-1) membrane catalysts grown on the surfaces of spherical substrates can both exploit the high catalytic performance and facilitate their separation from products after the reaction. In this work, a simple static crystallization method was used to perform the in situ construction of a TS-1 membrane on the surfaces of micron-sized spherical carriers. The shortcomings of the TS-1 membrane under static crystallization conditions were overcome by in situ dynamic crystallization, and the effect of rotation speed on the formation of the molecular sieve membrane was investigated. The results showed that the molecular sieve membrane was smooth and homogeneous, with a higher synthesis efficiency at a slow rotational speed. The micron TS-1 spherical membrane catalytic chloropropene epoxidation reaction was investigated in a fixed bed, and the conversion of hydrogen peroxide and selectivity of epichlorohydrin reached 99.4 and 96.8%, respectively. After being reused twice, the catalyst still maintained a stable catalytic performance.
生长在球形载体表面的钛硅（TS-1）膜催化剂既可以利用其高催化性能，又便于反应后与产物分离。在本工作中，采用一种简单的静态结晶方法在微米级球形载体表面原位构建TS-1膜。通过原位动态结晶克服了静态结晶条件下TS-1膜的缺点，并研究了转速对分子筛膜形成的影响。结果表明，分子筛膜光滑均匀，在缓慢转速下具有较高的合成效率。在固定床中研究了微米级TS-1球形膜催化氯丙烯环氧化反应，过氧化氢转化率和环氧氯丙烷选择性分别达到99.4%和96.8%。重复使用两次后，催化剂仍保持稳定的催化性能。
