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Easily recoverable micron-sized silica-walled TS-1 colloidosomes: Preparation and application as liquid-phase alkene epoxidation catalysts
Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2017-09-05 , DOI: 10.1016/j.apcata.2017.09.001
Guojun Lv , Fumin Wang , Xubin Zhang

Ultrafine hierarchical TS-1 zeolite (<300 nm) generally expresses eminent catalytic activity for liquid-phase alkene epoxidation, but encounters serious separation difficulties. Micron-sized silica-walled TS-1 colloidosomes, which were synthesized via an interfacial sol-gel method, can effectively resolve fine TS-1 zeolite separation problems. The interfacial sol-gel process involves construction of a stable W/O Pickering emulsion stabilized by fine TS-1 particles and alkali-catalyzed hydrolysis of silica precursor methyl-trimethoxysilane at the oil-water interface. The successful preparation of TS-1 colloidosome was verified by Scanning electron microscopy (SEM) and Energy dispersive X-ray spectroscopy (EDS). The prepared TS-1 colloidosome dimension is tailorable according to water-to-oil volume ratio (Rw/o) and ratio of TS-1 wt to oil volume (Rs/o). On the same time, X-ray diffraction patterns and UV–vis spectra disclosed that the interfacial sol-gel process had no effect on the MFI structure of hierarchical TS-1 particles. The catalytic results showed that the prepared TS-1 colloidosome was a very active and stable catalyst for liquid-phase alkene epoxidation reactions.



中文翻译:

易于回收的微米级二氧化硅壁TS-1胶体:液相烯烃环氧化催化剂的制备和应用

通常,超细分层TS-1沸石(<300 nm)对液相烯烃环氧化反应具有显着的催化活性,但遇到严重的分离困难。通过界面溶胶-凝胶法合成的微米级二氧化硅壁TS-1胶体可有效解决精细的TS-1沸石分离问题。界面溶胶-凝胶法涉及稳定的W / O Pickering乳液的构建,该乳液由细的TS-1颗粒稳定,并在油水界面上对二氧化硅前体甲基-三甲氧基硅烷进行碱催化水解。TS-1胶体的成功制备已通过扫描电子显微镜(SEM)和能量色散X射线光谱(EDS)进行了验证。制备的TS-1胶体尺寸可根据水油体积比(R w / o)和TS-1重量与机油体积之比(R s / o)。同时,X射线衍射图谱和UV-vis光谱表明,界面溶胶-凝胶过程对分级TS-1颗粒的MFI结构没有影响。催化结果表明,所制备的TS-1胶体是非常有效且稳定的液相烯烃环氧化反应催化剂。

更新日期:2017-09-05
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