Amphiphilic polyoxoniobate-based recoverable Pickering emulsion for effective oxidative desulfurization
Amphiphilic polyoxoniobate-based recoverable Pickering emulsion for effective oxidative desulfurization
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DOI：
10.1016/j.apcata.2023.119133
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发表时间：
2023-03
期刊：
影响因子：
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通讯作者：
Huifang Liu;Chengpeng Liu;Ni Zhen;Jing Dong;Yingnan Chi;Changwen Hu
中科院分区：
文献类型：
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作者：
Huifang Liu;Chengpeng Liu;Ni Zhen;Jing Dong;Yingnan Chi;Changwen Hu
近年来，Pickering乳液为界面催化提供了一种绿色且有效的解决方案。然而，在乳液体系中，产物的分离和催化剂的再循环依赖于耗时且耗能的离心和过滤。本文中，已经开发了一种简单的乳液辅助组装策略来制备两亲性聚氧铌酸盐（PONbs），[CnH 2n +1 N（CH 3）3] 6 KHNb 6 O 19/SiO2（Cn-Nb 6/SiO2; n = 14，16和18）。蜂窝状C16-Nb 6/SiO2复合材料不仅能在正辛烷/水体系中形成稳定的Pickering乳液，而且能在温和条件下有效催化氧化脱硫。值得注意的是，反应后，油相和乳液相自动分离：通过倾析收集干净的油，而再循环的乳液直接用于下一次运行。此外，C16-Nb 6/SiO2是高度耐用的，可以连续使用多达11个循环，其催化活性的损失可以忽略不计。
Recently, Pickering emulsions provide a green and efficient solution for interfacial catalysis. However, in an emulsion system the separation of products and the recycle of catalysts rely on time- and energy-consuming centrifugation and filtration. Herein, a straightforward emulsion assisted assembly strategy has been developed to fabricate amphiphilic polyoxoniobates (PONbs), [CnH2n+1N(CH3)3]6KHNb6O19/SiO2(Cn-Nb6/SiO2; n = 14, 16, and 18). The honeycomb-like C16-Nb6/SiO2composite not only can form stable Pickering emulsion in the n-octane/water system but also can effectively catalyze oxidative desulfurization under mild conditions. Notably, after the reaction, the oil phase and the emulsion phase were automatically separated: the clean oil was collected by decantation, while the recycled emulsion was directly used for the next run. Moreover, C16-Nb6/SiO2is highly robust and can be consecutively used for up to eleven cycles with negligible loss of its catalytic activity.