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Hierarchical Ru-Ce/H-ZSM-5 catalysts for the catalytic oxidation of chlorobenzene: Structure-activity relationship and chlorine poisoning resistance
Surfaces and Interfaces ( IF 6.2 ) Pub Date : 2022-09-11 , DOI: 10.1016/j.surfin.2022.102320
Weiquan Li, Die Hu, Ke Yin, Chenglong Yu, Bichun Huang

A series of hierarchical Ru-Ce/H-ZSM-5 were designed and synthesized using the sol-gel method, and they were applied as catalysts for the catalytic combustion of chlorobenzene. The pore diameter of the catalyst was adjusted using an amount of sodium alginate (SA). Among all of the catalysts synthesized, the 0.8 wt.%Ru-10 wt.%Ce/H-ZSM-5 catalyst with a crystallization recipe of 1SiO2: 0.02Al2O3: 0.15TPAOH: 0.04SA: 40H2O (named RCZA-0.04) exhibited the optimal catalytic activity, with the 90% conversion of chlorobenzene at 247 °C. In addition, the RCZA-0.04 catalyst maintained superb stability during a long-term reaction at 325 °C. The results of characterizations demonstrated that RCZA-0.04 possessed the largest mesoporous volume, which reduced the diffusion resistance of chlorobenzene and increased the dispersion of the active components, thereby enhancing the catalytic activities. Moreover, the RCZA-0.04 catalyst possessed a low Brønsted/Lewis ratio, which was conducive to the adsorption of chlorobenzene and the cleavage of the Csingle bondCl bond.



中文翻译:

用于氯苯催化氧化的分级Ru-Ce/H-ZSM-5催化剂:构效关系和抗氯中毒

采用溶胶-凝胶法设计合成了一系列分级的Ru-Ce/H-ZSM-5,并将它们用作催化氯苯燃烧的催化剂。使用一定量的海藻酸钠(SA)调节催化剂的孔径。在所有合成的催化剂中,0.8 wt.%Ru-10 wt.%Ce/H-ZSM-5催化剂的结晶配方为1SiO 2 : 0.02Al 2 O 3 : 0.15TPAOH: 0.04SA: 40H 2O(命名为RCZA-0.04)表现出最佳的催化活性,在247°C时氯苯的转化率为90%。此外,RCZA-0.04 催化剂在 325 °C 的长期反应过程中保持了极好的稳定性。表征结果表明,RCZA-0.04具有最大的介孔体积,降低了氯苯的扩散阻力,增加了活性组分的分散性,从而提高了催化活性。此外,RCZA-0.04催化剂具有较低的Brønsted/Lewis比,有利于氯苯的吸附和CCl单键键的断裂。

更新日期:2022-09-11
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