MCM-41 supported nano-sized CuO-CeO_2 for catalytic combustion of chlorobenzene 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Journal of Rare Earths
年/卷/期
2020 / 38 / 09
页码
933-940
作者单位
Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process,Shaoxing University;Quality and Technical Supervision Inspection Center of Yongkang;
作者
Jie Zheng;Zhu Chen;Jianfei Fang;Zhuo Wang;Shufeng Zuo;
摘要
In this paper,MCM-41 was synthesized by a soft template technique and MCM-41 supported CuO-CeO_2 nano-sized catalysts with different Cu/Ce molar ratios were prepared by a deposition-precipitation method.N_2 adsorption,HRTEM-EDS,H_2-TPR,XPS characterization,as well as catalytic activity and durability tests for the catalytic combustion of chlorobenzene(CB) were conducted to explore the relationship between the structure and catalytic performance of the catalysts.It is revealed that cuCe(6:1)/MCM-41 has the highest activity and can completely catalyze the degradation of CB at 260℃.The reasons for the high activity of the catalysts are as follows:MCM-41,a type of mesoporous material which has large pore size and large specific surface area,is suitable as a catalyst carrier.The average diameter of nano-sized CuO and CeO_2 particles is about 3-5 nm and adding CeO_2 improves the dispersion of active component CuO,which are highly and evenly dispersed on the surface of MCM-41.Characterization results also explain why MCM-41 supported CuO-CeO_2 with appropriate proportion can highly enhance the catalytic activity.The reason is that CeO_2 acting as an oxygen-rich material can improve the mobility of oxygen species through continuous redox between Ce~(4+)and Ce~(3+),and improve the catalytic performance of CuO for CB combustion.Besides,CuCe(6:1)/MCM-41 also displays good durability for CB combustion,both in the humid condition and in the presence of benzene,making it a promising catalytic material for the elimination of chlorinated VOCs.
机翻摘要
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关键词/主题词
CuO-CeO_2;MCM-41;Nano-sized;Chlorobenzene;Catalytic combustion;Rare earths;
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