Toluene catalytic combustion over copper modified Mn0.5Ce0.5 Ox solid solution sponge-like structures
Toluene catalytic combustion over copper modified Mn0.5Ce0.5 Ox solid solution sponge-like structures
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铜改性Mn0.5Ce0.5 O-x固溶海绵状结构的甲苯催化燃烧
DOI：
10.1016/j.apcata.2017.04.010
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发表时间：
2017-06-25
影响因子：
5.5
通讯作者：
Li, Junhua
中科院分区：
文献类型：
--
作者：
Hu, Fangyun;Chen, Jianjun;Li, Junhua
催化燃烧是一种有效的去除挥发性有机物的方法，高活性催化剂是该方法的关键。本文采用表面活性剂改性共沉淀法制备了一系列海绵状三元复合氧化物。采用BET、XRD、拉曼、TEM、EDS、H-2-TPR、XPS等技术对材料的结构和性能进行了表征。结果表明，Cu含量对催化剂的甲苯燃烧活性有显著影响. CMC-2（Cu：Mn：Ce = 1：5：5）在空气气氛下表现出最好的催化性能，在240 ℃时甲苯完全转化。表征结果表明，适量的Cu有利于高度可还原的Mn 4+掺入二氧化铈晶格中，形成海绵状MnCeOx固溶体结构。铜的这种促进作用可以改善CuOx/MnCeOx的氧化还原行为，在界面处产生大量的O-α，有利于甲苯的低温燃烧。这项工作的研究结果突出了铜在制备活性MnOx CeO 2催化剂用于VOCs燃烧的重要性。
Catalytic combustion is a well-established way to remove the pollution of volatile organic compounds (VOCs), and the highly active catalyst is the key issue of this process. Herein, a series of sponge-like ternary mixed oxide were prepared by a facile surfactant modified coprecipitation approach. The structure properties were characterized via BET, XRD, Raman, TEM, EDS, H-2-TPR, and XPS techniques. It was found that the Cu content significantly influences the catalytic activity in toluene combustion. The CMC-2 (Cu:Mn:Ce = 1:5:5) showed the best catalytic performance under the air atmosphere, and the complete conversion of toluene was achieved at 240 C-omicron. The characterization reveals that a proper amount of Cu facilitates the incorporation of highly reducible Mn4+ into ceria lattice to form sponge-like MnCeOx solid solution structures. Such promotion effect of copper can improve the redox behavior, produce large amounts of O-alpha at the interface of CuOx/MnCeOx both of which benefit the toluene combustion at low temperature. The findings of this work highlight the importance of Cu in preparation of the active MnOx CeO2 catalyst for VOcs combustion.