制备方法对碳烟催化中Ag-Cs协同体系影响研究  

Study on the effect of preparation method on Ag-Cs synergistic system in soot oxidation catalysis

作　　者：阮宏程 张雪妮 黄丹 杨俊[1,2] 李鸿鹄 庄龚祖 白泉 郭利民 RUAN Hong-cheng;ZHANG Xue-ni;HUANG Dan;YANG Jun;LI Hong-hu;ZHUANG Gong-zu;BAI Quan;GUO Li-min(School of Information Engineering,Zhongnan University of Economics and Law,Wuhan 430073,China;Institute for Environmental Management and Policy,Zhongnan University of Economics and Law,Wuhan 430073,China;School of Environmental Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]中南财经政法大学信息工程学院,湖北武汉430073 [2]中南财经政法大学,环境管理与政策研究所,湖北武汉430073 [3]华中科技大学环境科学与工程学院,湖北武汉430074

出　　处：《中国环境科学》2024年第7期3637-3645,共9页China Environmental Science

基　　金：中南财经政法大学中央高校基本科研业务费专项资金(113/31513111314)。

摘　　要：采用离子交换法和浸渍法分别合成了Ag-Cs/ZSM-5(E)和Ag-Cs/ZSM-5(D)双金属催化剂.利用X射线衍射光谱(XRD)、X射线光电子能谱(XPS)、透射电镜(TEM)等手段表征材料的物理、化学状态.通过程序升温氧化(TPO)测试催化剂活性,发现在氧气气氛下,Ag-Cs/ZSM-5(E)和Ag-Cs/ZSM-5(D)双金属催化剂催化活性较Ag/ZSM-5有着非常明显的提升,T50从Ag/ZSM-5的546℃分别降低至Ag-Cs/ZSM-5(E)的430℃和Ag-Cs/ZSM-5(D)的464.℃同时,Ag-Cs/ZSM-5(E)比Ag-Cs/ZSM-5(D)表现出更佳的催化活性和稳定性.研究结果证实了Ag-Cs双金属的协同作用,以及ZSM-5载体上路易斯酸性位点Cs在双金属协同中的关键作用.Bimetallic catalysts Ag-Cs/ZSM-5(E)and Ag-Cs/ZSM-5(D)were synthesized by ion-exchange and impregnation method.The physical and chemical properties of the catalysts were characterized by X-ray diffraction spectroscopy(XRD),X-ray photoelectron spectroscopy(XPS),transmission electron microscopy(TEM),and so on.The catalyst activities were tested by temperature-programmed oxidation(TPO),and the catalytic activities of the bimetallic catalysts Ag-Cs/ZSM-5(E)and Ag-Cs/ZSM-5(D)were found to be significantly enhanced compared with those of Ag/ZSM-5under oxygen atmosphere,the T50 values decreased from 546 for Ag/ZSM℃-5 to 430 for Ag℃-Cs/ZSM-5(E)and 464 for Ag℃-Cs/ZSM-5(D),respectively.Meanwhile,Ag-Cs/ZSM-5(E)exhibited better catalytic activity and stability than Ag-Cs/ZSM-5(D).The results confirmed the synergistic effect of Ag-Cs bimetallic and the key role of Lewis acidic site Cs on ZSM-5 support in the bimetallic synergism.

关 键 词：碳烟颗粒 银基催化剂 双金属协同 制备方法 

分 类 号：X701[环境科学与工程—环境工程]