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.
作者
阮宏程
张雪妮
黄丹
杨俊
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)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
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)。
关键词
碳烟颗粒
银基催化剂
双金属协同
制备方法
soot
silver-based catalyst
bimetallic synergism
synthesis method
