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