Characterization of VmTi and KnV0.04Ti Catalysts Supported by Oxide and Their Catalytic Performances for Diesel Soot Combustion

Abstract

Abstract: Two systems of V_mTi and K_nV_0.04Ti catalysts were prepared by incipient-wet impregnation method and their catalytic performances for diesel soot combustion were investigated by using temperature-programmed oxidation(TPO) reaction. The results show that the V_0.04Ti catalyst has a good activity for diesel soot combustion(t_m=389 ℃). The addition of potassium to VO_x/ TiO₂ catalysts can apparently improve their catalytic activities for soot oxdation. And when n(K)∶n(V)∶n(Ti)=(0.04∶0.04∶1,) the catalysis activity is the best, and the temperature of soot combustion reaction is the lowest reaction temperature(t_m=343 ℃). The structural characterization results by FTIR and UV-Vis reveal that V₂O₅ formed on the surfaces of the V_mTi catalysts when m exceeded 0.04. The (K_0.04V_0.04Ti) catalyst has a highest catalytic activity. It is due to the formation of KVO₃ which has a good synergetic effect with TiO₂ support in the catalyst.

Key words: Catalyst, Soot, VO_x, TiO₂, Catalytic combustion

CLC Number:

O643

TrendMD:

LIU Jian, ZHAO Zhen, XU Chun-Ming. Characterization of V_mTi and K_nV_0.04Ti Catalysts Supported by Oxide and Their Catalytic Performances for Diesel Soot Combustion[J]. Chem. J. Chinese Universities, 2005, 26(7): 1290.

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Characterization of V_mTi and K_nV_0.04Ti Catalysts Supported by Oxide and Their Catalytic Performances for Diesel Soot Combustion

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