Preparation of MnOδ Catalysts and Their Catalytic Performance for Combustion of Diesel Exhaust Soot Particles
Based on the excellent redox performance of manganese oxide(MnOx)catalysts,a series of layered MnOδ catalysts were prepared by hydrothermal method in this paper.The physicochemical properties of as-prepared catalysts were characterized by XRD,Raman,SEM,TEM,N2 adsorption-desorption,H2-TPR,O2-TPD and so on.The effects of hydrothermal reaction temperature,calcination temperature,and raw material composition on the crystal structure,morphology,and redox performance of the catalyst were studied.In addition,the as-prepared catalysts were applied in catalytic combustion of diesel exhaust soot particles.The results showed that the MnOδ-t12 catalyst exhibits the best catalytic activity when the hydrothermal reaction time was 12 h,the calcination temperature was 550℃,and the presence of KOH and K2CO3 in the raw materials.The corresponding temperature values of T10,T50 and T90 for soot combustion are 274,321 and 354℃,respectively.
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