Preparation and performance of CeO2-ZrO2/MnOx-based deNOx catalysts by sol-gel method
In order to improve the low-temperature denitrification performance of CeO2-ZrO2-based denitrification catalysts,a series of CeO2-ZrO2/MnOx-based deNOx catalysts were prepared by sol-gel and sol-gel+impregnation methods.The catalysts were characterized by XRD,XPS,N2 adsorption-desorption,NH3-TPD,H2-TPR,SEM/EDS,etc.The denitrification performance of the catalysts was evaluated.The results showed that the CZM-0.2 catalysts prepared by sol-gel method exhibited the best low-temperature deNOx performance in the temperature range of 100-350 ℃ with a gas hourly space velocity of 220 000 h-1.The excellent low-temperature deNOx performance of CZM-0.2 catalyst was mainly related to its better dispersion of Mn,higher Mn4+content,stronger low-temperature reduction performance(gradual reduction of MnOx),and more weak acid sites.
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