SCR-C3 H6 denitrification performance of Cu-modified MIL-100(Fe)catalysts
Selective catalytic reduction of nitrogen oxides by hydrocarbons(SCR-HC)is a promising denitrification method.The efficient redox ability of the catalyst is a key factor to influence its activity.A novel metallic organic framework,MIL-100(Fe),was prepared by hydrothermal method,and mCu-MIL-100(Fe)catalysts with different copper contents were synthesized by ultrasonic impregnation,and the performance of the SCR of NO with C3H6 was experimentally investigated in a fixed-bed microreactor.The results showed that the catalytic activity of MIL-100(Fe)was improved by the introduction of Cu.The NO conversion rate of 2.3Cu-MIL-100(Fe)was 100%at 275℃and maintained above 85%with the N2 selectivity higher than 90%in the range of 275-400℃.It also has good ability to resist SO2.The microstructure and physicochemical properties of the catalysts were characterized by various techniques,and the reaction mechanism was further discussed.The N2 adsorption-desorption results showed that the addition of an appropriate amount of Cu increased the specific surface area of the catalyst and enhanced the adsorption of the reaction gases on the catalyst surface.XPS results proved that the addition of Cu increased the number of oxygen vacancies on the catalyst surface.There was a synergistic effect and electron transfer between Cu and Fe.The H2-TPR curve indicated that Cu shifted the reduction characteristic peak of the catalyst towards low temperature,enhancing the catalyst's reduction ability.
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