Abstract
In this study, CeZr0.5TiaOx (with a = 0, 1, 2, 5, 10) catalysts were prepared by a stepwise precipitation approach for the selective catalytic reduction of NOx with NH3. When Ti was added, all of the Ce-Zr-Ti oxide catalysts showed much better catalytic performances than the CeZr0.5Ox. Particularly, the CeZr0.5Ti2Ox catalyst showed excellent activity for broad temperature range under high space velocity condition. Through the control of pH value and precipitation time during preparation, the function of the CeZr0.5Ti2Ox catalyst could be controlled and the structure with highly dispersed CeO2 (with redox functions) on the surface of ZrO2-TiO2 (with acidic functions) could be obtained. Characterizations revealed that the superior catalytic performance of the catalyst is associated with its outstanding redox properties and adsorption/activation functions for the reactants.
Highlights
NOx in the atmosphere plays critical roles in the formation of severe air pollution problems, such as haze, acid rain, and photochemical smog
Selective catalytic reduction of NOx with NH3 (NH3 -SCR) has been widely applied for the removal of NOx generated from stationary sources for many years, and it has been used for the control of NOx emission from diesel vehicles [2,4]
Vanadium-based catalyst, with excellent SO2 resistance, is the most widely used NH3 -SCR catalyst for NOx emission control from power plants, and it was applied on diesel vehicles as the first generation of SCR catalyst [4]
Summary
NOx (mainly NO and NO2 ) in the atmosphere plays critical roles in the formation of severe air pollution problems, such as haze, acid rain, and photochemical smog. Vanadium-based catalyst (especially V2 O5 -WO3 /TiO2 ), with excellent SO2 resistance, is the most widely used NH3 -SCR catalyst for NOx emission control from power plants, and it was applied on diesel vehicles as the first generation of SCR catalyst [4]. This catalyst system still has some problems, including the toxicity of active V2 O5 , narrow temperature window, and low thermal stability [2]. -SCR reaction, bothboth redox functions andand acidic functions of the catalyst areare needed. This obtained catalyst showed superior catalytic performance for NH3 -SCR. for NH3SCR
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