The Poisoning Effect of Na Doping over Mn-Ce/TiO2Catalyst for Low-Temperature Selective Catalytic Reduction of NO by NH3

摘要

Sodium carbonate (Na2CO3), sodium nitrate (NaNO3), and sodium chloride (NaCl) were chosen as the precursors to prepare the Na salts deposited Mn-Ce/TiO2catalysts through an impregnation method. The influence of Na on the performance of the Mn-Ce/TiO2catalyst for low-temperature selective catalytic reduction ofNOxby NH3was investigated. Experimental results showed that Na salts had negative effects on the activity of Mn-Ce/TiO2and the precursors of Na salts also affected the catalytic activity. The precursor Na2CO3had a greater impact on the catalytic activity, while NaNO3had minimal effect. The characterization results indicated that the significant changes in physical and chemical properties of Mn-Ce/TiO2were observed after Na was doped on the catalysts. The significant decreases in surface areas and NH3adsorption amounts were observed after Na was doped on the catalysts, which could be considered as the main reasons for the deactivation of Na deposited Mn-Ce/TiO2.