Getting insights into gas-phase sulfation effect on catalytic performance of praseodymium oxides in NH_(3)-SCR of NO  

作　　者：Yandi Cai Peng Yang Qinglong Liu Kaili Ma Wenxin Ma Wang Song Qiuhui Qian Fei Gao Wei Tan Lin Dong 

机构地区：[1]State Key Laboratory of Pollution Control and Resource Reuse,School of Environment,Jiangsu Key Laboratory of Vehicle Emissions Control,Center of Modern Analysis,Key Laboratory of Mesoscopic Chemistry of MOE,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,China [2]Analysis and Testing Center,Southeast University,Nanjing 211189,China [3]National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology,School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China

出　　处：《Journal of Rare Earths》2023年第6期952-958,I0005,共8页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(21972063);the Natural Science Foundation of Jiangsu Province(BK20200012).

摘　　要：Sulfation treatment has been widely used to promote the catalytic performance of ceria(CeO_(2))based catalysts for the selective catalytic reduction of NO by NH_(3)(NH_(3)-SCR of NO).Praseodymium oxide(PrO_(x)),another commonly used rare earth material with similar structural properties as CeO_(2),also shows satistactory redox properties due to the facile redox cycle of Pr^(3+)■Pr^(4+).In this work,gas phase sulfation treatment with varied duration was performed on PrO_(x) at 200℃,and the NH_(3)-SCR activity of sulfated PrO_(x) was evaluated.Based on the results of systematic characterizations(e.g.,N_(2)-physisorption,NH_(3) oxidation,NO oxidation,in situ diffuse Fourier transform infrared spectroscopy),it is revealed that the catalytic performance of sulfated PrO_(x)is highly dependent on the sulfation time(or the amount of sulfate species deposited on PrO_(x)),which has a significant impact on the competitive reaction between NH_(3) oxidation and NH_(3)-SCR of NO,thus determining the NH_(3)-SCR activity of PrO_(x).This work provides new insight into tuning the interaction between PrO_(x) surface and reactants(NO,NH_(3))via sulfation treatment,which cam guide the design and application of PrO_(x)based catalysts for NH_(3)-SCR of NO in the future.

关 键 词：NH_(3)-SCR Praseodymium oxides Sulfation treatment Surface acidity NH_(3)oxidation Rare earths 

分 类 号：X701[环境科学与工程—环境工程] TQ426[化学工程]