Sm-MnO_(x)catalysts for low-temperature selective catalytic reduction of NO_(x)with NH_(3):Effect of precipitation agent  

作　　者：Junbin Ding Xinwei Yang Aiyong Wang Can Yang Yanglong Guo Yun Guo Li Wang Wangcheng Zhan 

机构地区：[1]Key Laboratory for Advanced Materials and Research Institute of Industrial Catalysis,School of Chemistry&Molecular Engineering,East China University of Science and Technology,Shanghai 200237,China [2]Hudong Heavy Machinery Co.,Ltd.,Shanghai 200237,China [3]International Joint Laboratory of Catalytic Chemistry,Department of Chemistry,Research Center of Nano Science and Technology,College of Sciences,Shanghai University,Shanghai 200444,China [4]State Key Laboratory of Photocatalysis on Energy and Environment,College of Chemistry,Fuzhou University,Fuzhou 350108,China

出　　处：《Journal of Rare Earths》2022年第8期1199-1210,共12页稀土学报（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(2016YFC0204300);the National Natural Science Foundation of China(21577034,21922602,22076047,U1905214);Shanghai Risingstar Program(20QB1400400);Shanghai Science and Technology Innovation Action Plan(20dz1204200);Fundamental Research Funds for the Central Universities。

摘　　要：A series of Sm-Mn mixed oxide catalysts were prepared via precipitation using various precipitants,namely Na_(2)CO_(3)(NH_(4))_(2)CO_(3),and NH_(3)·H_(2)O,and evaluated for the selective catalytic reduction(SCR)of NO_(x)with NH_(3)at low temperatures.Various characterisation techniques were used to determine the physicochemical properties of the catalysts,and it is found that their catalytic performance is greatly influenced by the nature of the precipitation agent used.It is found that Sm_(0.1)Mn-Na_(2)CO_(3)and Sm_(0.1)Mn-(NH_(4))_(2)CO_(3)exhibit superior catalytic performance in the SCR reaction to that of Sm_(0.1)Mn-NH_(3)·H_(2)O due to an abundance of surface acid sites,high surface concentration of Mn^(4+),and high NO oxidation capacity.From in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFT)analysis,we conclude that the Sm-Mn catalysts follow both Eley-Rideal and Langmuir-Hinshelwood mechanisms,and that the Eley-Rideal mechanism is dominant at elevated temperatures.

关 键 词：Effect of precipitant Mn-based catalyst Selective catalytic reduction Rare earths 

分 类 号：TQ426[化学工程] X701[环境科学与工程—环境工程]