Low-temperature NH_(3)-SCR of NO_(x) over MnCeO_(x)/TiO_(2) catalyst:Enhanced activity and SO_(2) tolerance by modifying TiO_(2) with Al_(2)O_(3)

作     者：Gang Li Dongsen Mao Mengxi Chao Gehua Li Jun Yu Xiaoming Guo Gang Li;Dongsen Mao;Mengxi Chao;Gehua Li;Jun Yu;Xiaoming Guo

作者机构：School of Chemical and Environmental EngineeringShanghai Institute of TechnologyShanghai 201418China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2021年第39卷第7期

页      面：805-816,I0002页

核心收录：

学科分类：081705[工学-工业催化] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070602[理学-大气物理学与大气环境] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0706[理学-大气科学] 

基　　金：Project supported by the Alliance Project of Shanghai City in China(LM201641) 

主　　题：Low-temperature NH_(3)-SCR MnCeO_(x)/TiO_(2)catalyst TiO_(2)-Al_(2)O_(3)mixed oxide SO_(2)tolerance Rare earths 

摘      要：A series of TiO_(2)-Al_(2)O_(3) composites with Al/Ti molar ratios of 0.1,0.2,and 0.4 were synthesized by a coprecipitation method and used as supports to prepare supported MnCeO_(x) catalysts by an impregnation *** physico-chemical properties of the samples were extensively characterized by N_(2) physisorption,X-ray diffraction,Raman spectroscopy,scanning electron micro scopy and energy-dispersive Xray spectroscopy element mapping,X-ray photoelectron spectroscopy,H_(2)-temperature programmed reduction,ammonia temperature programmed desorption,and in-situ diffuse reflectance infrared Fourier transform *** catalytic activity and resistance to water vapor and SO_(2) of the asprepared catalysts for the SCR of NO_(x) with NH_(3) were evaluated at 50-250℃ and GHSV of 80000 mL/(gcat·h).The results reveal that MnCeO_(x)/TiO_(2)-Al_(2)O_(3) exhibits higher activity and better SO_(2) tolerance than MnCeO_(x)/TiO_(2).Combining with the characterization results,the enhanced activity and SO_(2) tolerance of MnCeO_(x)/TiO_(2)-Al_(2)O_(3) can be mainly attributed to higher relative concentrations of Mn4+and chemisorbed oxygen species,stronger reducibility,and larger adsorption capacity for NH_(3) and NO,which originate from the larger specific surface area and pore volume,higher dispersion of Mn and Ce species compared with MnCeO_(x)/TiO_(2).Moreover,in situ DRIFTS was used to investigate the reaction mechanism,and the results indicate that the NH_(3)-SCR reaction over MnCeO_(x)/TiO_(2) and MnCeO_(x)/TiO_(2)-Al_(2)O_(3) takes place by both the E-R and L-H mechanisms.