Hydrothermal and sulfur aging of CeTi/CeWTi catalysts for selective catalytic reduction of NOx with NH3

作     者：Lei Chen Ding Wang Jiadao Wang Duan Weng Li Cao 

作者机构：State Key Laboratory of TribologySchool of Mechanical EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Advanced Materials of Ministry of EducationSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China 

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

年 卷 期：2019年第37卷第8期

页      面：829-836,I0002页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0708[理学-地球物理学] 0703[理学-化学] 

基　　金：Project supported by the National Natural Science Foundation of China(51775296 51375253) 

主　　题：CeWTi catalyst Crystallization Surface acidity Redox property SCR activity Rare earths 

摘      要：The CeO2-TiO2(CeTi)and CeO2/WO3-TiO2(CeWTi)catalysts were prepared by sol-gel *** asprepared catalysts were hydrothermally treated at 760℃for 48 h in air containing 10 vol%H2O to obtain the hydrothermal aged *** sulfur aged catalysts were treated at 400℃with 100 ppm SO2,10%water vapor,air balance for 48 h and *** powder X-ray diffraction(XRD)and Raman results indicate that the crystallization of hydrothermal aged catalysts is more serious than sulfur aged *** addition,tungsten species can stabilize the CeTi catalyst from grain *** to the results of in situ diffuse reflectance infrared Fourier transform spectra(DRIFTS),temperatureprogrammed desorption of ammonia(NH3-TPD),H2 temperature-programmed reduction(H2-TPR)and ammonia oxidation,the aging process leads to loss of surface area,redox properties,surface acidities and surface ceria concentration,especially for the hyd rothermal *** NH3-NO/NO2 SCR perfo rmances of sulfur aged catalysts are better than that of hydrothermal aged *** with CeTi catalyst,the addition of tungsten inhibits the crystallization of *** that more acid sites and active sites are *** is also the reason why tungsten addition improves the NH3-NO/NO2 SCR performance of CeTi catalyst.