A novel ceria hollow nanosphere catalyst for low temperature NOx storage

作     者：Wenxu Liu Huiming Cao Zhongpeng Wang Chenchen Cui Liangran Gan Wei Liu Liguo Wang Wenxu Liu;Huiming Cao;Zhongpeng Wang;Chenchen Cui;Liangran Gan;Wei Liu;Liguo Wang

作者机构：School of Water Conservancy and EnvironmentUniversity of JinanJinan 250022China Shandong Provincial Eco-environment Monitoring CenterJinan 250101China 

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

年 卷 期：2022年第40卷第4期

页      面：626-635,I0004页

核心收录：

学科分类：081705[工学-工业催化] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：Project supported by the National Natural Science Foundation of China(21777055) Shandong Province Key Research and Development Plan(2019GSF109116,2018GGX102032) Natural Science Foundation of Shandong Province(ZR2020MB120,ZR2018LB026) 

主　　题：Ceria Nanosphere NO_(x)storage Low temperature DRIFTS Rare earths 

摘      要：In this work,a highly active CeO_(2) catalyst with hollow nanosphere morphology for low temperature NO_(x) storage was prepared by a surfactant-assisted solvothermal *** physicochemical properties of ceria samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),N_(2) adsorption–desorption,H_(2)-temperature programmed reduction(H_(2)-TPR),X-ray photoelectron spectroscopy(XPS)and in situ diffused reflectance infrared Fourier transform spectroscopy(DRIFTS).The as-prepared CeO_(2) nanosphere possesses excellent NO oxidation capacity,smaller mesopores,better reducibility and more surface Ce^(3+)*** with CeO_(2) with nanorod and nanoparticle morphologies,CeO_(2) nanosphere shows better intrinsic low temperature NO_(x) trapping performance,with a wide operating temperature window(150–300℃),high NO_(x) adsorption capacity(NAC,640–745μmol/g)and high NO_(x) storage capacity(NSC,250–350μmol/g).Two reaction pathways are speculated for NO_(x) adsorption on CeO_(2) nanosphere,including“nitrate routeand“nitrite route.The thermally unstable surface nitrites formed on the CeO_(2) nanosphere allow ceria to release more NO_(x) during the desorption *** present work provides a new ceria morphology for NO_(x) traps,which may become a potential excellent NO_(x) storage material.