Unraveling the advantages of Pd/CeO_(2)single-atom catalysts in the NO+CO reaction by model catalysts
作者机构:Department of ChemistryTsinghua UniversityBeijing 100084China National Synchrotron Radiation LaboratoryUniversity of Science and Technology of ChinaHefei 230029China College of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China
出 版 物:《Nano Research》 (纳米研究(英文版))
年 卷 期:2023年第16卷第7期
页 面:8882-8892页
核心收录:
学科分类: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] 0703[理学-化学]
基 金:This work was financially supported by the National Natural Science Foundation of China(Nos.21872131,22106085,U1832218,and U1932214) the National Key Research and Development Program of China(No.2019YFA0405601)
主 题:NO+CO reaction Pd/CeO_(2) model catalysts reaction mechanisms
摘 要:Selective catalytic reduction of NO by CO is challenging in environmental catalysis but attractive owing to the advantage of simultaneous elimination of NO and ***,model catalysts consisting of Pd nanoparticles(NPs)and single-atom Pd supported on a CeO_(2)(111)film grown on Cu(111)(denoted as Pd NPs/CeO_(2)and Pd_(1)/CeO_(2),respectively)were successfully prepared and characterized by synchrotron radiation photoemission spectroscopy(SRPES)and infrared reflection absorption spectroscopy(IRAS).The NO+CO adsorption/reaction on the Pd_(1)/CeO_(2)and Pd NPs/CeO_(2)catalysts were carefully investigated using SRPES,temperature-programmed desorption(TPD),and *** is found that the reaction products on both model catalysts are in good agreement with those on real catalysts,demonstrating the good reliability of using these model catalysts to study the reaction mechanism of the NO+CO *** the Pd NPs/CeO_(2)surface,N_(2)is formed by the combination of atomic N coming from the dissociation of NO on Pd NPs at higher temperatures.N_(2)O formation occurs probably via chemisorbed NO combined with atomic N on the *** on the single-atom Pd_(1)/CeO_(2)surface,no N_(2)O is *** 100%N_(2)selectivity may stem from the formation of O-N-N-O^(*)intermediate on the *** this study,direct experimental evidence for the reaction mechanisms of the NO+CO reaction is provided,which supports the previous density functional theory(DFT)calculations.