Perspective about gasoline soot combustion over ceria catalysts:A close look into the"active oxygen"enigma  

作　　者：Zilin Tu Gongde Wu Changlong Zheng Xiaodong Wu Jie Wan Shuang Liu 

机构地区：[1]School of Materials Science and Engineering,Ocean University of China,Qingdao,266100,China [2]Energy Research Institute,Nanjing Institute of Technology,Nanjing,211167,China [3]Key Laboratory of Advanced Materials of Ministry of Education of China,School of Materials Science and Engineering,Tsinghua University,Beijing,100084,China

出　　处：《Journal of Rare Earths》2025年第4期641-659,I0001,共20页稀土学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(22076176,22276106);the Natural Science Foundation of Shandong Province(ZR2021YQ14);the Innovation Ability Improvement Project for Technology-based Small-and Medium-sized Enterprises of Shandong Province(2022TSGC1345);Jiangsu Province Science and Technology Plan Special Fund(BZ2022053);Key Research and Development Program of Anhui Province(202104g01020006);the Fundamental Research Funds for the Central Universities(202141008)。

摘　　要：Catalyzed gasoline particulate filters(cGPFs)are being developed to enable compliance with the particulate number limits for passenger cars equipped with gasoline direct injection(GDI)engines in China and Europe,It is appealing to build catalysts with ceria—an irreplaceable"reducible"component in three-way converters—to help eliminate the soot particles trapped in cGPFs via O_(2)-assisted combustion.While research aiming at understanding how these recipes function has continued for more than two decades,a universal model elucidating the roles of different"active oxygen"species is yet to be realized.In this perspective,by critically assessing the reported data about gasoline soot catalytic combustion over ceria catalysts,it is suggested that ceria ignites soot through contributing its lattice oxygen,giving rise to a"hot ring"region at the periphery of soot-catalyst interface.During the"re-oxidation"semi-cycles,electrophilic superoxides and/or peroxides(O_(x)^(n-))are produced at the Ce^(3+)and oxygen vacancy sites enriched in this collar-like region,and then work as key reactive phases for soot deep oxidation.Based on this"O_(x)^(n-)assisted"Mars-van Krevelen mechanism,several guidelines for ceria catalyst designing are proposed,ending with a summary about where future opportunities and challenges may lie in developing efficient and practical cGPF catalysts.

关 键 词：Gasoline particulate filter Soot combustion Ceria catalysts Rare earths Reaction mechanism Catalyst design 

分 类 号：O643.36[理学—物理化学]