催化作用
选择性催化还原
氧气
化学
氧化物
密度泛函理论
氮氧化物
无机化学
过氧化物
物理化学
计算化学
有机化学
燃烧
作者
Maofan Li,Meng Gao,Guo‐Zhong He,Yunbo Yu,Hong He
标识
DOI:10.1021/acs.est.2c08608
摘要
CeO2 has attracted much attention in the field of selective catalytic reduction of NO with NH3 (NH3-SCR). However, poor low-temperature activity and a narrow operation window restrict the industrial application of Ce-based oxide catalysts. Herein, the low-temperature NH3-SCR activity of Ce-based oxide catalysts was dramatically improved by Mn doping, and the mechanism was elucidated at the atomic level by experimental measurements and density functional theory calculations. We found that the addition of Mn significantly promoted the formation of surface oxygen vacancies. The oxygen vacancies easily captured O2 in air and formed active oxygen species (superoxide and peroxide) on the surface. The surface active oxygen species efficiently oxidized NO into NO2 and then facilitated the "fast SCR" reaction. This study provides atomic-level insights into the promotion of the NH3-SCR activity over Mn-Ce composite oxides and is beneficial for the development of low-temperature Ce-based catalysts.
科研通智能强力驱动
Strongly Powered by AbleSci AI