High selectivity of H_(2)O_(2)activation to·O_(2)^(-)for efficient NO oxidation over Co single-atom catalyst  

作　　者：Zhengyang Gao Zheng Song Ziwei Miao Chenliang Ye Weijie Yang 

机构地区：[1]School of Energy and Power Engineering,North China Electric Power University,Baoding 071003,China

出　　处：《Nano Research》2025年第3期98-105,共8页纳米研究(英文版)

基　　金：funded by the National Natural Science Foundation of China(Nos.52176104 and 52006073);the Natural Science Foundation of Hebei Province(No.B2023502023);Fundamental Research Fund for the Central Universities(Nos.2023MS125 and 2024MS154).

摘　　要：NO oxidation with H_(2)O_(2)as the oxidant is a promising green denitration technology.However,the current metal oxide catalysts still have many disadvantages for this reaction,such as insufficient catalytic activity for H_(2)O_(2)activation,poor selectivity,and low stability.In this study,we employ atomically dispersed Co anchored on SBA-15 with Co-O_(4)structure for NO oxidation,which achieves a 90%removal efficiency of NO under low molar ratio of H_(2)O_(2)to NO(1.56),ultra-low temperature(80℃),and ultra-high space velocity(720,000 h^(-1)),representing the top-level performance among previously reported catalysts.More interestingly,our work reveals that by taking advantage of the uniform Co-O_(4)structure,H_(2)O_(2)is mainly directionally converted into·O_(2)^(-)at the Co-O_(4)site,and·O_(2)^(-)plays a key role for achieving the deep-oxidation of NO to produce NO_(3)^(-),which is contrast to the previously reports that^(1)O_(2)is the main free radical for NO oxidation.This study highlights the great potentials of single-atom catalysts for improving the H_(2)O_(2)utilization performance for NO oxidation.

关 键 词：Co single-atom catalyst NO oxidation H_(2)O_(2)activation free radical 

分 类 号：O64[理学—物理化学]