摘要
Air pollution from particulate matter produced by incomplete combustion of diesel fuel has become a serious environmental pollution problem,which can be addressed by catalytic combustion.In this work,a series of K-modified MnO_(δ)catalysts with different microstructures were synthesized by the hydrothermal method,the relationship between structure of the catalysts and their catalytic performance for soot combustion was studied by characterization techniques and density functional theory(DFT)calculations.Results showed that the prepared catalysts had good catalytic performance for soot combustion and could completely oxidize soot at temperatures below 400℃.The cryptomelane-type K_(2−x)Mn_(8)O_(16)(K-OMS-2)with tunnel structure had excellent NO oxidation capacity and abundance of Mn^(4+)ions(Mn^(4+)/Mn^(3+)=1.24)with good redox ability,it demonstrated better soot combustion performance than layered birnessite-type K_(2)Mn_(4)O_(8)(K-OL-1).The T_(10),T_(50),T_(90)temperatures of KOMS-2 were 269,314,346℃,respectively.The K-OMS-2 catalyst also showed excellent stability after five catalytic cycles,with T_(10),T_(50),T_(90)values holding in the ranges of 270±2,316±2,348±3℃,respectively.
基金
the Key Research and Development Program of MOST(No.2017YFE0131200)for collaboration between China and Poland
the National Natural Science Foundation of China(Nos.22072095 and U1908204)
University Joint Education Project for China-Central and Eastern European Countries(No.2021097)
National Engineering Laboratory for Mobile Source Emission Control Technology(No.NELMS2018A04)
Liaoning Provincial central government guides local science and technology development funds(No.2022JH6/100100052)
Major/Key Project of Graduate Education and Teaching Reform of Shenyang Normal University(No.YJSJG120210008/YJSJG220210022)
University level innovation team of Shenyang Normal University
and Major Incubation Program of Shenyang Normal University(No.ZD201901)。
作者简介
Chao Peng,contributed equally to this work;Yu Ren,contributed equally to this work;Address correspondence to Xuehua Yu,yuxuehua1986@163.com;Address correspondence to Zhen Zhao,zhenzhao@cup.edu.cn,zhaozhen1586@163.com。
