Chain effect of Mn4+/ Mn3+ and OLattice on La1-xSrxMnO3 catalysts for lower thermally driven CO oxidation

被引：0

作者：

Duan, Xu ^{[1
]}

Yang, Jian ^{[1
]}

Zhu, Jiaqing ^{[1
]}

Li, Hongbin ^{[1
]}

Li, Huan ^{[1
]}

Liu, Runxue ^{[1
]}

Fang, Yujie ^{[1
]}

Liu, Qingcai ^{[1
]}

Liu, Weizao ^{[1
]}

Ding, Chunlian ^{[1
]}

Li, Jiangling ^{[1
]}

Ren, Shan ^{[2
]}

机构：

[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China

[2] Xi An Jiao Tong Univ, Sch Energy & Power Engn, State Key Lab Multiphase Flow Power Engn, Xian 710049, Peoples R China

来源：

JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING | 2024年 / 12卷 / 06期

基金：

中国国家自然科学基金;

关键词：

CO oxidation; Thermal catalysis; Oxygen vacancy; Mv-K mechanism; Lattice oxygen; La1-xSrxMnO3; PEROVSKITE OXIDE CATALYSTS; CARBON-MONOXIDE; CALCINATION TEMPERATURE; PERFORMANCE; NO; SR; SUBSTITUTION; COMBUSTION; SURFACE; LAMNO3;

D O I：

10.1016/j.jece.2024.114938

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In this work, a series of La1-xSrxMnO3 catalysts for CO oxidation were successfully fabricated via a facile sol-gel method with multistage calcination. By modifying the Sr doping quantity at A-site, the surface Mn4+/ Mn3+ ratio was manipulated, and thus lattice oxygen and oxygen vacancy concentrations of were further regulated by the system electron migration. This domino effect produced a radically different catalytic response, of which the optimal La0.4Sr0.6MnO3 samples performed the most excellent CO oxidation at lower temperature window. In-situ DRFITS spectra revealed catalytic intermediates and demonstrated the concurrence of dominant Mv-K mechanism and secondary E-R reaction pathway in CO oxidation over La0.4Sr0.6MnO3 under three types of thermodynamic states. The study is poised to enhance the propagation and practical employment of Sr-doped LaMnO3 perovskite catalysts, while supplying theoretical perspectives for the investigation towards underlying CO reaction mechanisms.

引用

页数：13

共 42 条

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