标题: La1-x(Sr, Na, K)(x)MnO3 perovskites for HCHO oxidation: The role of oxygen species on the catalytic mechanism

作者: Xu, Y (Xu, Yin); Dhainaut, J (Dhainaut, Jeremy); Dacquin, JP (Dacquin, Jean-Philippe); Mamede, AS (Mamede, Anne-Sophie); Marinova, M (Marinova, Maya); Lamonier, JF (Lamonier, Jean-Francois); Vezin, H (Vezin, Herve); Zhang, H (Zhang, Hui); Royer, S (Royer, Sebastien)

来源出版物: APPLIED CATALYSIS B-ENVIRONMENTAL  卷: 287  文献号: 119955  DOI: 10.1016/j.apcatb.2021.119955  出版年: JUN 15 2021  

摘要: A-site substituted perovskites were prepared and evaluated for formaldehyde oxidation. Based on the T-50, the catalytic activity ranking was: La0.8K0.2MnO3 > La0.8Na0.2MnO3 (LNMO) > La0.8Sr0.2MnO3 > LaMnO3. This improved activity is associated to (i) higher density of surface adsorption sites and (ii) higher bulk oxygen mobility. Stability tests, under humid and dry conditions, were also conducted. In dry conditions, a gradual deactivation of the substituted perovskites (from 50 % to 15 % HCHO conversion after 64 h, LNMO) was correlated to the loss of surface-active oxygen species and high-valence Mn4+. Besides, the presence of abundant adsorbed oxidation intermediates likely inhibited the reactivation of the catalyst surface. This inhibition was limited when humidity was added in the stream of gas, thus lowering the catalysts' deactivation, demonstrating the importance of OH surface groups on the catalyst surface in the oxidation mechanism. Consequently, this work highlights the design of perovskite-based catalysts with superior oxidation properties.

入藏号: WOS:000632998600002

语言: English

文献类型: Article

作者关键词: Formaldehyde oxidation; Perovskite; A-site substitution; Deactivation; Oxidation mechanism

地址: [Xu, Yin; Zhang, Hui] Wuhan Univ, Hubei Environm Remediat Mat Engn Technol Res Ctr, Dept Environm Sci & Engn, Wuhan 430079, Peoples R China.

[Xu, Yin; Dhainaut, Jeremy; Dacquin, Jean-Philippe; Mamede, Anne-Sophie; Lamonier, Jean-Francois; Royer, Sebastien] Univ Lille, Univ Artois, CNRS, Cent Lille,UMR 8181,UCCS,Unite Catalyse & Chim So, F-59000 Lille, France.

[Marinova, Maya] Univ Lille, CNRS, INRA, Cent Lille,Univ Artois,FR 2638,IMEC,Inst Michel E, F-59000 Lille, France.

[Vezin, Herve] Univ Lille, CNRS, UMR 8516, LASIRE,Lab Avance Spect Interact Reactivite & Env, F-59000 Lille, France.

[Xu, Yin] Hubei Univ, Sch Resources & Environm Sci, Wuhan 430062, Peoples R China.

通讯作者地址: Zhang, H (通讯作者)，Wuhan Univ, Hubei Environm Remediat Mat Engn Technol Res Ctr, Dept Environm Sci & Engn, Wuhan 430079, Peoples R China.

Dhainaut, J (通讯作者)，Univ Lille, Univ Artois, CNRS, Cent Lille,UMR 8181,UCCS,Unite Catalyse & Chim So, F-59000 Lille, France.

电子邮件地址: jeremy.dhainaut@univ-lille.fr; eeng@whu.edu.cn

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