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Article Dans Une Revue Applied Catalysis B: Environmental Année : 2021

La1-x(Sr, Na, K)xMnO3 perovskites for HCHO oxidation: the role of oxygen species on the catalytic mechanism

Résumé

A-site substituted perovskites were prepared and evaluated for formaldehyde oxidation. Based on the T50, 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.

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Catalyse
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hal-03138753 , version 1 (11-02-2021)

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Yin Xu, Jérémy Dhainaut, Jean-Philippe Dacquin, Anne-Sophie Mamede, Maya Marinova, et al.. La1-x(Sr, Na, K)xMnO3 perovskites for HCHO oxidation: the role of oxygen species on the catalytic mechanism. Applied Catalysis B: Environmental, In press, 287, pp.119955. ⟨10.1016/j.apcatb.2021.119955⟩. ⟨hal-03138753⟩
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