Reactive Grinding synthesis of La(Sr, Ce)CoO3 and their properties in toluene catalytic total oxidation. Issue 8 (11th March 2020)

• Record Type: Journal Article
• Authors: Heidinger, Bertrand; Royer, Sébastien; Giraudon, Jean‐Marc; Gardoll, Olivier; Alamdari, Houshang; Lamonier, Jean‐François
• Is Part Of: ChemCatChem. Volume 12:Issue 8(2020)
• Page Start: 2271
• Page End: 2282
• Publication Date: 2020-03-11
• Subjects: volatile organic compounds -- catalytic oxidation -- perovskite -- reactive grinding -- toluene; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.201902112
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: Perovskites‐type metal oxides are an attractive alternative to noble metal‐based materials for environmental catalysis. Nevertheless, they suffer from major issues such as unattractive textural properties and lower intrinsic activities than those of noble metal counterparts. Reactive grinding (RG) has been already proved to be a powerful method to produce materials with improved textural properties. La1‐x A'x CoO3 (A': Sr, Ce) perovskite‐type materials were synthesized by RG synthesis as a 3‐steps top down method: (i) conventional solid‐state reaction – SSR (leading to microcrystalline material); (ii) high energy ball milling – HEBM and (iii) low energy ball milling – LEBM. The physicochemical properties of perovskite materials were investigated by XRD, N2 ‐physisorption, H2 ‐TPR, O2 ‐TPD and XPS, while their catalytic performances were evaluated for the toluene total oxidation reaction. In this study we showed that the HEBM step leads in a drastic reduction in crystal size to nanometric scale along with aggregation into dense particles. The LEBM step allows the deagglomeration of particles and specific surface areas were significantly increased. Their performances in the toluene total oxidation increased along grinding steps and a maximum of catalytic performance was observed for La0.9 Sr0.1 CoO3 . This material also exhibited a high catalytic stability as a function of the reaction time, under dry and wet air reaction conditions. Abstract : Catalytic oxidation : The effect of strontium and cerium substitution into LaCoO3 materials have been studied for the toluene oxidation. Materials with better catalytic performances had been observed, due to improved redox properties. They also show very good stability with only a slight deactivation over 70 hours of reaction time.