Perovskite-type oxides – catalysts for the total oxidation of chlorinated hydrocarbons

• Published in: Applied catalysis. B, Environmental Environmental, 1998-11, Vol.19 (2), p.143-151
• Main Authors: Kießling, D., Schneider, R., Kraak, P., Haftendorn, M., Wendt, G.
• Format: Article
• Language: English
• Subjects: By-products; Catalysis; Catalyst deactivation; Catalysts: preparations and properties; Chemistry; Chlorinated hydrocarbons; Exact sciences and technology; General and physical chemistry; Perovskite-type oxides; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Total oxidation
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/S0926-3373(98)00073-3

Chloromethane, dichloromethane and 1,2-dichloroethane were completely decomposed in air on perovskite-type catalysts (LaMnO3, LaCoO3, (La0.84,Sr0.16)(Mn0.67,Co0.33)O3) at reaction temperatures above 550°C. Besides the main reaction products (carbon dioxide, water and hydrochloric acid), by-products (higher chlorinated-, C–C coupling- and cracking products) were formed in the low temperature range. Depending on the reaction temperature, residence time and kind of chlorinated hydrocarbon a reversible catalyst deactivation takes place. In the case of LaCoO3 catalysts an irreversible deactivation was observed. X-ray diffraction (XRD) and electron probe microanalysis (EPMA) measurements with the perovskite-type catalysts after interaction of chlorinated hydrocarbons indicate the formation of chlorinated species on the catalyst surface and in the bulk.