Zirconium-doped lanthanum manganites for catalytic deep oxidation of propene

Powders of lanthanum manganite partially substituted on the lanthanum site by strontium and on the manganese site by zirconium were obtained by self-propagating high-temperature synthesis. The catalysts were characterized by XRD, BET and temperature-programmed techniques. The insertion of zirconium in the structure was verified by Mn titration and cell volume calculations. The obtained specific surface areas were between 11 and 16 m2 g−1 depending on the composition. Catalytic activity measurements were performed for the deep oxidation of propene. The activity decreased when increasing the amount of zirconium. This was linked to the reinforcement of the oxygen bound on the catalyst as demonstrated by temperature-programmed desorption techniques.

Figure optionsDownload high-quality image (87 K)Download as PowerPoint slideResearch highlights▶ Zirconium substituted lanthanum manganites perovskites. ▶ Self-propagating high-temperature method. ▶ Catalytic activity for propene combustion inhibited by the zirconium substitution. ▶ Modifications of the oxygen chemisorption properties.