Preparation and characterization of highly active nanosized strontium-doped lanthanum cobaltate catalysts with high surface areas

摘要: La1−xSrxCoO3-δ (x=0, 0.4) nanoparticles have been prepared using the citric acid complexing-hydrothermal synthesis coupled method and complexing method. The physico-chemical properties of these materials were characterized by means X-ray diffraction (XRD), high resolution scanning electron microscopy (HRSEM), element analysis (EDX), photoelectron spectroscopic (XPS), oxygen temperature-programmed desorption (O2-TPD), hydrogen reduction (H2-TPR) as well surface area measurements oxidation state titration. Their catalytic performance was examined for total ethylacetate (EA). It is found that La1−xSrxCoO3−δ catalysts single-phase rhombo-hedrally-structured perovskites their areas ranged from 16 to 26 m2/g. Sr-doped sample derived procedure uniformly distributed with a short rod-shaped morphology. doping Sr (i) enhanced concentrations Co3+ vacancies, (ii) increased amount adsorbed on at low temperatures, (iii) promoted mobility lattice oxygen, (iv) improved redox. La0.6Sr0.4CoO2.78 catalyst strategy performed best in EA, furthermore no partially oxidized products formed. Based above results, we conclude addition area, activity perovskite-type oxide associated structural defect (oxygen vacancy) concentration redox ability.