Synthesis of ultrafine particles with perovskite structure and its catalytic performance for the oxidation of co

摘要

A technique for synthesizing ultrafine LaBO_3 (B:Co and Mn) and La_1-xSr_xBO_3 with perovskite structure was developed, in which solution of Na_2CO_3-NaOH was taken as precipitating agent and supercritical drying method was used. It was shown that the mean particle size of the samples made through this technique reached about 15 nm and its corresponding specific surface area was 30 m~2/g. The activity for CO oxidation over LaBO_3 increased significantly with the decrease of its particle size in addition, the substitution of strontinum for lanthanum in nanometer LaBO_3 could elevate the activity effectively.