PREPARATION AND CHARACTERIZATION OF AG MNOX/PEROVSKITE CATALYSTS FOR CO OXIDATION/

The spray decomposition method with lanthanum nitrate, manganese nitra te, silver nitrate and citric acid was used to synthesize Ag-and Mn-in corporated perovskites. The resulting samples were characterized by X- ray diffraction, BET adsorption measurement, X-ray photoelectron spect roscopy, and temperature-programmed oxygen desorption (O-2-TPD) measur ement. The obtained composite Ag/MnOx/perovskites catalysts exhibit hi gher activity by a few orders of magnitude at 338 K than that of LaMnO 3. From the O-2-TPD measurement, the high activity of the Ag/MnOx/pero vskites may result from the increase of weak oxygen adsorption below 3 73 K.