Preparation of Monolithic LaFeO 3 and Catalytic Oxidation of Toluene

Porous LaFeO powders were produced by high-temperature calcination of LaFeO precursors obtained by hydrothermal treatment of corresponding nitrates in the presence of citric acid. Four LaFeO powders calcinated at different temperatures were mixed with appropriate amounts of kaolinite, carboxymethyl cellulose, glycerol and active carbon for the preparation of monolithic LaFeO by extrusion. Porous LaFeO powders were characterized using powder X-ray diffraction, scanning electron microscopy, nitrogen absorption/desorption and X-ray photoelectron spectroscopy. Among the four monolithic LaFeO catalysts, the catalyst calcinated at 700 °C showed the best catalytic activity for the catalytic oxidation of toluene at 36,000 mL/(g∙h), and the corresponding T , T and T was 76 °C, 253 °C and 420 °C, respectively. The catalytic performance is attributed to the larger specific surface area (23.41 m /g), higher surface adsorption of oxygen concentration and larger Fe /Fe ratio associated with LaFeO calcined at 700 °C.