Preparation of alumina-supported LaFeO 3 catalysts and their catalytic activity for propane combustion

Abstract

Supported LaFeO 3 catalysts on alumina were prepared and their catalytic activities for propane oxidation were investigated. Perovskite oxides were selectively deposited in or outside the pore of alumina support (intra- or extra-pore deposition) by using reverse homogeneous precipitation (RHP) and incipient wetness (IW) methods. X-ray diffraction and Raman spectroscopic studies confirmed the formation of the perovskite structure on the alumina support, and revealed that the dispersion of LaFeO 3 on alumina strongly depended on preparation methods. The catalytic activity for propane oxidation also depended on preparation methods, and perovskite catalysts deposited in the intra-pore of alumina showed higher activity than those deposited on the extra-pore of alumina. The activity of LaFeO 3/Al 2O 3 with the intra-pore deposition by the IW method hardly changed up to the calcination temperature of 1000 °C.