Abstract: The perovskit-type oxide LaFeO3 catalyst was prepared by the sol-gel method. The structure, shape, particle size, surface species, and specific surface aera of the catalyst were characterized byX-raydiffraction, scanning electron microscopy,X-rayphotoelectron spectroscopy, and N2 adsorption. The catalyst was used for wet oxidation of lignin to aromatic aldehydes and showed high activity and stability. Compared with a non-catalytic process, lignin conversion and yield of each aromatic aldehyde increased significantly, among which the yield of syringaldehyde was the highest. The maximum yield of syringaldehyde was 1.85 times that of the non-catalytic process. The activity and perovskite-type structure of the LaFeO3 catalyst almost remained unchanged after five successive operations.

Key words: perovskite-type oxide, lignin, catalytic wet aerobic oxidation, aromatic aldehyde, reusability