Hydrothermal Synthesis of Ce-doped BaZrO₃ Fine Particles and Their Three-way Catalytic Performance for Exhaust Gas Purification

Abstract

Cerium-doped barium zirconate (Ce-doped BaZrO₃) fine particles with high crystallinity was prepared by a hydrothermal reaction using barium hydroxide, CeCl₃, and a Zr-triethanolamine complex. Characterization of the Ce-doped BaZrO₃ particles revealed that utilization of the water-stable Zr-triethanolamine complex was an efficient way to introduce cerium ions into the BaZrO₃ perovskite crystal structure. The three-way catalytic activity of the Ce-doped BaZrO₃ for an exhaust gas conversion reaction was investigated under a stoichiometric condition (CO 0.5%, C₃H₆ 400 ppm, NO 500 ppm, O₂ 0.49%, H₂ 0.17%, CO₂ 14%, H₂O 10% in N₂). The Ce-doped BaZrO₃ exhibited a remarkable low temperature NO_x cleaning performance when the Ce-doped BaZrO₃ was applied as an alternative for an Al₂O₃ support.