Study on preparation and performance of PtCexZr1-xO2 catalysts for soot oxidation

ZHU Jing-fang1, 2, DU Ao-lin2, GAO Kun-yang2, CHANG Shi-ying1,

ZHAO Yun-kun1, 2, YANG Dong-xia1, PAN Zai-fu2, GU Yong-wan1 *

(1. Kunming Sino-platinum Metals Catalyst Co. Ltd., Kunming 650106, China; 2. State Key Laboratory Advanced Technologies of Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China)

Abstract: A series of PtCexZr1-xO2 catalysts were prepared by one-step hydrothermal crystallization method. The influences of the molar rate of Ce and Zr (nCe/nZr) on physical and chemical properties of the catalysts were investigated by specific surface area, oxygen storage capacity, reduction temperature test and X-ray diffractometer methods. The results showed that the catalyst with a ratio of nCe/nZr=5:5 had the smallest grain size, higher oxygen storage capacity, lower reduction temperature, and that the microstructure was solid solution nanoparticles with tetragonal and cubic phases. Compared with the Pt/Ce0.5Zr0.5O2 catalyst prepared by a traditional method, the PtCe0.5Zr0.5O2 catalyst prepared by one-step hydrothermal crystallization method had better catalytic activity for soot low-temperature oxidation.

Key words: catalyst chemistry; Pt-Ce-Zr catalyst; one-pot synthesis; soot low-temperature oxidation