Synthesis, characteristics, and redox properties of Zr/Sn-doped CeO2 nanoparticles in H2 gas at high temperatures

Abstract

Abstract Metal(M = Zr, Sn)-doped CeO2 nanoparticles were synthesized by a hydrothermal process to develop PdO@M-doped CeO2 catalysts. The average particle size of both M-doped CeO2 nanoparticles was under 10 nm, whereas the particle size reduced as the dopant concentration increased in the M-doped CeO2 nanoparticles. The largest specific surface area was 226 m2/g in the Zr-doped CeO2 nanoparticles. The particle morphology showed a spherical shape in both M-doped CeO2 nanoparticles. The PdO@M-doped CeO2 catalysts were then prepared by adsorbing Pd(OH)2 onto the surface of M-doped CeO2 nanoparticles by a precipitation method and synthesizing the catalysts by calcining at 500 °C for 3 h. The H2 consumptions of the PdO@M-doped CeO2 catalysts were characterized as the oxygen storage capacity at various temperatures. The results show that the oxygen storage capacities of the PdO@M-doped CeO2 catalysts are superior to that of the pure CeO2 catalyst at temperatures higher than 550 °C. The oxygen storage capacity of the PdO@Sn-doped CeO2 catalyst is better than that of the PdO@Zr-doped CeO2 catalyst.