Preparation of CeO_2-based Nanoparticles and Their Catalytic Properties for Soot Combustion

摘要

CeO_2 and CeO_2-ZrO_2 (CZ) nanoparticle catalysts were prepared by hydrothermal method and their catalytic soot combustion activities were studied. Nanoparticles were characterized by X-ray diffraction (XRD), Raman scattering, N_2-physisorption, transmission electron microscope (TEM) and thermogravimetric (TG) analysis. It was observed that both of CeO_2-based particles were pseudocubic nanometer-sized crystals with less than 10 nm in diameter. TG measurement of mixture between soot and catalysts showed the excellent catalytic effect on soot combustion. CeO_2 accelerated soot combustion in which peak temperatures were shifted to 381°C from ordinary soot combustion temperature of 657°C. In this work, soot combustion catalysis was demonstrated by synthesized nanoparticles.