No abstract

Ce0.5 + x Zr0.4-x La0.1O2-Al2O3 catalysts were prepared by co-precipitation, where 0≤x≤0.4 and the mass ratio of Ce0.5 + xZr0.4-xLa0.1O2:Al2O3 was 1:1. The catalytic activities of these catalysts for the catalytic combustion of diesel soot were investigated. The catalysts were further characterized by low temperature nitrogen adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), H2temperature-programmed reduction (H2-TPR), and O2-temperature-programmed desorption (O2-TPD). The results showed that all the catalysts formed solid solutions with a fluorite-like structure. When x=0.2, the Ce 3 + ions were partly rich on the surface of the catalyst. The catalyst was easily reduced by H2 and the desorption peak area of the β oxygen species was the largest. The light-off temperature was 360°C for the catalytic combustion of diesel soot over the catalyst suggesting good catalytic activity and potential application in diesel soot catalytic combustion.