Preparation of Ce-Zr-La-Al2O3 and Supported Single Palladium Three-Way Catalyst

Ce-Zr-La-Al2O3 (CZLA) was prepared by co-precipitation and incipient wet impregnation methods and characterized by N2 adsorption and X-ray diffraction. The 2%Pd/CZLA catalysts were prepared and studied by temperature-programmed reduction and activity tests. The CZLA supports prepared by the two methods showed good structural, textural, and oxygen storage properties, and the CZLA prepared by co-precipitation was more resistant to aging. The single Pd catalysts showed low light-off temperature and high three-way catalytic activity, especially the excellent NO conversion and aging resistance.