Study on platinum-ceria-alumina catalysts to enhance activity and durability for catalytic reaction

Abstract

As the demand for hybrid vehicles increases, a cold-start problem is emerging. Since the catalyst is located adjacent to the exhaust manifold, it is exposed to the high temperatures over 800 ℃ during high-speed driving. Therefore, a catalyst needs to be developed that can exhibit high reactivity at a low temperature and durability at a high temperature. In this study, we synthesized platinum-ceria-alumina catalysts having both low-temperature reactivity and high-temperature durability by wet impregnation simultaneously. With TEM and other characterization as HAADF-STEM, XRD, XPS, and CO-DRIFT, it was confirmed that ceria was formed on alumina apart from each other and that most of the platinum was on the surface of the ceria. As a result of the exhaust gas purification reaction performance evaluation, the low-temperature reactivity of the platinum-ceria-alumina catalyst was higher than other catalysts. After aging at 750 ℃ for 10 hours, it was confirmed that the catalyst structure and reactivity were similar to those before aging.