(532ct) Enhancing Thermal Resistance and Performance of Three-Way Catalyst By Physical Mixing of Bimetallic Catalysts

As the problem of environmental pollution problems grow around the world, regulations on harmful gases emitted from vehicles which have effect on environmental pollution are being strengthened day by day. Among them, gasoline vehicles need to reduce emissions of CO, NO_x, HC, etc., which are harmful gases emitted by automobiles, so it is necessary to develop catalysts which can eliminate harmful gases, and research is needed to increase the catalyst activity according to regulations.
Precious metals used in three-way catalysts(TWC) typically include Pt, Pd, and Rh. Pd and Pt are mainly used in oxidation reactions and Rh in reduction reactions. Morphology of the catalysts is altered by synthesis methods and their activity is also changed, too. In addition, in the case of gasoline vehicles, since engine temperature exceeds 900℃ while driving, a high performance and high thermal resistance TWC that maintains the catalyst performance at high temperature is required.
This research identified synthesis methods which have the most activity and thermal resistance, so it is studied that physical mixing method of bimetallic catalysts makes better thermal resistance and performance than trimetallic catalysts which is made by incipient wetness method. And developed optimal catalysts by adjusting the ratio of precious metals and conducted various characterization analysis on catalysts.