Composite Catalyst Materials And Method For The Selective Reduction Of Nitrogen Oxides

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Composite catalyst materials that may be used to reduce nitrogen oxides to nitrogen gas in the presence of other gasses without significant poisoning of the composite catalyst materials or reaction with the other gasses. The composite catalyst materials are formed of a matrix material comprised of cerium oxide doped with alkaline earth metal oxides, rare earth metal oxides, and combinations thereof wherein the cerium oxide comprises more than 50 atomic percent of the matrix material, and nanoparticles comprising transition metal oxides wherein the transition metal oxides comprise less than 20 atomic percent of the composite catalyst material. The composite catalyst materials may further contain noble metals dispersed in the matrix material.