SOLID SOLUTIONS AND METHODS OF MAKING THE SAME

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A composite single phase crystalline mixed metal oxide NOx scavenger forming a solid solution, wherein the solid solution has a well defined single phase crystalline structure, as determined by conventional x-ray Diffraction method and, a NOx scavenger disposed within the single phase oxide structure, without formation of additional X-ray discrete phase is presented. The NOx scavenger is formed from oxides of an element selected from the group consisting of alkali metals, alkaline earth metals, transition metals, rare earth metals and mixtures thereof. The aforementioned single phase oxide may possess a cubic fluorite structure and said composite cubic oxide NOx scavenger may be advantageously applied to the control of emissions, of both gaseous and solid or particulate nature, from internal combustions especially engines operating under the principle of compression ignition.