The National Institute of Materials and Chemical Research reportedly has developed a new catalyst for diesel engines that it claims is extremely effective in reducing oxides of nitrogen (NOx) emissions from diesel exhaust. The catalyst washcoat is a mixture of of gallium oxide and alumina, which the NIMCR says promotes a chemical reaction that reduces NOx to base elements of nitrogen, water and carbon dioxide. In testing with diesel exhaust containing ten times the typical amount of sulfur ...

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