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The present invention provides a process for catalytically reducing nitrogen oxides in an exhaust gas stream containing nitrogen oxides and hydrocarbons by contacting the gas stream under conditions effective to catalytically reduce the nitrogen oxides with a catalyst comprising a aluminum-silicate type material and a minor amount of a transition metal , the catalyst characterized as having sufficient catalytic activity so as to reduce the nitrogen oxides by at least 50 percent under temperatures within the range of from about 200oC to about 400oC . Rauchfuss is interested in understanding the chemistry of certain bacteria that make hydrogen from water and then oxidize it as fuel , using catalysts made from iron and nickel in enzymes now known as hydrogenases . In the new process , the catalysts produced using nanotechnology deliver a chemical process that is friendly to the environment . In tests , the catalyst performed up to 25 percent better than a commercially available alternative.Ozkan described the catalyst Wednesday at the American Chemical Society national meeting in San Diego.Around the world , researchers are working to develop fuel cells - - devices which would use chemical reactions to produce electricity .