The catalytic reduction of nitric oxide in automobile exhause gases--I. Tests of iron-containing materials.
Abstract The efficiencies of iron-containing catalysts for the reduction of nitric oxide in simulated and real exhaust gases are reported. The catalyst bed was seven times the swept volume of the engine. The best results were obtained when the engines were run about 10 per cent rich of stoicheiometric. The rate at which the catalyst was poisoned by conventional fuel additives was shown to be reduced by raising the working temperature of the reactor.
The catalytic reduction of nitric oxide in automobile exhaust gases--II. The kinetics of the reactions of carbon monoxide with nitric oxide and/or oxygen on an oxidized stainless-steel surface.
Abstract A flow-tube reactor has been used to examine the kinetics of the catalysed reactions of carbon monoxide with nitric oxide and/or oxygen on a steel surface. The order of the reaction has been determined and a reaction mechanism proposed. The inhibiting effect of oxygen on the reduction of nitric oxide is analysed, and the pertinence of these results to the treatment of automobile exhaust gases is discussed.
Hydrogen-oxygen titration method for the measurement of supported palladium surface areas
Abstract The titration by means of hydrogen or deuterium at 100 °C of oxygen preadsorbed on a supported palladium catalyst has been used to measure the dispersion of the palladium. Results agree with those obtained by X-ray line broadening and chemisorption of oxygen or carbon monoxide. The titration, which is done at pressures where a negligible amount of bulk hydride forms, has distinct advantages over the other methods.