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 heterogeneous decomposition of nitric oxide on supported catalysts.
Abstract Heterogeneous decomposition rates of nitric oxide in the temperature range from 300 to 800° are determined for a series of supported catalysts containing platinum, or the oxides of copper, chromium, and cobalt. The experiments have been carried out in a conventional integral flow reactor, and complete analyses of the gas compositions obtained by a mass spectrometer. Kinetic parameters such as activation energy and reaction order are given. A comparison is made with published data for similar catalysts, and reasons for disagreement are considered. It is concluded in view of the presently available catalysts that the practical application of catalyzed decomposition is not promising for the removal of NO from automobile exhaust.
Catalytic decomposition of nitric oxide
Catalytic decomposition of nitric oxide at a concentration of 0.404 and 0.432% by volume in nitrogen was studied in a tubular flow reactor. The packing consisted of alumina pellets impregnated with 0.1% by weight of platinum oxide and 3.0% by weight of nickel oxide. Tests were conducted at pressures of 1 to 15 atm. and temperatures from 800° to 1,000°F. A rate equation correlating the data as a function of temperature, pressure, and compositions was developed. A reaction mechanism compatible with the rate equation is proposed.