Abstract
A palladium-lanthanum (Pd-La) catalyst was found to be more active for NO reduction than a palladium (Pd) catalyst under the reducing conditions found in engine exhaust gas. Both the Pd-La and Pd catalysts had same activities for the NO reduction with CO. However, in the presence of hydrocarbons, the NO reduction activity of a Pd-La catalyst was much better than that of a Pd catalyst. The NO reduction of the Pd catalyst was significantly inhibited by hydrocarbons. The behavior of the adsorbed hydrocarbons on the both catalysts were studied by means of the transient response method. The hydrocarbon was more strongly adsorbed on the Pd catalyst than on the Pd-La catalyst. Also, the partial oxidation activity of hydrocarbon for the Pd-La catalyst was much better than that for the Pd catalyst. The presence of lanthanum in the Pd-La catalyst perhaps weakens the adsorption strength of hydrocarbons.
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