Rare-Earth Manganites: Catalysts with Low Ammonia Yield in the Reduction of Nitrogen Oxides

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Science  06 Apr 1973:
Vol. 180, Issue 4081, pp. 62-64
DOI: 10.1126/science.180.4081.62


Rare-earth manganites such as La1-x PbxMnO3, with 0.3 〈 x 〈 0.6, and their perovskite-like homologs are active catalysts for the reduction of nitric oxide to molecular nitrogen. At low temperatures, innocuous nitrous oxide rather than anmmonia is the main side product. The activity of single crystalline catalysts and of ceramic catalysts of this type is substantially improved by etching with dilute acids.