1973
DOI: 10.1126/science.180.4081.62
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Rare-Earth Manganites: Catalysts with Low Ammonia Yield in the Reduction of Nitrogen Oxides

Abstract: Rare-earth manganites such as La(1-x) Pb(x)MnO(3), 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.

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Cited by 145 publications
(59 citation statements)
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“…The diffusional models D 2 , D 3 , D 4 showed the best accordance with the experimental data. Table 2 for Regime(i), once more confirmed to be the signature of a rate-determining step representing oxygen diffusion.…”
Section: Selection Of the G(α) Model Functionsupporting
confidence: 53%
See 1 more Smart Citation
“…The diffusional models D 2 , D 3 , D 4 showed the best accordance with the experimental data. Table 2 for Regime(i), once more confirmed to be the signature of a rate-determining step representing oxygen diffusion.…”
Section: Selection Of the G(α) Model Functionsupporting
confidence: 53%
“…The suprafacial one is active at relatively low temperature (T < 673K) and involves surface oxygen, whereas the intrafacial one, occurring at higher temperature, is related to oxygen mobility as well as release from the bulk. This, in turn, depends on the redox properties of the B ion [4].…”
Section: Introductionmentioning
confidence: 99%
“…Already, in 1971, LaCoO 3 perovskite-type oxide was proposed as an economic substitute for noble metal-based exhaust after treatment catalysts [6]. Co-, Fe-, Mn-, and Ru-based perovskite-type oxides exhibited promising activity for the oxidation of CO and the reduction of NO x [7][8][9][10][11]. La 0.8 Sr 0.2 CoO 3 was shown to compare well with 1 wt% Pt/Al 2 O 3 for hydrocarbon oxidation [12].…”
Section: Introductionmentioning
confidence: 99%
“…The oxidation reactions are known to occur through two possible mechanisms: a suprafacial and/or an intrafacial mechanism [40]. The former mechanism is operative a T < 400 8C and involves oxygen species adsorbed over the surface oxygen vacancies of the catalyst.…”
Section: H 6 -Tpr and Tpd Studiesmentioning
confidence: 99%