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- W3087999168 abstract "Abstract Dependence of NH 3 oxidation on the state and dispersion of Pt species in Pt/γ‐Al 2 O 3 catalysts was investigated. Prereduced Pt/γ‐Al 2 O 3 catalysts containing Pt 0 nanoparticles exhibited significantly higher activity than preoxidized ones with the same Pt dispersion. The most significant improvement of the catalytic activity (TOF increased by 30 times) was observed when the size of Pt 0 particles increased from ∼1 to ∼8 nm. N 2 selectivity was found to be mainly determined by the reaction temperature, with a minor influence of Pt particle size. Preoxidized catalysts containing ionic Pt were activated by the reaction medium, while partial deactivation was observed for the prereduced ones. The activity improvement was associated with the presence of Pt 4+ /Pt 2+ species on the surface of preoxidized catalysts. The activity decrease of the prereduced catalysts was due to the partial oxidation and subsequent redispersion of Pt particles. Introduction of H 2 O and CO 2 to the reaction mixture only moderately influenced NH 3 oxidation activity shifting NH 3 conversion curves by about +15 °C." @default.
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- W3087999168 date "2020-10-28" @default.
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- W3087999168 title "The Effects of Platinum Dispersion and Pt State on Catalytic Properties of Pt/Al <sub>2</sub> O <sub>3</sub> in NH <sub>3</sub> Oxidation" @default.
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- W3087999168 doi "https://doi.org/10.1002/cctc.202001320" @default.
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