Influence of titania synthesized by pulsed laser ablation on the state of platinum during ammonia oxidation

doi:10.3390/app10144699

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Influence of titania synthesized by pulsed laser ablation on the state of platinum during ammonia oxidation	7 MB	Adobe Acrobat PDF	Read	Download
DOI Доступ к ресурсу на сайте издателя			10.3390/app10144699

#импульсная лазерная абляция

#рентгеновская фотоэлектронная спектроскопия

#катализаторы

#диоксид титана

#платина

Title: Influence of titania synthesized by pulsed laser ablation on the state of platinum during ammonia oxidation
Creator: Svintsitskiy, Dmitry A.
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Kibis, Lidiya S.
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Fedorova, Elizaveta A.
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Stonkus, Olga A.
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Slavinskaya, Elena M.
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Lapin, Ivan N.
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Fakhrutdinova, Elena D.
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Svetlichnyi, Valerii A.
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Romanenko, Anatoly V.
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Stadnichenko, Andrey I.
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Doronkin, Dmitry
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Marchuk, Vasyl
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Grunwaldt, Jan-Dierk
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Boronin, Andrei I.
Date: 2020
DOI: 10.3390/app10144699
Description: A set of physicochemical methods, including X-ray photoelectron spectroscopy (XPS), X-ray diffraction, electron microscopy and X-ray absorption spectroscopy, was applied to study Pt/TiO2 catalysts prepared by impregnation using a commercial TiO2-P25 support and a support produced by pulsed laser ablation in liquid (PLA). The Pt/TiO2-PLA catalysts showed increased thermal stability due to the localization of the highly dispersed platinum species at the intercrystalline boundaries of the support particles. In contrast, the Pt/TiO2-P25 catalysts were characterized by uniform distribution of the Pt species over the support. Analysis of Pt4f XP spectra shows that oxidized Pt2+ and Pt4+ species are formed in the Pt/TiO2-P25 catalysts, while the platinum oxidation state in the Pt/TiO2-PLA catalysts is lower due to stronger interaction of the active component with the support due to strong interaction via Pt-O-Ti bonds. The Pt4f XP spectra of the samples after reaction show Pt2+ and metallic platinum, which is the catalytically active species. The study of the catalytic properties in ammonia oxidation showed that, unlike the catalysts prepared with a commercial support, the Pt/TiO2-PLA samples show higher stability during catalysis and significantly higher selectivity to N2 in a wide temperature range of 200–400 °C.