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Influence of Titania Synthesized by Pulsed Laser Ablation on the State of Platinum during Ammonia Oxidation

Stadnichenko, Andrey; Svintsitskiy, Dmitry; Kibis, Lidiya; Fedorova, Elizaveta; Stonkus, Olga; Slavinskaya, Elena; Lapin, Ivan; Fakhrutdinova, Elena; Svetlichnyi, Valery; Romanenko, Anatoly; Doronkin, Dmitry; Marchuk, Vasyl; Grunwaldt, Jan-Dierk; Boronin, Andrei

Abstract:
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/TiO$_{2}$ catalysts prepared by impregnation using a commercial TiO$_{2}$-P25 support and a support produced by pulsed laser ablation in liquid (PLA). The Pt/TiO$_{2}$-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/TiO$_{2}$-P25 catalysts were characterized by uniform distribution of the Pt species over the support. Analysis of Pt4f XP spectra shows that oxidized Pt$^{2+}$ and Pt$^{4+}$ species are formed in the Pt/TiO$_{2}$-P25 catalysts, while the platinum oxidation state in the Pt/TiO$_{2}$-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 Pt$^{2+}$ 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/TiO$_{2}$-PLA samples show higher stability during catalysis and significantly higher selectivity to N$_{2}$ in a wide temperature range of 200–400 °C.

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Verlagsausgabe §
DOI: 10.5445/IR/1000121095
Veröffentlicht am 08.10.2020
Originalveröffentlichung
DOI: 10.3390/app10144699
Scopus
Zitationen: 2
Dimensions
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -technologie (IKFT)
Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2076-3417
KITopen-ID: 1000121095
HGF-Programm 37.03.01 (POF III, LK 01) Catalysts and Mechanisms
Erschienen in Applied Sciences
Verlag MDPI
Band 10
Heft 14
Seiten Art. Nr.: 4699
Bemerkung zur Veröffentlichung This article belongs to the Special Issue Applications of X-ray Photoelectron Spectroscopy (XPS)
Vorab online veröffentlicht am 08.07.2020
Schlagwörter Pt/TiO2, NH3 oxidation, pulsed laser ablation, XPS
Nachgewiesen in Dimensions
Web of Science
Scopus
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