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In situ probing of Pt/TiO$_{2}$ activity in low-temperature ammonia oxidation

Kibis, Lidiya S.; Svintsitskiy, Dmitry; Stadnichenko, Andrey I.; Slavinskaya, Elena M.; Romanenko, Anatoly; Fedorova, Elizaveta A.; Stonkus, Olga A.; Svetlichnyi, Valery; Fakhrutdinova, Elena D.; Vorokhta, Mykhailo; Šmíd, Břetislav; Doronkin, Dmitry E.; Marchuk, Vasyl; Grunwaldt, Jan-Dierk; Boronin, Andrei I.

The improvement of the low-temperature activity of the supported platinum catalysts in selective ammonia oxidation to nitrogen is still a challenging task. The recent developments in in situ/operando characterization techniques allows to bring new insight into the properties of the systems in correlation with their catalytic activity. In this work, near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) and operando X-ray absorption spectroscopy (XAS) techniques were applied to study Pt/TiO$_{2}$ catalysts in ammonia oxidation (NH$_{3}$ + O$_{2}$ reaction). Several synthesis methods were used to obtain samples with different size of Pt particles, oxidation state of Pt, and morphology of the support. Metal platinum particles on titania prepared by pulsed laser ablation in liquids exhibited the highest activity at lower temperatures with the temperature of 50% conversion of NH$_{3}$ being 150 °C. The low-temperature activity of the catalysts synthesized by impregnation can be improved by the reductive pretreatment. NAP-XPS and operando XANES data do not show formation of PtO$_{x}$ surface layers or PtO/PtO$_{2}$ oxides during NH$_{3}$ + O$_{2}$ reaction. ... mehr

Postprint §
DOI: 10.5445/IR/1000125944
Veröffentlicht am 11.11.2021
DOI: 10.1039/d0cy01533d
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -technologie (IKFT)
Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 01.2021
Sprache Englisch
Identifikator ISSN: 2044-4753, 2044-4761
KITopen-ID: 1000125944
HGF-Programm 37.03.01 (POF III, LK 01) Catalysts and Mechanisms
Erschienen in Catalysis science & technology
Verlag Royal Society of Chemistry (RSC)
Band 11
Heft 1
Seiten 250-263
Projektinformation AmmOx (HGF, HGF IVF2016 TALENT, HRSF-0046)
Vorab online veröffentlicht am 10.11.2020
Nachgewiesen in Dimensions
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