In situ Probing of Pt/TiO2 Activity in Low-Temperature Ammonia Oxidation | Sciact - CRIS-system of Boreskov Institute of Catalysis

In situ Probing of Pt/TiO2 Activity in Low-Temperature Ammonia Oxidation Full article

Journal

Catalysis Science and Technology
ISSN: 2044-4753 , E-ISSN: 2044-4761

Output data

Year: 2021, Volume: 11, Number: 1, Pages: 250-263 Pages count : 14 DOI: 10.1039/d0cy01533d

Tags

METAL-SUPPORT INTERACTION; LASER-ABLATED NANOPARTICLES; THERMAL-STABILITY; PARTICLE-SIZE; CO OXIDATION; Pt/Al2O3 CATALYSTS; PLATINUM OXIDES; ATOMIC OXYGEN; DOPED TIO2; NH3

Authors

Kibis Lidiya S. ¹ , Svintsitskiy Dmitry A. ¹ , Stadnichenko Andrey I. ¹ , Slavinskaya Elena M. ¹ , Romanenko Anatoly V. ¹ , Fedorova Elizaveta A. ¹ , Stonkus Olga A. ¹ , Svetlichnyi Valery A. ² , Fakhrutdinova Elena D. ² , Vorokhta Mykhailo ³ , Šmíd Břetislav ³ , Doronkin Dmitry E. ^4,5 , Marchuk Vasyl ⁴ , Grunwaldt Jan-Dierk ^4,5 , Boronin Andrei I. ¹

Affiliations

1	Boreskov Institute of Catalysis, pr. Lavrentieva 5, Novosibirsk, Russia
2	Tomsk State University, pr. Lenina 36, Tomsk, Russia
3	Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, Prague 8, Czech Republic
4	Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology, Engesserstr. 20, Karlsruhe, Germany
5	Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, Germany

Funding (1)

Russian Science Foundation
Helmholtz Association of German Research Centres

18-43-06201/HRSF-0046

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/TiO2 catalysts in ammonia oxidation (NH3 + O2 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 NH3 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 PtOx surface layers or PtO/PtO2 oxides during NH3 + O2 reaction. Despite the differences in the oxidation state of platinum in the as-prepared catalysts, their treatment in the reaction mixture results in the formation of metallic platinum particles, which can serve as centers for stabilization of the adsorbed oxygen species. Stabilization of the bulk platinum oxide structures in the Pt/TiO2 catalysts seems to be less favorable due to the metal–support interaction.

Kibis L.S. , Svintsitskiy D.A. , Stadnichenko A.I. , Slavinskaya E.M. , Romanenko A.V. , Fedorova E.A. , Stonkus O.A. , Svetlichnyi V.A. , Fakhrutdinova E.D. , Vorokhta M. , Šmíd B. , Doronkin D.E. , Marchuk V. , Grunwaldt J-D. , Boronin A.I.
In situ Probing of Pt/TiO2 Activity in Low-Temperature Ammonia Oxidation
Catalysis Science and Technology. 2021. V.11. N1. P.250-263. DOI: 10.1039/d0cy01533d WOS Scopus РИНЦ AN OpenAlex

Submitted:	Jul 31, 2020
Accepted:	Nov 4, 2020
Published online:	Nov 10, 2020
Published print:	Jan 7, 2021

Web of science:	WOS:000609012400020
Scopus:	2-s2.0-85099751079
Elibrary:	44991327
Chemical Abstracts:	2020:2282676
OpenAlex:	W3103606847

DB	Citing
Scopus	34
Web of science	29
Elibrary	31
OpenAlex	34