Insight into the Nature of Active Species of Pt/Al2O3 Catalysts for Low Temperature NH3 Oxidation | Sciact - CRIS-system of Boreskov Institute of Catalysis

Insight into the Nature of Active Species of Pt/Al2O3 Catalysts for Low Temperature NH3 Oxidation Full article

Journal

ChemCatChem
ISSN: 1867-3880 , E-ISSN: 1867-3899

Output data

Year: 2020, Volume: 12, Number: 3, Pages: 867-880 Pages count : 13 DOI: 10.1002/cctc.201901719

Tags

ammonia slip catalyst; NH3; operando spectroscopy; platinum; Pt/Al2O3

Authors

Svintsitskiy Dmitry A. ^1,2 , Kibis Lidiya S. ^1,2 , Stadnichenko Andrey I. ^1,2 , Slavinskaya Elena M. ^1,2 , Romanenko Anatoly V. ¹ , Fedorova Elizaveta A. ¹ , Stonkus Olga A. ^1,2 , Doronkin Dmitry E. ^3,4 , Marchuk Vasyl ³ , Zimina Anna ^3,4 , Casapu Maria ³ , Grunwaldt Jan‐Dierk ^3,4 , Boronin Andrei I. ^1,2

Affiliations

1	Boreskov Institute of Catalysis, Pr. Lavrentieva 5, Novosibirsk, 630090, Russia
2	Novosibirsk State University, Pirogova St. 2, Novosibirsk, 630090, Russia
3	Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstr. 20, Karlsruhe, 76131, Germany
4	Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany

Funding (1)

Russian Science Foundation
Helmholtz Association of German Research Centres

18-43-06201/HRSF-0046

Two series of Pt/γ‐Al2O3 catalysts for low temperature NH3 oxidation were prepared using Pt(NO3)4 and H2PtCl6 precursors. Using both precursors results in the formation of small Pt particles (d<1.5 nm), however, Cl‐containing Pt precursors give a higher fraction of highly dispersed Pt species. Such species show high stability against thermal or H2 treatment probably due to the presence of a substantial amount of chlorine on the surface. Treatment of the samples prepared from Pt(NO3)4 with H2 leads to the formation of metallic Pt nanoparticles accompanied by the improvement of catalytic activity in NH3 oxidation at T<200 °C. The main products of ammonia oxidation at temperatures below 250 °C were molecular nitrogen and nitrous oxide with the N2 selectivity reaching 80 %. Operando XANES/EXAFS revealed that even after H2 pretreatment at least 40 % of Pt surface remains in oxidized state under reaction conditions resulting in the appearance of N2O as a by‐product.

Svintsitskiy D.A. , Kibis L.S. , Stadnichenko A.I. , Slavinskaya E.M. , Romanenko A.V. , Fedorova E.A. , Stonkus O.A. , Doronkin D.E. , Marchuk V. , Zimina A. , Casapu M. , Grunwaldt J. , Boronin A.I.
Insight into the Nature of Active Species of Pt/Al2O3 Catalysts for Low Temperature NH3 Oxidation

ChemCatChem. 2020. V.12. N3. P.867-880. DOI: 10.1002/cctc.201901719 WOS Scopus РИНЦ ANCAN OpenAlex

Full text from publisher

Submitted:	Sep 11, 2019
Accepted:	Oct 15, 2019
Published online:	Nov 26, 2019
Published print:	Feb 6, 2020

Web of science:	WOS:000499267600001
Scopus:	2-s2.0-85075913520
Elibrary:	43208280
Chemical Abstracts:	2019:2226028
Chemical Abstracts (print):	172:217150
OpenAlex:	W2981049182

DB	Citing
Scopus	57
Web of science	53
Elibrary	50
OpenAlex	61