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The Effects of Platinum Dispersion and Pt State on Catalytic Properties of Pt/Al2O3 in NH3 Oxidation Full article

Journal ChemCatChem
ISSN: 1867-3880 , E-ISSN: 1867-3899
Output data Year: 2021, Volume: 13, Number: 1, Pages: 313–327 Pages count : 15 DOI: 10.1002/cctc.202001320
Tags ammonia oxidation; platinum; alumina; dispersion; selectivity
Authors Slavinskaya Elena M. 1 , Kibis Lidiya S. 1 , Stonkus Olga A. 1 , Svintsitskiy Dmitry A. 1 , Stadnichenko Andrei I. 1 , Fedorova Elizaveta A. 1 , Romanenko Anatolii V. 1 , Marchuk Vasyl 2 , Doronkin Dmitry E. 2,3 , Boronin Andrei I. 1
Affiliations
1 Boreskov Institute of Catalysis SB RAS, Pr. Lavrentieva 5, 630090 Novosibirsk, Russia
2 Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstr. 20, 76131 Karlsruhe, Germany
3 Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany

Funding (1)

1 Russian Science Foundation
Helmholtz Association of German Research Centres 		18-43-06201/HRSF-0046

Abstract: Dependence of NH3 oxidation on the state and dispersion of Pt species in Pt/γ‐Al2O3 catalysts was investigated. Prereduced Pt/γ‐Al2O3 catalysts containing Pt0 nanoparticles exhibited significantly higher activity than preoxidized ones with the same Pt dispersion. The most significant improvement of the catalytic activity (TOF increased by 30 times) was observed when the size of Pt0 particles increased from ∼1 to ∼8 nm. N2 selectivity was found to be mainly determined by the reaction temperature, with a minor influence of Pt particle size. Preoxidized catalysts containing ionic Pt were activated by the reaction medium, while partial deactivation was observed for the prereduced ones. The activity improvement was associated with the presence of Pt4+/Pt2+ species on the surface of preoxidized catalysts. The activity decrease of the prereduced catalysts was due to the partial oxidation and subsequent redispersion of Pt particles. Introduction of H2O and CO2 to the reaction mixture only moderately influenced NH3 oxidation activity shifting NH3 conversion curves by about +15 °C.
Cite: Slavinskaya E.M. , Kibis L.S. , Stonkus O.A. , Svintsitskiy D.A. , Stadnichenko A.I. , Fedorova E.A. , Romanenko A.V. , Marchuk V. , Doronkin D.E. , Boronin A.I.
The Effects of Platinum Dispersion and Pt State on Catalytic Properties of Pt/Al2O3 in NH3 Oxidation
ChemCatChem. 2021. V.13. N1. P.313–327. DOI: 10.1002/cctc.202001320 WOS Scopus РИНЦ AN OpenAlex
Dates:
Submitted: Aug 14, 2020
Accepted: Sep 28, 2020
Published online: Oct 28, 2020
Published print: Jan 12, 2021
Identifiers:
Web of science: WOS:000587049000001
Scopus: 2-s2.0-85094122840
Elibrary: 45196233
Chemical Abstracts: 2020:2190954
OpenAlex: W3087999168
Citing:
DB Citing
Scopus 27
Web of science 26
Elibrary 25
OpenAlex 29
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