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

Журнал ChemCatChem
ISSN: 1867-3880 , E-ISSN: 1867-3899
Вых. Данные Год: 2021, Том: 13, Номер: 1, Страницы: 313–327 Страниц : 15 DOI: 10.1002/cctc.202001320
Ключевые слова ammonia oxidation; platinum; alumina; dispersion; selectivity
Авторы 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
Организации
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

Информация о финансировании (1)

1 Российский научный фонд
Helmholtz Association of German Research Centres 		18-43-06201/HRSF-0046

Реферат: 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.
Библиографическая ссылка: 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 CAPlus OpenAlex
Даты:
Поступила в редакцию: 14 авг. 2020 г.
Принята к публикации: 28 сент. 2020 г.
Опубликована online: 28 окт. 2020 г.
Опубликована в печати: 12 янв. 2021 г.
Идентификаторы БД:
Web of science: WOS:000587049000001
Scopus: 2-s2.0-85094122840
РИНЦ: 45196233
Chemical Abstracts: 2020:2190954
OpenAlex: W3087999168
Цитирование в БД:
БД Цитирований
Scopus 27
Web of science 26
РИНЦ 25
OpenAlex 29
Альметрики: