Probing the Nature of Active Centers in Pt–Cu/TiO2 Catalysts for Selective Ammonia Oxidation | Sciact - CRIS-система Института катализа

Probing the Nature of Active Centers in Pt–Cu/TiO2 Catalysts for Selective Ammonia Oxidation Научная публикация

Журнал

The Journal of Physical Chemistry C
ISSN: 1932-7447 , E-ISSN: 1932-7455

Вых. Данные

Год: 2024, Том: 128, Номер: 44, DOI: 10.1021/acs.jpcc.4c06021

Ключевые слова

Bioremediation; Catalytic oxidation; Copper; High resolution transmission electron microscopy; Platinum; Platinum compounds; Redox reactions; X ray diffraction analysis

Авторы

Kibis Lidiya S. ¹ , Ovsyuk Ivan Yu ^1,2 , Popov Anton A. ³ , Svintsitskiy Dmitry A. ¹ , Slavinskaya Elena M. ¹ , Stonkus Olga A. ¹ , Korenev Sergey V. ³ , Boronin Andrei I. ¹

Организации

1	Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
2	Novosibirsk State University, Novosibirsk 630090, Russia
3	Nikolaev Institute of Inorganic Chemistry, Novosibirsk 630090, Russia

Информация о финансировании (1)

Российский научный фонд

23-23-00322

The activity and selectivity of catalytic systems are influenced by many important factors, such as the composition of the surface, the size and structure of the active sites, as well as the oxidation state of the active components. In this study, we investigated the nature of the active components in Pt/TiO2 catalysts for selective ammonia oxidation upon their modification with copper. Analysis using X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) revealed that an increase in copper content led to a significant dispersion of platinum particles due to the formation of subnanoscale Pt(Cu)Ox species. Application of temperature-programmed reduction (TPR-H2) and X-ray photoelectron spectroscopy (XPS) techniques provided valuable data on the redox properties of the catalysts. The introduction of copper resulted in a notable increase in the fraction of oxidized platinum. Once reduced, platinum in the composition of the Pt–Cu/TiO2 catalysts was easily reoxidized upon subsequent exposure to oxygen already at room temperature. The Pt–Cu/TiO2 catalysts comprised oxidized copper species, which demonstrated more labile redox behavior at lower temperatures compared to the Cu/TiO2 catalyst. The facilitated redox transitions of the active components contributed to the enhanced selectivity of the Pt–Cu/TiO2 samples toward N2 by affecting the reaction mechanism. The obtained results provide new insights into key aspects governing the effective oxidation of slip ammonia at low temperatures.

Kibis L.S. , Ovsyuk I.Y. , Popov A.A. , Svintsitskiy D.A. , Slavinskaya E.M. , Stonkus O.A. , Korenev S.V. , Boronin A.I.
Probing the Nature of Active Centers in Pt–Cu/TiO2 Catalysts for Selective Ammonia Oxidation
The Journal of Physical Chemistry C. 2024. V.128. N44. DOI: 10.1021/acs.jpcc.4c06021 WOS Scopus OpenAlex

Поступила в редакцию:	5 сент. 2024 г.
Принята к публикации:	22 окт. 2024 г.
Опубликована online:	29 окт. 2024 г.
Опубликована в печати:	7 нояб. 2024 г.

Web of science:	WOS:001347186800001
Scopus:	2-s2.0-85208278042
OpenAlex:	W4403855236

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