Szczegóły publikacji
Opis bibliograficzny
Monomeric Fe species in square planar geometry active for low temperature $NH_{3}‑SCR$ of NO / Dominik WIERZBICKI, Adam H. Clark, Oliver Kröcher, Davide Ferri, Maarten Nachtegaal // Journal of Physical Chemistry. C ; ISSN 1932-7447. — 2022 — vol. 126 iss. 41, s. 17510–17519. — Bibliogr. s. 17518–17519, Abstr. — Publikacja dostępna online od: 2022-10-05. — D. Wierzbicki - dod. afiliacja: Paul Scherer Institute, Villigen, Switzerland
Autorzy (5)
- AGHWierzbicki Dominik
- Clark Adam H.
- Kröcher Oliver
- Ferri Davide
- Nachtegaal Maarten
Dane bibliometryczne
| ID BaDAP | 143783 |
|---|---|
| Data dodania do BaDAP | 2023-03-31 |
| Tekst źródłowy | URL |
| DOI | 10.1021/acs.jpcc.2c03480 |
| Rok publikacji | 2022 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Journal of Physical Chemistry, C |
Abstract
Monomeric Fe species in zeolites are considered to be the active sites for the low temperature activity toward ammonia-assisted selective catalytic reduction of nitrogen oxides (NH3-SCR) in exhaust gases. Herein, we report on a preparation method to synthesize single-site Fe/ZSM-5 by combination of dealumination with the use of a bulky iron complex to introduce Fe. Transient in situ XAS experiments at the Fe K-edge under dynamic NH3-SCR reaction conditions demonstrated the involvement of all iron atoms in the redox cycle and, with that, suggest that Fe species in the studied Fe/ZSM-5 catalyst are monomers. Simulation of experimental X-ray absorption data revealed that the Fe species in the sample obtained by this approach adopt a square planar geometry, which changes into fivefold coordination at low temperature by strongly binding either NO or NH3as the ligand. The presence of monomeric Fe species in this Fe/ZSM-5 conveys molecular level insights into the temperature-dependent NH3-SCR activity and might prove useful in the study of other reactions over monomeric Fe species, such as methane partial oxidation or dehydroaromatization reactions.
