Szczegóły publikacji
Opis bibliograficzny
Influence of the nature and environment of manganese in Mn-BEA zeolites on NO conversion in selective catalytic reduction with ammonia / R. BARAN, L. Valentin, J. M. Krafft, T. GRZYBEK, P. Glatzel, S. Dzwigaj // Physical Chemistry Chemical Physics ; ISSN 1463-9076 . — 2017 — vol. 19 iss. 21, s. 13553–13561. — Bibliogr. s. 13560–13561. — Publikacja dostępna online od: 2017-05-17. — R. Baran - pierwsza afiliacja: ESRF – The European Synchrotron, Grenoble, France
Autorzy (6)
- AGHBaran Rafał
- Valentin Laetitia
- Krafft J. M.
- AGHGrzybek Teresa
- Glatzel Pieter
- Dźwigaj Stanisław
Dane bibliometryczne
| ID BaDAP | 119202 |
|---|---|
| Data dodania do BaDAP | 2019-04-12 |
| Tekst źródłowy | URL |
| DOI | 10.1039/c7cp02096a |
| Rok publikacji | 2017 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Physical Chemistry Chemical Physics |
Abstract
Manganese-containing BEA zeolites, Mn(x)SiBEA (x = 1-4 wt%) and Mn((I.E.))AlBEA, were prepared by a two-step post-synthesis method and a conventional wet ion-exchange, respectively, and applied as catalysts in the selective catalytic reduction of NO with ammonia (NH3-SCR). The physicochemical analysis of zeolite properties by high-energy-resolution fluorescence-detected XANES (HERFD-XANES) and X-ray emission spectroscopy (XES) uncovered that the coordination, geometry and oxidation state of Mn species are strongly related to the preparation method. Additionally, the study of catalyst acidity by FTIR spectroscopy with CO and pyridine probe molecules provided important insight into the number and type of acidic centres present on the catalyst surface. The catalytic results revealed that NO conversion depended on the state and content of Mn. The zeolites obtained by the two-step post-synthesis method and with a low Mn content were very active in the medium temperature range (NO conversion similar to 100%) with simultaneous high selectivity to N-2 due to the presence of isolated, framework Mn(III) and Mn(II) species. The N2O formation was especially high in the case of catalysts containing extra-framework polynuclear Mn species and negligible in the case of Mn-(I.E.) AlBEA containing predominantly isolated, extra-framework Mn(II) species.
