Jagiellonian University Repository
On the location of iron and aluminium atoms in thermally activated AlMCM-58 and FeMCM-58 zeolites
Communities & Collections
pcg.skipToMenu
On the location of iron and aluminium atoms in thermally activated AlMCM-58 and FeMCM-58 zeolites
Bibliographic description
| title: | On the location of iron and aluminium atoms in thermally activated AlMCM-58 and FeMCM-58 zeolites |
| author: | Gil Barbara  , Marszałek Bartosz , Adamski Andrzej , Olejniczak Zbigniew, Kubů Martin, Čejka Jiří |
| journal title: | Microporous and Mesoporous Materials |
| volume: | 151 |
| date of publication : | 2012 |
| pages: | 339-345 |
| ISSN: |
1387-1811 |
| eISSN: |
1873-3093 |
| DOI: | |
| language: | English |
| journal language: | English |
| abstract in English: | FTIR study of iron and aluminium forms of zeolite MCM-58 showed that location of heteroatoms in this IFR structure depends on the type of heteroatom. The combination of the pyridine and CO adsorption allowed determination of the concentration of hydroxyls in the 12- and 5/6-rings. Both Fe and Al are gen- erating hydroxyls pointing towards either 12-ring or 5/6-rings but the former are located in positions giv- ing Si–OH–Fe hydroxyls pointing mainly to the 12-rings while the latter gives rise to the Si–OH–Al groups pointing primarily to the narrower 5- and 6-rings. (Al)MCM-58 undergoes only minor dehydroxylation associated with the acid sites even at tempera- tures as high as 700 ° C, which indicates unique stabilization of Al atoms in the IFR structure. In the case of (Fe)MCM-58, dehydroxylation is more extensive. Furthermore the OH located in the 5/6- rings dehydroxylate at lower temperatures than those in the 12-rings. The study also demonstrates that the concentration of the framework and extraframework iron atoms can be determined by a simple method based on pyridine adsorption followed by IR spectroscopy. |
| keywords in English: | MCM-58, IR, EPR and NMR spectroscopy, heteroatom location |
| departmental parameterization: | 35 |
| affiliation: | Wydział Chemii : Zakład Chemii Środowiska, Wydział Chemii : Zakład Chemii Nieorganicznej |
| type: | journal article |
| subtype: | academic paper |
Files in this item
| Files | Size | Format | View |
|---|---|---|---|
|
There are no files associated with this item. |
|||
This item appears in the following Collection(s)
Projekt „Repozytorium otwartego dostępu do dorobku naukowego i dydaktycznego UJ” współfinansowany w ramach poddziałania 2.3.1 „Cyfrowe udostępnianie zasobów nauki” Programu Operacyjnego Polska Cyfrowa z Europejskiego Funduszu Rozwoju Regionalnego i budżetu państwa na podstawie umowy o dofinansowanie nr POPC.02.03.01-00-0030/17-00
