Study of the Fe/zeolite-L system: Part I: Characterization of iron species and their structural properties
Zeolite-L in potassic (ZLK) and acidic (ZLH) forms were used as a support for iron species to obtain two solids, called Fe/ZLK and Fe/ZLH, respectively. “In situ” Mössbauer spectroscopy (MS) between room temperature (RT) and 15 K, volumetric oxidation (VO) and thermogravimetric analyses were used to...
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Published in | Applied surface science Vol. 165; no. 2; pp. 91 - 99 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
22.09.2000
Elsevier Science |
Subjects | |
Online Access | Get full text |
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Summary: | Zeolite-L in potassic (ZLK) and acidic (ZLH) forms were used as a support for iron species to obtain two solids, called Fe/ZLK and Fe/ZLH, respectively. “In situ” Mössbauer spectroscopy (MS) between room temperature (RT) and 15 K, volumetric oxidation (VO) and thermogravimetric analyses were used to determine the iron species existent after reduction (Fe
0, Fe
2+ and Fe
3O
4) and to study their structural properties. In both solids, a similar fraction of very small Fe
0 crystals was found inside the zeolite channels. Intermediate species, like exchanged Fe
2+, were also detected in both samples. It was possible to determine that Fe
2+ ions are located at sites D in Fe/ZLK and sites A in Fe/ZLH. Soft reduction conditions, like slow temperature raise (2 K/min), allowed to maintain metallic Fe crystals inside the zeolite-L structure in contrast with other Fe/zeolite systems. |
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ISSN: | 0169-4332 1873-5584 |
DOI: | 10.1016/S0169-4332(00)00364-0 |