Stabilization of iron in micro- and mesoporous ferrisilicates (MFI, MCM-22, SBA-15, and MCM-41) as detected by in situ Mössbauer spectroscopy

K. Lázár, A. Szegedi, F. Martinez, R. Molina, P. Fejes

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Iron containing micro-and mesoporous substances were exposed to various treatments and changes in coordination and oxidation states of iron are analysed. ZSM-5 (Si/Fe = 200) and MCM-22 (Si/Fe = 13.5) are applied as microporous hosts. Most of iron is stabilized in tetrahedral framework positions in the first structure, whereas profound rearrangements may proceed on iron with simultaneous redox processes in the second host. SBA-15 (Si/Fe = 76) and MCM-41 (Si/Fe = 50) were selected as mesoporous matrices. The partly amorphous feature of the pore walls is reflected in coordinations occupied by iron. Fe3+ ↔ Fe2+ reversible redox transformations may proceed in large part of iron. Further, novel types of coordinations appear which cannot be detected in microporous hosts.

Original languageEnglish
Pages (from-to)733-740
Number of pages8
JournalStudies in Surface Science and Catalysis
Volume158 A
Publication statusPublished - 2005

Fingerprint

Multicarrier modulation
Iron
Stabilization
stabilization
Spectroscopy
iron
spectroscopy
MCM-41
SBA-15
porosity
Oxidation
oxidation
matrices

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Catalysis

Cite this

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abstract = "Iron containing micro-and mesoporous substances were exposed to various treatments and changes in coordination and oxidation states of iron are analysed. ZSM-5 (Si/Fe = 200) and MCM-22 (Si/Fe = 13.5) are applied as microporous hosts. Most of iron is stabilized in tetrahedral framework positions in the first structure, whereas profound rearrangements may proceed on iron with simultaneous redox processes in the second host. SBA-15 (Si/Fe = 76) and MCM-41 (Si/Fe = 50) were selected as mesoporous matrices. The partly amorphous feature of the pore walls is reflected in coordinations occupied by iron. Fe3+ ↔ Fe2+ reversible redox transformations may proceed in large part of iron. Further, novel types of coordinations appear which cannot be detected in microporous hosts.",
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TY - JOUR

T1 - Stabilization of iron in micro- and mesoporous ferrisilicates (MFI, MCM-22, SBA-15, and MCM-41) as detected by in situ Mössbauer spectroscopy

AU - Lázár, K.

AU - Szegedi, A.

AU - Martinez, F.

AU - Molina, R.

AU - Fejes, P.

PY - 2005

Y1 - 2005

N2 - Iron containing micro-and mesoporous substances were exposed to various treatments and changes in coordination and oxidation states of iron are analysed. ZSM-5 (Si/Fe = 200) and MCM-22 (Si/Fe = 13.5) are applied as microporous hosts. Most of iron is stabilized in tetrahedral framework positions in the first structure, whereas profound rearrangements may proceed on iron with simultaneous redox processes in the second host. SBA-15 (Si/Fe = 76) and MCM-41 (Si/Fe = 50) were selected as mesoporous matrices. The partly amorphous feature of the pore walls is reflected in coordinations occupied by iron. Fe3+ ↔ Fe2+ reversible redox transformations may proceed in large part of iron. Further, novel types of coordinations appear which cannot be detected in microporous hosts.

AB - Iron containing micro-and mesoporous substances were exposed to various treatments and changes in coordination and oxidation states of iron are analysed. ZSM-5 (Si/Fe = 200) and MCM-22 (Si/Fe = 13.5) are applied as microporous hosts. Most of iron is stabilized in tetrahedral framework positions in the first structure, whereas profound rearrangements may proceed on iron with simultaneous redox processes in the second host. SBA-15 (Si/Fe = 76) and MCM-41 (Si/Fe = 50) were selected as mesoporous matrices. The partly amorphous feature of the pore walls is reflected in coordinations occupied by iron. Fe3+ ↔ Fe2+ reversible redox transformations may proceed in large part of iron. Further, novel types of coordinations appear which cannot be detected in microporous hosts.

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