Flexibility of the MCM-41 structure: Pore expansion and wall-thickening in MCM-41 derivatives

D. Méhn, Z. Kónya, J. Halász, J. B. Nagy, B. Rác, A. Molnár, I. Kiricsi

Research output: Article

11 Citations (Scopus)

Abstract

Utilizing the flexibility of the structure of MCM-41 type mesoporous metal silicates pore size modification was successfully performed for some MCM-41 samples including materials which contain Al or Ti heteroatoms in the wall or organic modifiers covalently bounded to the wall. Changing, i.e. expanding or narrowing the pore diameter was made by post-synthesis treatments. The products of these procedures were characterized by XRD, BET, IR and 29Si MAS NMR techniques. For the expanded samples, a well characteristic thinning while for narrowed ones a definite thickening of pore walls, were established which were also accompanied by changes in the BET areas. The modified MCM-41 specimens retained their semi-crystalline character and the modification did not result in an increase of the concentration of structural imperfections.

Original languageEnglish
Pages (from-to)67-76
Number of pages10
JournalApplied Catalysis A: General
Volume232
Issue number1-2
DOIs
Publication statusPublished - jún. 10 2002

Fingerprint

Multicarrier modulation
Pore structure
Derivatives
Silicates
Pore size
Metals
Nuclear magnetic resonance
Crystalline materials
Defects
MCM-41

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

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abstract = "Utilizing the flexibility of the structure of MCM-41 type mesoporous metal silicates pore size modification was successfully performed for some MCM-41 samples including materials which contain Al or Ti heteroatoms in the wall or organic modifiers covalently bounded to the wall. Changing, i.e. expanding or narrowing the pore diameter was made by post-synthesis treatments. The products of these procedures were characterized by XRD, BET, IR and 29Si MAS NMR techniques. For the expanded samples, a well characteristic thinning while for narrowed ones a definite thickening of pore walls, were established which were also accompanied by changes in the BET areas. The modified MCM-41 specimens retained their semi-crystalline character and the modification did not result in an increase of the concentration of structural imperfections.",
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T2 - Pore expansion and wall-thickening in MCM-41 derivatives

AU - Méhn, D.

AU - Kónya, Z.

AU - Halász, J.

AU - Nagy, J. B.

AU - Rác, B.

AU - Molnár, A.

AU - Kiricsi, I.

PY - 2002/6/10

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N2 - Utilizing the flexibility of the structure of MCM-41 type mesoporous metal silicates pore size modification was successfully performed for some MCM-41 samples including materials which contain Al or Ti heteroatoms in the wall or organic modifiers covalently bounded to the wall. Changing, i.e. expanding or narrowing the pore diameter was made by post-synthesis treatments. The products of these procedures were characterized by XRD, BET, IR and 29Si MAS NMR techniques. For the expanded samples, a well characteristic thinning while for narrowed ones a definite thickening of pore walls, were established which were also accompanied by changes in the BET areas. The modified MCM-41 specimens retained their semi-crystalline character and the modification did not result in an increase of the concentration of structural imperfections.

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KW - MCM-41

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