An FT-IR and UV-VIS study on the structure and acidity of sol-gel derived silica foams

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19 Citations (Scopus)

Abstract

Novel acidic macrostructured mesoporous silica foams were synthesised by the sol-gel method. The structure of the samples was investigated by IR and UV-VIS spectroscopy, and their acidity was measured by pyridine adsorption. Lewis and Broensted acidic centres were formed both in the silica-tungsto-phosphoric acid and in the silica-alumina composite foams. The amount of acid sites can be tuned by sample pre-treatment as well as changing the heteropoly acid loading or the Si/Al ratio of the foam, respectively. Because of the exceptionally high diffusion rates offered by the foam structure, the synthesised materials are expected to make an influence on the field of liquid phase heterogeneous catalysis in the future.

Original languageEnglish
Pages (from-to)409-412
Number of pages4
JournalJournal of Molecular Structure
Volume563-564
DOIs
Publication statusPublished - May 28 2001

Fingerprint

Silica Gel
Polymethyl Methacrylate
Acidity
acidity
foams
Silicon Dioxide
Sol-gels
Foams
gels
silicon dioxide
Acids
Aluminum Oxide
Catalysis
acids
Adsorption
phosphoric acid
Spectrum Analysis
Ultraviolet spectroscopy
Gels
pretreatment

Keywords

  • Acidity
  • FT-IR spectroscopy
  • Silica foam
  • Sol-gel method
  • Tungsto-phosphoric acid

ASJC Scopus subject areas

  • Structural Biology
  • Organic Chemistry
  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

Cite this

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abstract = "Novel acidic macrostructured mesoporous silica foams were synthesised by the sol-gel method. The structure of the samples was investigated by IR and UV-VIS spectroscopy, and their acidity was measured by pyridine adsorption. Lewis and Broensted acidic centres were formed both in the silica-tungsto-phosphoric acid and in the silica-alumina composite foams. The amount of acid sites can be tuned by sample pre-treatment as well as changing the heteropoly acid loading or the Si/Al ratio of the foam, respectively. Because of the exceptionally high diffusion rates offered by the foam structure, the synthesised materials are expected to make an influence on the field of liquid phase heterogeneous catalysis in the future.",
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AU - Kukovecz, Á.

AU - Kónya, Z.

AU - Kiricsi, I.

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N2 - Novel acidic macrostructured mesoporous silica foams were synthesised by the sol-gel method. The structure of the samples was investigated by IR and UV-VIS spectroscopy, and their acidity was measured by pyridine adsorption. Lewis and Broensted acidic centres were formed both in the silica-tungsto-phosphoric acid and in the silica-alumina composite foams. The amount of acid sites can be tuned by sample pre-treatment as well as changing the heteropoly acid loading or the Si/Al ratio of the foam, respectively. Because of the exceptionally high diffusion rates offered by the foam structure, the synthesised materials are expected to make an influence on the field of liquid phase heterogeneous catalysis in the future.

AB - Novel acidic macrostructured mesoporous silica foams were synthesised by the sol-gel method. The structure of the samples was investigated by IR and UV-VIS spectroscopy, and their acidity was measured by pyridine adsorption. Lewis and Broensted acidic centres were formed both in the silica-tungsto-phosphoric acid and in the silica-alumina composite foams. The amount of acid sites can be tuned by sample pre-treatment as well as changing the heteropoly acid loading or the Si/Al ratio of the foam, respectively. Because of the exceptionally high diffusion rates offered by the foam structure, the synthesised materials are expected to make an influence on the field of liquid phase heterogeneous catalysis in the future.

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KW - Silica foam

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