Synthesis, characterisation and catalytic applications of sol-gel derived silica-phosphotungstic acid composites

Á. Kukovecz, Zs Balogi, Z. Kónya, M. Toba, P. Lentz, S. I. Niwa, F. Mizukami, Á Molnár, J. B. Nagy, I. Kiricsi

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

Phosphotungstic acid (HPWA)-silica composites were synthesised upto 80 wt.% HPWA loading both by conventional impregnation and sol-gel incorporation techniques. The samples were characterised by BET, XRD, NMR, FT-IR and TG. A comprehensive study on the effect of HPWA loading on the acidity has been performed using pyridine adsorption, NH3 TPD and a catalytic test reaction. The samples containing 50 wt.% HPWA showed the best overall performance. Although, the acidic properties of the impregnated catalysts were superior to their sol-gel counterparts, stability measurements (XRD, FT-IR and test reaction) performed before and after washing the samples with H2O/EtOH mixture have unambiguously proved that the sol-gel derived composites are more suitable for the purposes of heterogeneous catalysis.

Original languageEnglish
Pages (from-to)83-94
Number of pages12
JournalApplied Catalysis A: General
Volume228
Issue number1-2
DOIs
Publication statusPublished - 2002

Fingerprint

Phosphotungstic Acid
Silicon Dioxide
Sol-gels
Silica
Acids
Composite materials
Temperature programmed desorption
Washing
Acidity
Impregnation
Pyridine
Catalysis
Nuclear magnetic resonance
Adsorption
Catalysts

Keywords

  • Acidity (optimisation of)
  • Catalyst stability
  • Phosphotungstic acid
  • Silica
  • Sol-gel method

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Synthesis, characterisation and catalytic applications of sol-gel derived silica-phosphotungstic acid composites. / Kukovecz, Á.; Balogi, Zs; Kónya, Z.; Toba, M.; Lentz, P.; Niwa, S. I.; Mizukami, F.; Molnár, Á; Nagy, J. B.; Kiricsi, I.

In: Applied Catalysis A: General, Vol. 228, No. 1-2, 2002, p. 83-94.

Research output: Contribution to journalArticle

Kukovecz, Á. ; Balogi, Zs ; Kónya, Z. ; Toba, M. ; Lentz, P. ; Niwa, S. I. ; Mizukami, F. ; Molnár, Á ; Nagy, J. B. ; Kiricsi, I. / Synthesis, characterisation and catalytic applications of sol-gel derived silica-phosphotungstic acid composites. In: Applied Catalysis A: General. 2002 ; Vol. 228, No. 1-2. pp. 83-94.
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AU - Kukovecz, Á.

AU - Balogi, Zs

AU - Kónya, Z.

AU - Toba, M.

AU - Lentz, P.

AU - Niwa, S. I.

AU - Mizukami, F.

AU - Molnár, Á

AU - Nagy, J. B.

AU - Kiricsi, I.

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