Highly dispersed heteropolyacids supported on modified MCM 41 mesoporous materials

A. Popa, V. Sasca, E. E. Kiš, Radmila Marinković-Nedučin, J. Halász

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Solid acid catalysts consisting of heteropolyacids (HPAs) H 3PMo12O40 (HPM) and H4PVMo 11O40 (HPVM) supported on mesoporous pure-silica molecular sieve MCM-41 and modified molecular sieves Al-MCM-41 and Fe-MCM-41 have been prepared and characterized by XRD, FT-IR, 31P MAS NMR, low temperature nitrogen adsorption and scanning electron microscopy. All supported HPAs were prepared by impregnation using the incipient wetness techniques with a mixture water: etnanol = 1:1. FT-IR studies showed that HPAs anions preserved their Keggin structure after deposition on pure and modified molecular sieves supports. X-ray diffraction and SEM studies confirmed the uniformity of the distribution of active phase in the supported samples. The values of specific surface area of both HPAs were increased by deposition on molecular sieve supports. It is found that most of HPM and HPVM (active phases) in supported samples are well dispersed on the support and MCM-41 supported HPAs still keep its Keggin structure. The surface morphology of the MCM-41 supported samples is almost similar to that of MCM-41 support. A relatively uniform distribution of active phase in the support pores was evidenced by EDS analysis.

Original languageEnglish
Pages (from-to)1401-1407
Number of pages7
JournalJournal of Optoelectronics and Advanced Materials
Volume10
Issue number6
Publication statusPublished - Jun 2008

Fingerprint

Mesoporous materials
Multicarrier modulation
absorbents
Molecular sieves
scanning electron microscopy
moisture content
Scanning electron microscopy
silicon dioxide
anions
porosity
nitrogen
catalysts
Impregnation
Specific surface area
Silicon Dioxide
nuclear magnetic resonance
acids
adsorption
Anions
Surface morphology

Keywords

  • P MAS NMR
  • BET
  • Heteropolyacids
  • Molecular sieves
  • SEM
  • Structure
  • Texture
  • XRD

ASJC Scopus subject areas

  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physics and Astronomy (miscellaneous)

Cite this

Highly dispersed heteropolyacids supported on modified MCM 41 mesoporous materials. / Popa, A.; Sasca, V.; Kiš, E. E.; Marinković-Nedučin, Radmila; Halász, J.

In: Journal of Optoelectronics and Advanced Materials, Vol. 10, No. 6, 06.2008, p. 1401-1407.

Research output: Contribution to journalArticle

Popa, A. ; Sasca, V. ; Kiš, E. E. ; Marinković-Nedučin, Radmila ; Halász, J. / Highly dispersed heteropolyacids supported on modified MCM 41 mesoporous materials. In: Journal of Optoelectronics and Advanced Materials. 2008 ; Vol. 10, No. 6. pp. 1401-1407.
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