Characterization of mesoporous VO x /MCM-41 composite materials obtained via post-synthesis impregnation

Saeed B. Bukallah, Ali Bumajdad, Kamal M.S. Khalil, Mohamed I. Zaki

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Spherical-particle MCM-41 was synthesized at room temperature, and, then, impregnated with aqueous solutions of NH 4 VO 3 to produce variously loaded VO x /MCM-41 composite materials. Bulk and surface properties of the materials thus produced were characterized by means of X-ray powder diffractometry (XRD), infrared spectroscopy (FTIR), N 2 sorptiometry and X-ray photoelectron spectroscopy (XPS). Results obtained indicated that subsequent calcination at 550 °C (for 2 h) of the blank and impregnated MCM-41 particles, results in materials assuming the same bulk structure of MCM-41, and exposing uniformly mesporous, high area surfaces (P w = 2.0-2.3 nm; 974-829 m 2 /g), except for the material obtained at 20 wt%-V 2 O 5 that was shown to suffer a considerable loss on surface area (down to 503 m 2 /g). XPS results implied that the immobilization of the VO x species occurs via interaction with surface OH/H 2 O groups of MCM-41, leading to the formation of vanadate (VO 3 - ) surface species, as well as minor V-O-Si and V 2 O 5 -like species. However, in all cases, the vanadium sites remained pentavalent and exposed on the surface.

Original languageEnglish
Pages (from-to)6179-6185
Number of pages7
JournalApplied Surface Science
Volume256
Issue number21
DOIs
Publication statusPublished - Aug 15 2010

Keywords

  • MCM-41
  • Mesoporous
  • VO /MCM-41 composites
  • X-ray diffractometry
  • X-ray photelectron spectroscopy

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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