Surface investigation on thermal stability of tungstophosphoric acid supported on MCM-41 using synchrotron radiation

Pasl A. Jalil, N. Tabet, M. Faiz, N. M. Hamdan, Z. Hussain

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The surface of supported tungstophosphoric acid H3PW 12O40 (HPW) on all-silica MCM-41 has been investigated using high-resolution X-ray photoelectron spectroscopy (XPS) and X-ray absorption near edge structure (XANES). The results show the interaction between HPW and MCM-41 upon impregnation. Nuclear magnetic resonance (NMR) spectroscopy results also seem to confirm the above conclusion. Heating the supported acid increased the structural damage of HPW and MCM-41. Our results also suggest the formation of tungsten oxides on the surface upon heat treatment at 400°C. A detailed analysis of the infrared (IR) spectra showed a gradual increase in the absorbance of the W-O-W corner shared vibration relative to the absorbance of the other bands. This indicates that the symmetry, and hence the stability of the bulk molecules were also decreased upon heating.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalApplied Catalysis A: General
Volume257
Issue number1
DOIs
Publication statusPublished - 10 Jan 2004

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Keywords

  • HPWO
  • IR
  • MCM-41
  • Tungstophosphoric acid
  • XANES
  • XPS

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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