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

doi:10.1016/j.apcata.2003.02.001

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

^*Corresponding author for this work

King Fahd University of Petroleum & Minerals

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

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 language	English
Pages (from-to)	1-6
Number of pages	6
Journal	Applied Catalysis A: General
Volume	257
Issue number	1
DOIs	https://doi.org/10.1016/j.apcata.2003.02.001
State	Published - 10 Jan 2004

Bibliographical note

Funding Information:
This work was partially supported by the US Department of Energy under contract number DE-AC03-76F00098. Jalil, Tabet and Faiz would like to thank KFUPM for its support.

Keywords

HPWO
IR
MCM-41
Tungstophosphoric acid
XANES
XPS

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology

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10.1016/j.apcata.2003.02.001

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@article{a421c8d0a8dc4d798614b970f0d37994,

title = "Surface investigation on thermal stability of tungstophosphoric acid supported on MCM-41 using synchrotron radiation",

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.",

keywords = "HPWO, IR, MCM-41, Tungstophosphoric acid, XANES, XPS",

author = "Jalil, {Pasl A.} and N. Tabet and M. Faiz and Hamdan, {N. M.} and Z. Hussain",

note = "Funding Information: This work was partially supported by the US Department of Energy under contract number DE-AC03-76F00098. Jalil, Tabet and Faiz would like to thank KFUPM for its support.",

year = "2004",

month = jan,

day = "10",

doi = "10.1016/j.apcata.2003.02.001",

language = "English",

volume = "257",

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journal = "Applied Catalysis A: General",

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T1 - Surface investigation on thermal stability of tungstophosphoric acid supported on MCM-41 using synchrotron radiation

AU - Jalil, Pasl A.

AU - Tabet, N.

AU - Faiz, M.

AU - Hamdan, N. M.

AU - Hussain, Z.

N1 - Funding Information: This work was partially supported by the US Department of Energy under contract number DE-AC03-76F00098. Jalil, Tabet and Faiz would like to thank KFUPM for its support.

PY - 2004/1/10

Y1 - 2004/1/10

N2 - 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.

AB - 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.

KW - HPWO

KW - IR

KW - MCM-41

KW - Tungstophosphoric acid

KW - XANES

KW - XPS

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DO - 10.1016/j.apcata.2003.02.001

M3 - Article

AN - SCOPUS:0346394261

SN - 0926-860X

VL - 257

SP - 1

EP - 6

JO - Applied Catalysis A: General

JF - Applied Catalysis A: General

IS - 1

ER -

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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