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Immobilization of 12-molybdophosphoric and 12-tungstophosphoric acids on metal-substituted hexagonal mesoporous silica

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Title: Immobilization of 12-molybdophosphoric and 12-tungstophosphoric acids on metal-substituted hexagonal mesoporous silica
Authors: Damyanova, S.1 soniad@satline.net, Dimitrov, L.1, Mariscal, R.2, Fierro, J.L.G.2, Petrov, L.1, Sobrados, I.3
Source: Applied Catalysis A: General. Dec2003, Vol. 256 Issue 1/2, p183. 15p.
Subjects: Silicates, Cations, Acids, Aluminum
Abstract: Hexagonal mesoporous silicate (HMS) materials containing Ti, Zr and Al ions were prepared using the neutral template route. The effect of the cation on the immobilization of 12-molybdophosphoric and 12-tungstophosphoric acids on mesoporous materials was studied. The texture of the samples was studied by the N2 adsorption–desorption isotherms, and their structure by X-ray diffraction (XRD), UV-Vis diffuse reflectance (DRS), infrared (IR) and X-ray photoelectron spectroscopy (XPS), and 1H and 31P nuclear magnetic resonance (NMR). Incorporation of different metals into the framework of HMS led to change in the structural and surface properties of mesoporous silica. All metal-containing samples showed a lower surface area compared to that of pure silica. The introduction of Zr and Al cations led to the development of textural mesoporosity in addition to the framework mesoporosity, characteristic of HMS and Ti-containing mesoporous silica (TiHMS) materials. IR and 1H and 31P NMR spectroscopic data revealed that the species present on the surface of HMS and TiHMS mesoporous materials after impregnation with solutions of 12-molybdophosphoric and 12-tungstophosphoric acid are non-degraded heteropoly anions with a preserved Keggin unit. Partial degradation of the anion was observed for zirconium-containing silicate samples (ZrHMS)-supported acids, the extent of which was stronger for supported molybdophosphoric acid in comparison with that of tungstophosphoric acid. [Copyright &y& Elsevier]
Copyright of Applied Catalysis A: General is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 11466150
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  Label: Title
  Group: Ti
  Data: Immobilization of 12-molybdophosphoric and 12-tungstophosphoric acids on metal-substituted hexagonal mesoporous silica
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  Data: <searchLink fieldCode="AR" term="%22Damyanova%2C+S%2E%22">Damyanova, S.</searchLink><relatesTo>1</relatesTo><i> soniad@satline.net</i><br /><searchLink fieldCode="AR" term="%22Dimitrov%2C+L%2E%22">Dimitrov, L.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Mariscal%2C+R%2E%22">Mariscal, R.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Fierro%2C+J%2EL%2EG%2E%22">Fierro, J.L.G.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Petrov%2C+L%2E%22">Petrov, L.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Sobrados%2C+I%2E%22">Sobrados, I.</searchLink><relatesTo>3</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Catalysis+A%3A+General%22">Applied Catalysis A: General</searchLink>. Dec2003, Vol. 256 Issue 1/2, p183. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Silicates%22">Silicates</searchLink><br /><searchLink fieldCode="DE" term="%22Cations%22">Cations</searchLink><br /><searchLink fieldCode="DE" term="%22Acids%22">Acids</searchLink><br /><searchLink fieldCode="DE" term="%22Aluminum%22">Aluminum</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Hexagonal mesoporous silicate (HMS) materials containing Ti, Zr and Al ions were prepared using the neutral template route. The effect of the cation on the immobilization of 12-molybdophosphoric and 12-tungstophosphoric acids on mesoporous materials was studied. The texture of the samples was studied by the N2 adsorption–desorption isotherms, and their structure by X-ray diffraction (XRD), UV-Vis diffuse reflectance (DRS), infrared (IR) and X-ray photoelectron spectroscopy (XPS), and <F>1H</F> and <F>31P</F> nuclear magnetic resonance (NMR). Incorporation of different metals into the framework of HMS led to change in the structural and surface properties of mesoporous silica. All metal-containing samples showed a lower surface area compared to that of pure silica. The introduction of Zr and Al cations led to the development of textural mesoporosity in addition to the framework mesoporosity, characteristic of HMS and Ti-containing mesoporous silica (TiHMS) materials. IR and <F>1H</F> and <F>31P</F> NMR spectroscopic data revealed that the species present on the surface of HMS and TiHMS mesoporous materials after impregnation with solutions of 12-molybdophosphoric and 12-tungstophosphoric acid are non-degraded heteropoly anions with a preserved Keggin unit. Partial degradation of the anion was observed for zirconium-containing silicate samples (ZrHMS)-supported acids, the extent of which was stronger for supported molybdophosphoric acid in comparison with that of tungstophosphoric acid. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Applied Catalysis A: General is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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              Text: Dec2003
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