Characterization of Mo-P-alumina sol-gel catalysts by solid-state 31P and 27Al magic-angle spinning nuclear magnetic resonance and two-dimensional 27Al multiple-quantum magic-angle spinning nuclear magnetic resonance

Article Abstract:

Molybdenum oxide-phosphorus oxide-alumina sol-gel hydrotreating catalysts were characterized using solid-state 31P and 27Al magic-angle spinning (MAS) nuclear magnetic resonance (NMR) and two-dimensional 27Al multiple-quantum MAS NMR. The amount of phosphorous and the nature of the P precursors were found to significantly affect the catalysts. The P in the dried catalysts was found to be supported as monomeric or polymeric P oxospecies when using H3PO4. In calcined samples, the H3PO4 precursor leads to the formation of the AlPO4 phase.

Catalysts, Complex compounds, Coordination compounds

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Mesoporous metal oxide semiconductor-clad waveguides

Article Abstract:

It has been possible to develop titania-clad silica waveguides that successfully propagate light even though there is a high refractive index of the titania cladding compared with the silica core. Mesoporous metal oxide-clad waveguides do not need to be limited to silica/titania structures.

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Characterization and effect of hydrogen treatment and UV radiation on photosensitive sol-gel derived aluminosilicate planar waveguides

Article Abstract:

An investigation of Ce3+-doped aluminosilicate planar waveguides is presented. It is shown that the sol-gel process is a suitable way of producing photosensitive aluminosilicate planar waveguides with good optical quality.

Aluminum silicates

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