<b>Preparation, characterisation and application of polyamine-silica hybrids in the epoxidation of α,β-unsaturated olefins</b>
Polyamine-silica hybrids were prepared by a one-pot sol-gel method <i>via</i> a neutral amine templating route. At low loadings (<i>ca.</i> 1 mmol organic group per g of silica) the resultant materials displayed properties typical of M41S-type materials, namely, high surface...
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| Format: | Article |
| Language: | English |
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Chemical Society of Ethiopia
2002-06-01
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| Series: | Bulletin of the Chemical Society of Ethiopia |
| Online Access: | http://www.ajol.info/index.php/bcse/article/view/20954 |
| Summary: | Polyamine-silica hybrids were prepared by a one-pot sol-gel method <i>via</i> a neutral amine templating route. At low loadings (<i>ca.</i> 1 mmol organic group per g of silica) the resultant materials displayed properties typical of M41S-type materials, namely, high surface area (typically 600 m<sup>2</sup> g<sup>-1</sup>) and controlled porosity with an average pore diameter of 3.6 nm. However, the materials were amorphous at loading above 1.2 mmol organic group per g of silica. The materials were used as heterogeneous base catalysts in the epoxidation of electron deficient olefins. The yields of the epoxide product ranged between 52% and 76%, depending on the loading of the catalytic group. |
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| ISSN: | 1011-3924 1726-801X |