Bal, Rajaram ; Tope, B. B. ; Sivasanker, S. (2002) Vapour phase O-methylation of dihydroxy benzenes with methanol over cesium-loaded silica, a solid base Journal of Molecular Catalysis A: Chemical, 181 (1-2). pp. 161-171. ISSN 1381-1169
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/S1381-1169(01)00361-2
Abstract
Vapour phase O-methylation of the dihydroxy benzenes, catechol, resorcinol and hydroquinone with methanol has been investigated in the temperature range 573-673 K over alkali-loaded fumed silica. Fumed silica (SiO2) by itself has no O-methylation activity, but on impregnation with alkali metal oxides (Li, Na, K and Cs) becomes active for O-methylation producing mono- and dialkylated products. Activity of the catalysts and selectivity for dialkylates increase with metal loading and basicity of the metal ions (Cs > K > Na > Li). Very high conversion (~93%), at nearly 100% selectivity for O-methylation was obtained over Cs-loaded fumed silica in the case of resorcinol and hydroquinone.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | O-methylation; Dihydroxy Benzenes; Methanol; Alkali-loaded Silica; Basic Catalysts |
| ID Code: | 47726 |
| Deposited On: | 12 Jul 2011 14:40 |
| Last Modified: | 12 Jul 2011 14:40 |
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