Vapour phase selective O-alkylation of phenol over alkali loaded silica

Bal, Rajaram ; Sivasanker, S. (2003) Vapour phase selective O-alkylation of phenol over alkali loaded silica Applied Catalysis A: General, 246 (2). pp. 373-382. ISSN 0926-860X

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/S0926-860X(03)00082-6

Abstract

Vapour phase selective O-alkylation of phenol with methanol, ethanol, n-propanol and n-butanol has been investigated in the temperature range 573-673 K over alkali loaded (Li, Na, K and Cs) fumed silica. Fumed silica has negligible alkylation activity, but on impregnation with alkali metal oxides (Li, Na, K and Cs) becomes active for O-alkylation producing arylalkyl ethers. Activities of the catalysts increase with metal loading and with basicity of the metal ions (Cs > K > Na > Li). Very high conversion (~90%) and 100% O-methylation selectivity was obtained over Cs loaded silica with methanol as the alkylating agent. Conversion decreases with increase in carbon chain of the alkylating agent. Catalyst deactivation rate and the reaction rates at various reaction parameters like contact time, temperature, mole ratio, were also investigated.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:O-alkylation; Alkali Metal Loaded Silica; Alkylating Agent; Basicity; Deactivation Rate
ID Code:47708
Deposited On:12 Jul 2011 05:49
Last Modified:12 Jul 2011 05:49

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