Catalysis Database

Alkylation of phenol with methanol over magnesium-aluminium calcined hydrotalcites

S. , Velu and C S , Swamy (1994) Alkylation of phenol with methanol over magnesium-aluminium calcined hydrotalcites. Applied Catalysis A: General, 119 (2). pp. 241-252.

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Official URL: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TF5-43RCXSD-5&_user=518931&_coverDate=11%2F24%2F1994&_alid=587782130&_rdoc=22&_fmt=full&_orig=search&_cdi=5217&_sort=d&_docanchor=&view=c&_ct=74&_acct=C000025838&_version=1&_urlVersion=0&_userid=5

Abstract

Vapour phase alkylation of phenol with methanol was carried out in a fixed-bed flow reactor over thermally calcined magnesium aluminium hydrotalcites, with Mg/Al atomic ratios from 3 to 10. The main products were anisole, o-cresol, and 2,6-xylenol. The influence of phenol-to-methanol molar ratio, reaction temperature and contact time on the product yields were examined. The activity of these catalysts was compared with MgO, Al2O3 and physically mixed MgO-AL2O3. Of the catalysts studied, Mg-Al 4.0:1 calcined hydrotalcite (CHT) was the most active. These catalysts are more active than magnesia and γ-alumina. On the basis of the results obtained, a suitable reaction pathway was proposed. The participation of combined acidic and basic sites in the calcined hydrotalcites for the alkylation of phenol with methanol over magnesium-aluminium calcined hydrotalcites has been suggested. Prior to the reaction, the catalyst precursors were characterised by X-ray powder diffraction and surface area measurements.

Item Type:Article
Uncontrolled Keywords:Acid-base properties; Alkylation of phenol; Hydrotalcite; Mg/Al atomic ratio
Subjects:Science > Chemistry
ID Code:886
Deposited By:Prof Balasubramanian Viswanathan
Deposited On:12 Jun 2007 13:13
Last Modified:12 Jun 2007 13:13

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