ALKYLATION OF PHENOL WITH METHANOL OVER MAGNESIUM-ALUMINUM CALCINED HYDROTALCITES

被引:151
作者
VELU, S [1 ]
SWAMY, CS [1 ]
机构
[1] INDIAN INST TECHNOL,DEPT CHEM,MADRAS 600036,TAMIL NADU,INDIA
关键词
ACID-BASE PROPERTIES; ALKYLATION OF PHENOL; HYDROTALCITE; MG/AL ATOMIC RATIO;
D O I
10.1016/0926-860X(94)85194-8
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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 gamma-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.
引用
收藏
页码:241 / 252
页数:12
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