| 摘要 |
There are provided alkylation catalysts comprising magnesium oxide mixed with and bonded by manganese oxides. These are used in processes for the vapor phase ortho-alkylation of phenols with an alcohol. The present catalysts are advantageous in that they provide a substantially increased total useful life, a reduced induction period for maximum reaction selectivity, elimination of catalyst losses in comparison with the powders or weakly sintered composites of the prior art and increased selectivity for ortho-substitution. Treatment of the new catalysts with methanol vapor before use enhances their activity in converting phenols to 2,6-xylenol and results in a significant increase in production rate.
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