Abstract
SO3H-functionalized imidazole ionic liquids [HSO3-bmim]CF3SO3, [HSO3-bmim]-HSO4, [HSO3-bmim]CH3SO3 and [HSO3-bmim]p-CH3(C6H4)SO3H were used as catalysts for the hydration of cyclohexene to cyclohexanol. It was found that the catalytic activity of the ionic liquids increased with increasing acid strength, and [HSO3-bmim]HSO4 simultaneously showed high activity and high cyclohexanol selectivity. Under the optimized conditions, cyclohexene conversion was 10.1 % with 98.7 % cyclohexanol selectivity. When [HSO3bmim]HSO4 was separated and reused for the fifth time, cyclohexene conversion was still 10.2 % with 99.0 % cyclohexanol selectivity. The good stability may be attributed to the little effect of the side-products with high-boiling points on the ionic liquid.
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