钨离子液体催化氧化环己醇制得环己酮的性能

Tungsten ionic liquids: Application of cyclohexanol oxidation

该反应体系是以钨离子液体[(CH3)N(n-C8H17)3]2W2O11为催化剂,H2O2(30%)为氧化剂,催化氧化环己醇制得环己酮。分别考察了催化剂用量、氧化剂用量以及温度变化对反应的影响。实验确定的反应最佳条件为反应温度65℃,环己醇用量5 mmol,催化剂用量50μmol,H2O2用量15 mmol。在最佳条件下反应8 h,环己酮的产率可达99%以上。反应过程无副产物,选择性好(>99%),体系异相催化,催化剂简单处理后可循环使用4次。

The ionic liquid [（CHs）N（n-CsH17）3]2W2O11 can be applied as a catalyst in cyclohexanol oxidation. Experiments show that it has good catalytic activity on cyclohexanol oxidation with H2O2 as the oxidant. It was conducted at 65 ℃ by adding substrate （5 mmol）, catalyst （50 μmol） and H202 （15 mmol） in a stirred mixture in a reactor. The yield is more than 99 %. The catalyst could be recycled after simple filtering.