Abstract: Dawson-type phosphotungstic acid (H6P2W18O62) supported on activated carbon (H6P2W18O62/C) solid acid catalyst was prepared by impregnation method and characterized by FT-IR and SEM. The catalytic performance was studied in the catalytic synthesis of cyclohexene from cyclohexanol. It was found that H6P2W18O62/C had good catalytic properties for the dehydration of cyclohexanol to cyclohexene. Under the optimal condition，i.e. w (catalyst) = 6.2%（relative to the dosage of cyclohexanol），reaction temperature of 180℃ and reaction time of 40 min，the yield of cyclohexene reached 89.1%. The activity of H6P2W18O62/C catalyst remained basically unchanged after five runs and the yield of cyclohexene was still above 80.3%.

Key words: Dawson-type phosphotungstic acid, activated carbon, catalysis, synthesis

摘要： 以活性炭为载体，用浸渍法制备出负载型Dawson结构磷钨酸（H6P2W18O62/C）催化剂，通过FT-IR和SEM对催化剂进行表征，以环己醇脱水合成环己烯为探针反应，考察催化剂的酸催化性能。实验结果表明，H6P2W18O62/C表现出良好的催化活性。在优化反应条件下：w（H6P2W18O62/C）=6.2%（基于环己醇质量），反应温度为180 ℃，反应时间为40 min，环己烯收率可达89.1%，催化剂重复使用5次后，收率仍可达80.3%。

关键词: Dawson结构磷钨酸, 活性碳, 催化, 合成