Abstract: H6P2W18O62/kaolin was fabricated by dipping Kaolin in the mixing solution of phosphotungstic acid with Dawson structure，and characterized by FT-IR，XRD，SEM and EDS. The catalytic synthesis of acetylsalicylic was carried out as a probe reaction to study the acid catalytic performance of the catalyst，under the optimal condition，i.e. the supported quantity of 40%，w (catalyst）= 7.2% (relative to the dosage of salicylic acid)，reaction temperature of 90℃，and reaction time of 40min. The average yield of acetylsalicylic acid reaches 90.2%. The catalyst shows good reusability. After its five time usage，the yield of acetylsalicylic acid was still above 85.1%. The catalyst is attractive for esterification by its low cost，high activity，simple post-treatment，no corrosion to the equipment and no pollution.

Key words: H6P2W18O62/Kaolin, acetylsalicylic acid, support, catalysis, esterification

摘要： 以高岭土为载体，Dawson结构磷钨酸（H6P2W18O62?13H2O）为活性组分制备了负载型催化剂H6P2W18O62/高岭土，并通过FT-IR、XRD、SEM和EDS对催化剂进行表征。以催化合成乙酰水杨酸为探针反应，考察了催化剂的酸催化性能。结果表明，在优化反应条件为H6P2W18O62负载量为40%，w(H6P2W18O62/高岭土)=7.2%（基于水杨酸的质量），反应温度为90℃，反应时间为40min时，乙酰水杨酸收率达90.2%，催化剂重复使用5次，乙酰水杨酸收率仍可达到85.1%。该催化剂具有价廉易得、催化活性高、后处理工艺简单、不腐蚀设备、无环境污染、可重复使用等优点。

关键词: H6P2W18O62/高岭土, 乙酰水杨酸, 载体, 催化, 酯化