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H_6P_2W_(18)O_(62)/高岭土的制备、表征及催化合成乙酰水杨酸 被引量:7

Preparation and characterization of H_6P_2W_(18)O_(62)/Kaolin and its activity on the catalytic synthesis of acetylsalicylic acid
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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。 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.
出处 《化工进展》 EI CAS CSCD 北大核心 2014年第5期1205-1209,1241,共6页 Chemical Industry and Engineering Progress
基金 国家自然科学基金(21161009) 江西省自然科学基金(20132BAB203004 20122BAB213001) 江西省教育厅科技项目(GJJ13723) 九江学院科技(2013KJ005)项目
关键词 H6P2W18O62/高岭土 乙酰水杨酸 载体 催化 酯化 H6P2W18O62/Kaolin acetylsalicylic acid support catalysis esterification
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