酸改性的Hβ分子筛催化合成乙酰基吡咯  

Synthesis of Acetylpyrroles Catalyed by Acid Modified Hβ Zeolite

作　　者：白国义[1] 杨永会[1] 王磊[1] 

机构地区：[1]河北大学化学与环境科学学院河北省化学生物学重点实验室,河北保定071002

出　　处：《河北大学学报（自然科学版）》2011年第2期155-159,共5页Journal of Hebei University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(20806018);河北省教育厅自然科学研究重点计划资助项目(ZD200910);河北省自然科学基金资助项目(B2011201017)

摘　　要：研究了分别以不同的分子筛以及草酸、磷酸、盐酸等酸改性的Hβ分子筛为催化剂,由吡咯和乙酸酐合成乙酰基吡咯的Friedel-Crafts酰基化反应.发现磷酸改性的Hβ分子筛催化剂的活性最高,并对催化剂用量、反应温度、反应时间等反应条件进行了优化,确定了最佳反应条件:反应温度70℃、催化剂用量0.4 g、反应时间5 h,此时,吡咯的转化率为97.4%,2-乙酰基吡咯的选择性为76.7%,乙酰基吡咯的总选择性为93.8%.同时,稳定性实验证明磷酸改性的Hβ分子筛具有良好的稳定性.The Friedel-Crafts acylation of pyrrole and acetic anhydride was carried out over different unmodified zeolites and acid modified beta zeolites.The results showed that phosphoric acid modified zeolite had the highest catalytic activity.The influence of the amount of catalyst,the reaction temperature and the reaction time were investigated and optimized.The conversion of pyrrole was 97.4% and the selectivities to 2-acetylpyrrole and acetylpyrroles were 76.7% and 93.8%,respectively,while the temperature was 70 ℃,the catalyst amount was 0.4 g and the reaction time was 5 h.Moreover,the phosphoric acid modified zeolite exhibited good stability in this reaction.

关 键 词：酸改性 分子筛 乙酰基吡咯 Friedel-Crafts酰基化 

分 类 号：O643.322[理学—物理化学]