【作者】 冯彩婷； 武攀峰； 李云垒； 李勤龙； 袁宵宵； 薛岗林；

【Author】 Caiting Feng;Panfeng Wu;Yunlei Li;Qinlong Li;Xiaoxiao Yuan;Ganglin Xue;College of Chemistry & MateiralsSecience, Northwest University;

【机构】 西北大学化学与材料科学学院；

【摘要】 磷钨酸是一种强的质子酸,五氧化二钽本身具有酸催化活性,两者复合可增强酸催化效果^[1]。本文将磷钨酸负载于介孔五氧化二钽包覆的Fe₃O₄纳米球表面,制备出一种易回收的磁性核壳结构催化剂Fe₃O₄@mTa₂O₅/H₃PW₁₂O₄₀。通过FT-IR、N₂吸附-脱附、TEM、SEM、NH₃-TPD分析、XRD对催化剂的结构进行表征。这种非均相的催化剂具有很强的Br?nsted及Lewis酸性,比表面积大,对各种醛和二醇的缩醛化反应显示出非常高效的催化活性。该催化剂很容易回收并且可以重复利用至少5次而不明显降低催化活性。同时,催化剂的组成和结构保持稳定不变。催化剂催化苯甲醛和乙二醇的缩醛化反应,苯甲醛乙二醇缩醛的产率可达93.6%。更多还原

【Abstract】 H₃PW₁₂O₄₀ is a kind of strong proton acid and Ta₂O₅ has acid catalytic activity.The acid catalytic activity can be enhanced through the combination of both.In this study,a magnetically-recoverable core-shell catalyst (Fe₃O₄@mTa₂O₅/H₃PW₁₂O₄₀) was prepared by loading phosphotungstic acid on tantalum pentoxide-coated Fe₃O₄ nanoparticles.The prepared samples were characterized by FT-IR,N₂-adsorption–desorption isotherms,TEM,SEM,NH₃-TPD analysis and XRD.Fe₃O₄@mTa₂O₅/H₃PW₁₂O₄₀ catalyst has strong Br?nsted and Lewis acidity,large BET surface area,and exhibits efficient catalytic reactivity for various aldehydes and glycols.The catalyst can be easily recovered and reused for at least 5 times without obvious decrease of catalytic activity.Moreover,it gives the highest yield of benzaldehyde glycol acetal of 93.6%for catalyzing the acetalization of benzaldehyde and ethylene glycol更多还原