康婧娟,汤吉海,费兆阳,张竹修,陈献,崔咪芬,乔旭

• 1:南京工业大学化工学院
• 2:国家"江苏先进生物与化学制造协同创新中心"
• 3:南京工业大学材料化学工程国家重点实验室

摘要(Abstract)：

以γ-Al_2O_3为载体,KNO_3为前驱体,制备了不同负载量的固体碱催化剂K_2O/Al_2O_3,并用于丙烯酸乙酯(EA)和乙醇加成制备3-乙氧基丙酸乙酯(EEP)反应研究。XRD、FT-IR、N_2吸附-脱附和CO_2-TPD表征结果表明,K_2O/Al_2O_3具有强弱两种碱性位,分别是KNO_3高温焙烧下分解生成的强碱性位K_2O和KNO_3与载体相互作用形成的弱碱性位K-O-Al;提高KNO_3负载量可增加催化剂碱量,但破坏载体结构,降低催化剂比表面积和孔容。加成反应结果表明,30%(wt)K_2O/Al_2O_3具有最高的催化活性,当反应温度为70℃,乙醇和EA摩尔比为6:1,催化剂用量为EA的10%(wt)时,EA的转化率为53.6%,EEP的选择性为98.8%。重复性实验表明,强碱性位中的K_2O与乙醇发生反应生成乙醇钾,进一步溶解于反应液,导致活性位流失,催化剂重复使用活性显著降低。将流失的钾再次浸渍负载到失活催化剂上,可以恢复失活的催化剂活性。因此,开发直接稳定乙醇钾的固体碱催化剂是重要的研究方向。

关键词(KeyWords)： 固体碱;K2O/Al2O3;丙烯酸乙酯;催化剂失活

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(21676141,21606130);; 江苏省“六大人才高峰”项目(2015-XCL-017)

作者(Author): 康婧娟,汤吉海,费兆阳,张竹修,陈献,崔咪芬,乔旭

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