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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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酸碱双功能MgO/HMCM-22催化剂上Knoevenagel缩合反应
DOI: 10.1016/S1872-2067(11)60493-2, PP. 559-566
Keywords: MCM-22分子筛,氧化镁,浸渍,酸碱双功能,Knoevenagel缩合反应
Abstract:
？采用浸渍法制备了一系列MgO改性催化剂MgO/HMCM-22,利用X射线衍射、N2物理吸附-脱附、扫描电镜、傅里叶变换红外光谱、NH3及CO2程序升温脱附等技术对所制催化剂进行了表征.结果表明,MgO改性后MCM-22分子筛仍保持原有的结构;随着MgO负载量的增加,催化剂的碱强度和碱含量显著增加,而强酸含量明显减少,弱酸酸位有所增加.以Knoevenagel缩合为探针反应,考察了所制催化剂的性能.在优化的反应条件下,MgO/HMCM-22上苯甲醛转化率高达92.6%.催化剂MgO/HMCM-22和MgO/NaMCM-22的催化性能明显优于HMCM-22和MgO.酸中心和碱中心均对该缩合反应起着重要的促进作用.MgO/HMCM-22对Knoevenagel缩合反应显示出较高的催化活性,体现出明显的酸碱协同催化作用.
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