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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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活性炭催化苯一步羟基化制备苯酚
DOI: 10.1016/S1872-2067(11)60444-0, PP. 1622-1630
Keywords: 活性炭,苯,羟基化,含氧基团,模型化合物,苯酚
Abstract:
？将市售活性炭经过硝酸、过氧化氢及不同温度进行处理后用于苯的羟基化反应,并研究了活性炭催化苯羟基化反应机理.用Boehm滴定,N2吸附-脱附及X射线光电子能谱对活性炭进行了表征.结果表明,反应体系的pH对催化剂活性具有重要的影响,活性炭对苯的吸附受表面含氧基团含量的影响.模型化合物反应结果表明,活性炭表面的酚羟基和羰基是反应的活性位,两者可相互转化,并在一定的pH条件下达到平衡,该转化使得H2O2活化为羟基自由基,进而与苯反应生成苯酚.在苯羟基化反应中,活性炭表现出良好且稳定的催化性能,苯酚收率可达14.4%.
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