八羟基喹啉铁(Ⅱ)/MCM-41对苯酚羟化的催化作用  

CATALYSIS OF IRON(Ⅱ) 8 QUINOLINOL/MCM 41 IN PHENOL HYDROXYLATION

作　　者：刘持标[1] 叶兴凯[1] 吴越[1] 

机构地区：[1]中国科学院长春应用化学研究所

出　　处：《催化学报》1997年第2期140-143,共4页

基　　金：国家自然科学基金

摘　　要：利用ＭＣＭ－４１中孔分子筛为载体，制备了负载型八羟基喹啉铁（Ⅱ）／ＭＣＭ－４１（简记为Ｆｅ（Ⅱ）－Ｑｘ／ＭＣＭ－４１）催化剂．ＸＲＤ，ＩＲ证明八羟基喹啉铁（Ⅱ）配合物成功地负载于ＭＣＭ－４１分子筛中．考察了八羟基喹啉铁（Ⅱ）／ＭＣＭ－４１对苯酚羟化反应的催化作用，和未负载的配合物相比，苯酚的转化率、对苯二酚的选择性以及Ｈ２Ｏ２的利用率都有显著的提高．同时也探讨了温度、反应介质及介质ｐＨ值对苯酚羟化反应的影响．结果表明，随着温度的提高，苯酚的转化率增加，但温度太高，易导致副产物增多；有机溶剂不利于羟化反应的进行，水是实验条件下苯酚羟化反应的最佳反应介质；在一定程度上，ｐＨ值越低，越有利于反应活性的提高，若ｐＨ值太低，活性反而下降，ｐＨ值升高不利于苯酚羟化反应的进行．该催化剂也具有较高的稳定性．MCM 41 mesoporous molecular sieve was synthesized and used as support to prepare the supported iron(Ⅱ) 8 quinolinol/MCM 41 catalyst. XRD and IR spectra showed that iron(Ⅱ) 8 quinolinol was supported on MCM 41 successfully. Catalysis of iron(Ⅱ) 8 quinolinol/MCM 41 was investigated compared with that of non supported iron(Ⅱ)8 quinolinol, and found that the former had higher phenol conversion, better hydroquinone selectivity and higher utilizing rate of H 2O 2. Meanwhile, the effect of temperature, reaction medium and pH of medium on phenol hydroxylation was also studied, the results showed that the higher temperature brought better catalytic activity, but too high temperature would lead to more side products; phenol hydroxylation can proceed easily in water, difficultly in organic medium; although low pH may increase phenol conversion, but more side products can also be produced; generally, high pH will inhibit phenol hydroxylation. This catalyst also has good stability.

关 键 词：苯酚 羟基化 分子筛 八羟基喹啉铁 催化剂 

分 类 号：O625.312[理学—有机化学] O643.36[理学—化学]