High Catalytic Activity in the Phenol Hydroxylation of Magnetically Separable CuFe2O4–Reduced Graphene Oxide
High Catalytic Activity in the Phenol Hydroxylation of Magnetically Separable CuFe2O4–Reduced Graphene Oxide
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DOI：
10.1021/ie501624u
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发表时间：
2014-07
影响因子：
4.2
通讯作者：
Zhao Yi-tao;Guangyu He;W. Dai;Haiqun Chen
中科院分区：
文献类型：
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作者：
Zhao Yi-tao;Guangyu He;W. Dai;Haiqun Chen
采用溶剂热法制备了一种还原氧化石墨烯修饰的高活性CuFe 2 O 4催化剂（CuFe 2 O 4-RGO）。采用FTIR、XRD、拉曼、TEM和XPS等手段对复合催化剂进行了表征，结果表明，CuFe 2 O 4纳米粒子（NPs）以致密、致密的方式沉积在还原氧化石墨烯（RGO）表面，粒径约为17.8 nm。首次将制备的CuFe 2 O 4-RGO复合材料用于催化苯酚羟基化反应，显示出良好的催化活性。苯酚转化为苯二酚的转化率达35.5%，选择性达95.2%，远高于文献报道的25.0%。催化剂在6次循环后仍保持较高的活性。更重要的是，由于其磁性分离性和苯酚羟基化过程的无有机溶剂性质，催化剂可以容易地回收。对CuFe_2O_4-RGO_（20）催化苯酚羟基化反应的机理进行了初步探讨。
We reported a highly active CuFe2O4 catalyst modified with reduced graphene oxide (CuFe2O4–RGO) by a solvothermal method. The composite catalyst was fully characterized by FTIR, XRD, Raman, TEM, and XPS, which demonstrated that the CuFe2O4 nanoparticles (NPs) with a diameter of approximately 17.8 nm were densely and compactly deposited on the reduced graphene oxide (RGO) sheets. The as-prepared CuFe2O4–RGO composites were used to catalyze phenol hydroxylation for the first time, which exhibited great catalytic activity. The conversion rate of phenol to dihydroxybenzenes reached 35.5% with a selectivity of 95.2% obtained, which is much higher than for reported systems (25.0%). The catalytic activity remained high after six cycles. More importantly, the catalyst can be easily recovered due to its magnetic separability and the organic solvent-free nature of the phenol hydroxylation process. A possible mechanism in phenol hydroxylation by H2O2 over CuFe2O4–RGO20 catalyst was also proposed.