Pd/CMK-3催化加氢制备邻氨基苯酚研究

Preparation of 2-aminophenol by catalytic hydrogenation over Pd/CMK-3 catalysts

采用浸渍还原法在CMK-3介孔炭上负载Pd制备Pd/CMK-3催化剂,考察了Pd/CMK-3水相催化加氢邻硝基苯酚钠制备邻氨基苯酚钠的催化性能。结果表明:当Pd负载量为5%,反应温度为338 K,反应压力为1 MPa时,邻硝基苯酚钠的转化率达到100%,邻氨基苯酚钠的选择性高于99.5%,邻氨基苯酚收率为98.0%。采用XRD、BET、SEM和TEM对于催化剂进行了表征,结果表明:CMK-3具有良好的介孔结构以及较高的比表面积,Pd纳米颗粒在CMK-3表面高度分散且具有较好稳定性,因此具有更高的催化加氢活性。

The catalysts of Pd/CMK-3 are prepared by impregnation and reduction of Pd using mesoporous carbons CMK-3 as the support.The catalytic properties of Pd/CMK-3 are investigated for hydrogenation of sodium 2-nitrophenoxide to sodium 2-aminophenoxide in aqueous solution.The results show that the conversion of sodium 2-nitrophenoxide,the selectivity of sodium 2-aminophenoxide and the yield of 2-aminophenol are 100％,about 99.5 ％ and 98.0％,respectively,with 5％ Pd in CMK-3 under 338 K of temperature and 1.0 MPa of pressure.The catalysts are characterized by XRD,BET,SEM and TEM.The results suggest that Pd nanoparticles are highly dispersed and stabilized on the surface of CMK-3 due to the mesoporouse structures of CMK-3 and larger specific surface area,which endows Pd/ CMK-3 with significantly higher activity for hydrogenation of sodium 2-itrophenoxide.