Mo基/HZSM-5催化剂催化硝基苯加氢合成对氨基苯酚

制备了Mo基/HZSM-5双功能催化剂，用于催化硝基苯加氢合成对氨基苯酚(PAP)反应，考察了催化剂制备方法、Mo负载量、反应条件对其催化性能的影响。结果表明，与MoO2/HZSM-5相比，相同Mo负载量的MoS2/HZSM-5在催化合成PAP反应中表现出较高的催化活性，在w(3% MoS2/HZSM-5)=0.5%、T=155℃、p=3.5MPa、t=2 h条件下，硝基苯转化率为91.4%，PAP选择性为47.6%。MoS2/HZSM-5中掺杂第二金属Mn，可调变该催化剂的活性位，有助于提高催化合成PAP反应的PAP选择性；当Mn负载量为0.5%时，硝基苯转化率为76.5%，PAP选择性为55.8%。

Synthesis of p-Aminophenol via Hydrogenation of Nitrobenzene over Mo-base/HZSM-5 Catalyst

A series of Mo-base/HZSM-5 catalysts were prepared for the hydrogenation of nitrobenzene to p-aminophenol (PAP). The effects of preparation method, Mo loading amount and hydrogenation conditions on the conversion and PAP selectivity of the reaction were investigated. The results revealed that MoS2/HZSM-5 catalyst exhibited higher catalytic activity than MoO2/HZSM-5 with the same Mo loading amount in PAP synthesis. Under the optimized conditions of 3%MoS2/HZSM-5 amount 0.5%, reaction temperature 155℃, pressure 3.5 MPa and reaction time 2 h, the nitrobenzene conversion was 91.4% and the PAP selectivity was 47.6%. Doping of Mn in MoS2/HZSM-5 could change the active sites and improve PAP selectivity for the hydrogenation of nitrobenzene. Catalyzed by MoS2-Mn/HZSM-5 with Mn loading amount of 0.5%, the nitrobenzene conversion and PAP selectivity of PAP synthesis reached 76.5% and 55.8%, respectively.