载体对Ni-B催化剂邻氯硝基苯液相加氢性能的影响

以纳米碳管（CNTs）、活性三氧化二铝（γ-Al₂O₃）、活性炭（AC）和二氧化硅（SiO₂）为载体，Ni为活性组分,采用浸渍-化学还原法制备了负载型Ni-B非晶态合金催化剂，并利用SEM和TEM等表征手段对各催化剂的形貌进行了表征。以邻氯硝基苯的氢化为探针反应评价了各催化剂的催化性能。结果表明，在相同的反应条件下，以γ-Al₂O₃和SiO₂为载体的催化剂使底物转化率均较低，分别为40%和74.5%，但选择性相对较高，分别为96.8%和94.3%；而负载于CNTs和AC上的Ni-B使底物具有较高的转化率，均高于85%，选择性分别为95.5%和90.4%。根据对催化剂的物理表征，从载体的结构上对各催化剂催化性能产生的差异做出了理论解释。

Effects of supports on catalytic properties of Ni-B amorphous alloy catalyst for liquid-phase hydrogenation of o-chloronitrobenzene

Ni-B amorphous alloy catalysts supported on carbon nanutubes (CNTs), γ-Al₂O₃, activated carbon (AC) and SiO₂, as the catalyst for liquid-phase hydrogenation of WTBX]oWTBZ]-chloronitrobenzene, were prepared by impregnation-chemical-reduction method and characterized by TEM and SEM. The results showed that，under the same reaction condition，conversion of the substrate over Ni-B catalyst supportedon γ-Al₂O₃and SiO₂ was relatively lower (40% and 74.5%, respectively) while selectivity to the target product was high(96.8% and 94.3%, respectively); conversion of the substrate and selectivity to the target product over Ni-B catalystsupported on CNTs and AC were high (conversion of over 85%, and selectivity of 95.5% and 90.4%, respectively). The causes behind the difference was discussed from the aspect of structure of the supports.