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采用化学还原法,以Ni(Ac)2.4H2O和NH4Mo9O24.4H2O为原料,KBH4为还原剂,制备了Ni-Mo-B非晶态合金催化剂。以硝基苯加氢为探针反应,考察了制备条件对Ni-Mo-B催化剂的结构和性能以及反应温度、压力与催化剂用量等反应条件对催化加氢性能的影响。研究结果表明,适当添加Mo可以提高Ni-B催化剂活性。当Mo掺杂量为Ni质量的5%时,Ni-Mo-B催化剂活性最佳。Mo主要以MoO3的形式存在,MoO3的分散作用可防止Ni-B合金粒子的团聚,提高了催化剂比表面积,稳定了Ni-Mo-B催化剂的非晶态结构。
Ni-Mo-B amorphous alloy catalysts were prepared by chemical reduction method using Ni (Ac) 2.4H2O and NH4Mo9O24.4H2O as raw materials and KBH4 as reductant. Hydrogenation of nitrobenzene as a probe reaction, the preparation conditions of Ni-Mo-B catalyst structure and properties as well as the reaction temperature, pressure and the amount of catalyst and other reaction conditions on catalytic hydrogenation performance. The results show that adding appropriate Mo can improve the activity of Ni-B catalyst. Ni-Mo-B catalyst has the best activity when Mo doping is 5% of Ni. Mo mainly exists in the form of MoO3. The dispersion of MoO3 can prevent agglomeration of Ni-B alloy particles, increase the specific surface area of the catalyst and stabilize the amorphous structure of the Ni-Mo-B catalyst.