负载型Ni-B非晶态合金的制备及其催化加氢活性研究

通过化学还原沉积法将超细Ni B非晶态合金负载于介孔分子筛 (MCM 4 1,HMS)上 ,以丙烯腈加氢生成丙腈为目标反应 ,考察了上述催化剂的催化活性和热稳定性 ,并与Ni B/SiO2 和非负载型Ni B非晶态合金做了比较 .研究发现 ,上述 4种催化剂的催化活性依次为 :Ni B/MCM 4 1>Ni B/HMS >Ni B/SiO2 >Ni B .结合比表面测试 (BET) ,电感耦合等离子光谱 (ICP) ,X射线衍射 (XRD) ,差示扫描量热法 (DSC) ,选区电子衍射 (SAED)以及氢吸附等表征手段 ,发现高比表面和具有规整结构是Ni B/MCM 4 1具有较高活性的原因 .

Preparation of Supported Amorphous Ni-B Alloys and Their Catalytic Activity in Acrylonitrile Hydrogenation

The ultrafine Ni B amorphous alloys supported on mesoporous molecular sieves (MCM 41,HMS) were prepared by chemical reduction and deposition (CRD) method. Taking the hydrogenation of acrylonitrile as the target reaction, the catalytic activity and thermo stability of these catalysts have been examined,and the results have been compared with that of Ni B/SiO 2 and ultrafine amorphous Ni B alloy. Experimental results show that the activity order of these catalysts are:Ni B/MCM 41>Ni B/HMS>Ni B/SiO 2>Ni B. Being characterized by BET, ICP,XRD,DSC,SAED and hydrogen adsorption method,it is found that the high activity of Ni B/MCM 41 catalysts could be attributed to the high surface area and the ordering mesoporous structure of MCM 41.