超声波技术制备的NiB/Fe_3O_4非晶态合金催化剂的性能

采用粉末化学镀法在外加超声波的情况下制备了NiB/Fe3O4非晶态合金催化剂。以环丁烯砜加氢为探针反应,考察了超声波功率对NiB/Fe3O4非晶态合金催化剂活性的影响,确定了最佳超声波功率为80W,此条件下制备的NiB/Fe3O4非晶态合金催化剂可使环丁烯砜的转化率达99.9%,比无超声波条件下制备的NiB/Fe3O4非晶态合金催化剂提高了27.2%。采用液氮吸附、X射线衍射、透射电子显微镜、能量色散X射线分析、电感耦合等离子体发射光谱等方法对NiB/Fe3O4非晶态合金催化剂进行了表征。结果表明,在粉末化学镀法制备NiB/Fe3O4非晶态合金催化剂的过程中引入超声波,NiB团簇的非晶态结构没有改变,可使NiB/Fe3O4非晶态合金催化剂的比表面积增大60%,活性组分Ni的质量分数增加8.04%,这是催化活性提高的主要原因。

Preparation of NiB/Fe3O4 Amorphous Alloy Catalyst Under Ultrasonic and Its Catalytic Activity

Amorphous NiB/Fe3O4 catalyst was prepared by powder electroless plating under ultrasonic and was used in hydrogenation of sulfolene to sulfolane as probe reaction.Effect of ultrasonic power on activity of the catalyst was investigated. Under optimal ultrasonic power 80 W for catalyst preparation,conversion of sulfolene mounts to 99.9%,27.2% higher than that on the catalyst prepared without aid of ultrasonic.Fe3O4 support and the prepared catalysts were characterized by means of N2 adsorption,XRD,TEM,energy-dispersion X-ray analysis(EDX) and ICP.The results showed that amorphous state of the catalyst keeps unchanged during preparation under ultrasonic.However,specific surface area of catalyst increases by 60% and active nickel in the catalyst increases by 8.04%.So the catalytic activity improves.