【摘要】 在超声波条件下,利用金属诱导化学镀法制备了系列非晶态Ni-B合金和负载型Ni-B/MgO催化剂,并采用电感耦合等离子体发射光谱、X射线衍射、透射电镜、选区电子衍射和扫描电镜等手段进行了表征,考察了超声波对MgO上Ni-B形貌、组成和分散度的影响;以环丁烯砜加氢制环丁砜为探针反应,考察了Ni-B/MgO的催化性能.结果表明,Ni-B的非晶态结构不受超声波影响.制备过程中,超声波的引入能够提高活性组分的分散性,改善活性组分的粒径,催化剂的催化加氢性能得到明显改善.超声波辅助金属诱导化学镀Ni-B/MgO催化剂的最佳输出功率为80 W,制备温度为50℃.更多还原

【Abstract】 A series of amorphous Ni-B alloy and supported Ni-B/MgO catalyst samples were prepared by silver-catalyzed electroless plating under different ultrasonic conditions.The effects of ultrasonic wave on the structure,composition,surface texture,and dispersion of Ni-B particles on MgO were characterized by inductively coupled plasma,X-ray diffraction,transmission electron microscope,selected area electron diffraction,and scanning electron microscopy.The activity of the as-prepared catalyst was tested by hydrogenation of sulfolene to sulfolane.In comparison with the catalyst prepared without ultrasonication,the presence of proper ultrasonic wave during the preparation led to the improvement of silver-catalyzed electroless plating,homogeneous dispersion of Ni-B particles,narrow range of Ni-B particle size,and superior catalytic hydrogenation performance.The amorphous structure of Ni-B particles was not influenced by the ultrasonic wave.The optimal output power of ultrasonic wave was 80 W and the temperature was 50 ℃.更多还原