摘要
采用干法和湿法高能球磨将Ni-Al原始合金制备成超细粉末并活化成Raney-Ni催化剂.采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)等手段表征了球磨后Ni-Al合金及Raney-Ni催化剂的晶体结构和表面形貌,以环己酮加氢反应为探针考察了催化剂的催化加氢反应性能.结果表明,随着球磨时间的增加,Ni-Al合金粉末中NiAl3相含量逐渐减少,而Ni2Al3相含量逐渐增加,且其晶粒尺寸逐渐减小.活化后的Raney-Ni催化剂中只含有金属Ni相.添加甲醇的湿法球磨能明显增加Ni-Al合金颗粒的分散性,活化后的催化剂颗粒变小,分散性增加,从而提高了其环己酮加氢活性.
Ultrafines Ni-Al alloys are prepared by dry or wet high energy milling,and then the alloys are activated to Raney-Ni catalysts.The crystal structures and surface morphologies of Ni-Al alloys after milling and Raney-Ni catalysts are characterized by X-ray diffraction（XRD）and scanning electron microscopy（SEM）.The catalytic hydrogenation performance of Raney-Ni is evaluated by cyclohexanone hydrogenation.The results suggest that NiAl3 phase gradually decreases and Ni2Al3 phase gradually increases accompanied by deducing of crystal size with the milling time.Only Ni phase exists in the Raney-Ni catalyst.Dispersibility of Ni-Al alloys is obviously enhanced after high energy milling in methanol,which results in Raney-Ni catalysts with a better dispersibility and a smaller grain size.Therefore,the cyclohexanone hydrogenation performance of Raney-Ni catalysts was increased.
出处
《沈阳大学学报（自然科学版）》
CAS
2015年第6期431-434,共4页
Journal of Shenyang University：Natural Science
基金
国家自然科学基金资助项目(51302175)
辽宁省优秀人才支持计划资助项目(LJQ2014132)
2015年国家人社部留学人员科技活动项目择优资助项目
作者简介
王美涵（1977-），女，辽宁沈阳人，沈阳大学副教授，日本东京工艺大学博士后研究人员．
