用于甲烷干法重整的Ni/SiO_2纳米复合空心结构催化剂  

Hierarchical Hollow Ni/SiO_2 Nanocomposite for Methane Dry Reforming Catalysis

作　　者：李元[1] 张晴[1] 刘静[1] 张鹏[1] 宋雪峰[1] 高濂[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200240

出　　处：《硅酸盐学报》2015年第7期911-918,共8页Journal of The Chinese Ceramic Society

基　　金：211三期先进材料科学项目(WS3116205007);自然科学基金面上项目(51172142)

摘　　要：采用水热法制备了具有片层结构的Ni/SiO2纳米复合空心结构催化剂,研究了其对甲烷干法重整(DRM)反应的催化活性和稳定性,并以传统浸渍法制备的Ni/SiO2催化剂作为参照样。结果表明,Ni/SiO2纳米复合空心结构催化剂有很高的比表面积(405.6 m2/g)和显著提高的高温抗烧结与抗积碳能力。这归因于该复合空心结构以片层状镍硅酸盐为前驱体,金属镍纳米颗粒由前驱体在氢气气氛中高温还原分解得到,使得该结构具有很强的金属纳米颗粒与载体之间的相互作用,因而具有优异的催化性能。A hierarchical hollow Ni/SiO2 nanocomposite was prepared by a facile hydrothermal method, and the catalytic activity and stability of the hierarchical hollow Ni/SiO2 nanocomposite for dry reforming catalysis of methane （DRM） were analyzed. The Ni/SiO2 catalysts were also prepared by a conventional impregnation method as a reference sample. The results show that compared to the catalyst prepared by impregnation, the hierarchical hollow Ni/SiO2 nanocomposite has a specific surface area of 405.6 m2/g and an improved resistance to sintering and coke deposition at high temperatures DRM. The superior catalytic performance of the hierarchical hollow Ni/SiO2 nanocomposite is attributed to a metal-support interaction between the nickel nanoparticles and the silica support, which is resulted from the evolution of nickel nanoparticles via the decomposition reduction of hierarchical phyllosilicate precursor in hydrogen at high temperatures.

关 键 词：甲烷干法重整 二氧化硅负载镍催化剂 纳米复合空心结构 

分 类 号：O643[理学—物理化学]