Preparation of Carbon Nano-fiber Washcoat on Porous Silica Foam as Structured Catalyst Support  

作　　者：刘平乐 L. Lefferts 

机构地区：College of Chemical Engineering Xiangtan University Xiangtan 411105 China Faculty of Science and Technology IMPACT University of Twente P. O. Box 217 7500 AE Enschede TheNetherlands

出　　处：《Chinese Journal of Chemical Engineering》2006年第3X期294-300,共7页中国化学工程学报（英文版）

基　　金：NUFFIC, CSC and the Scientific Research Fund of Hunan Provincial Education Department (No.04B060).

摘　　要：This paper reports how a hairy layer of carbon nano-fibers can be prepared on the macro-porous silica foam produced by the sphere templating method. Firstly, three-dimensional close-packed crystals of polystyrene spheres are assembled on porous disk substrate by vacuum filtration or evaporation. The polystyrene template is annealed slightly above the glass transition temperature in order to strengthen the colloidal crystal and ensure inter- connection of the spheres so as to obtain porous materials with open structure. Following the treatment of hexde- cyltrimethylammonium bromide, the polystyrene template is filled with silica colloidal solution, which solidifies in the cavities. Then the polystyrene particles are removed by calcination at 843K, leaving behind porous silica foam. Scanning electron microscopy images demonstrate that silica foam has uniform and open structured pores. Nickel particles were deposited on porous silica foam layer by the dipping method and porous carbon nano-fiber washcoat was prepared by catalytic decomposition of ethene over small nickel particles.

关 键 词：SPHERE TEMPLATE COLLOIDAL crystal SILICA foam carbon nano-fiber WASHCOAT 

分 类 号：O643.36[理学—物理化学]