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Preparation of carbon nano-fiber Washcoat on Porous Silica Foam as Structured Catalyst Support

Chinese Journal of Chemical Engineering 2006年第3X期14卷 294-300页

作者：刘平乐 L.Lefferts 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

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 interconnection of the spheres so as to obtain porous materials with open structure. Following the treatment of hexdecyltrimethylammonium 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

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Stability and activity of carbon nanofiber-supported catalysts in the aqueous phase reforming of ethylene glycol

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Journal of Energy Chemistry 2013年第2期22卷 257-269页

作者： T. van Haasterecht C. C. I. Ludding K. P. de Jong J. H. Bitter Inorganic Chemistry and Catalysis Utrecht University

Nickel, cobalt, copper and platinum nanoparticles supported on carbon nano-fibers were evaluated with respect to their stability, catalytic activity and selectivity in the aqueous phase reforming of ethylene glycol （230 ℃, autogenous pressure, batch reactor）. The initial surface-specific activities for ethylene glycol reforming were in a similar range but decreased in the order of Pt （15.5 h-1 ）〉Co（13.0 h 1 ）〉Ni（5.2 h-1） while the Cu catalyst only showed low dehydrogenation activity. The hydrogen molar selectivity decreased in the order of Pt （53%）〉Co（21%）〉Ni （15%） as a result of the production of methane over the latter two catalysts. Over the Co catalyst acids were formed in the liquid phase while alcohols were formed over Ni and Pt. Due to the low pH of the reaction mixture, especially in the case of Co （as a result of the formed acids）, significant cobalt leaching occurs which resulted in a rapid deactivation of this catalyst. Investigations of the spent catalysts with various techniques showed that metal particle growth is responsible for the deactivation of the Pt and Ni catalysts. In addition, coking might also contribute to the deactivation of the Ni catalyst.

关键词： carbon nano-fiber catalyst deactivation aqueous phase reforming non-noble metal catalyst

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