炭素の気相成長における鉄触媒の粒径効果

概要

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Two important carbon materials, fiber and graphite powder, can be produced by catalytic thermal decomposition of benzene on iron at temperatures around 1100℃. The shape of carbon deposit is considered dependent mainly on the particle size of the iron catalyst. In the present work, morphology and crystallinity of carbon grown on iron were investigated by changing the particle size and the amount of iron supported on active carbon. Carbon fibers of 10-15 μm diameter and 1-2 cm length were obtained when iron particles of 200-500 Å were loaded on the support at an amount less than 2 -3 wt%. The fiber growth markedly decreased with increase of the particle size and the amount of the catalyst. Instead, granular and plate-like carbon were formed, which were confirmed graphitic in nature by X-ray and electron diffractions. In case of the 68.1 wt% iron catalyst, crystallinity of the graphitic powder was close to that of a commercial product.
長崎大学工学部,Faculty of Engineering, Nagasaki Universityの論文