清浄化した人造黒鉛上での表面酸化物の再生と水蒸気吸着

概要

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Graphite has two types of surface, i.e., basal plane and prism plane. On the latter surface various kinds of surface oxides exist. Through heat treatments at high temperatures surface oxides are demolished into various gases that contain oxygen: the surface without oxygen, which is termed "cleaned" here, is thus obtained. Water molecules chemisorb onto carbon atoms at the periphery of such cleaned hexagon sheets of graphite, to reproduce surface oxides. The reproduced surface oxides also fill the role of physisorption site for water. The present authors have long been studying the adsorption of water on natural graphite. They used here artificial graphite as a sample for the first time, and examined the chemisorption and physisorption of water on the graphite. The results are compared with those obtained in the previous investigations. The present authors have found that the prevailing existence of CO-desorbing oxides on the artifician graphite keeps the isosteric heat of adsorption of water above the heat of liquefaction of water as in the case of the natural graphite.
津山工業高等専門学校の論文
2004-02-27