Infiltration of Microporous Activated Charcoal by Pyrolysis of CH_4 and Its Effect on Enhancement of Resistance against Oxidation

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Pores within activated charcoal (A.C.) were infiltrated by pyrolitic carbon derived from thermal decomposition of CH<sub>4</sub>. The infiltrated activated charcoal showed an increase in resistance against oxidation with CO<sub>2</sub>. To elucidate the mechanism of this effect, the pore size distribution of macropores, mesopores and micropores including submicropores were characterized for the original A.C., infiltrated A.C., oxidized A.C. and A.C. oxidized after infiltration, respectively. It was found that the infiltration decreased the volume and the surface area of pores, particularly the surface area of micropores.<br> When oxidized, the carbon which deposited in macropores is almost burned but that in meso- and micropores is only partly burned; The ratio of increase in surface area of the infiltrated sample is smallest for the micropores. From these experimental results, it is deducible that the deposited carbon in micropores plays the major role for blocking CO<sub>2</sub> intruding, thereby the resistance against oxidation is enhanced.

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  • ISIJ international  

    ISIJ international 37(8), 738-747, 1997-08-15 

    The Iron and Steel Institute of Japan

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