46.室温において石炭チャーへ吸着した窒素の脱離挙動

抄録

Taiheiyo coal char and Blair Athol coal char were exposed to air at ambient temperature. The amount of adsorbed N_2 was quantitatively measured by a temperature programmed desorption technique. It took over 40 days to attain the adsorption equilibrium for TH char and the adsorption rate was quite slow. The amount of N_2 adsorbed on TH char after the exposure for 30 days corresponded to 23% of the total amount of nitrogen determined by ultimate analysis. Furthermore, the rates for N_2 adsorption and desorption for TH char were measured gravimetrically. N_2 adsorbed on TH char was removed by evacuating at 10Pa. One-third of the adsorbed N_2 was retained even after the evacuation for 20h. The retained N_2 after the evacuation was desorbed by heating at 373K.