Studies on the quantitative analysis of closed pores using Small-Angle X-ray Scattering within porous carbon materials

Abstract

This study aimed to clarify the behavior of closed pores in coal chars during gasification process. Closed pore volume was calculated in terms of helium density and ash fraction. Closed pore surface area was calculated based on Small-Angle X-ray Scattering (SAXS). Close pore volume and closed pore surface area are rapidly decreased at an initial stage of char gasification. On the other hand, open pore immediately increased. These results would be indicated that closed pore was opened at an initial reaction. When gasification temperature was changed, the variation of closed pore surface area indicates different behavior. Then, we examined how closed pore contributed to the development of pore structure in each stage of gasification.