MIXED GEOMETRY CHARACTERIZATION OF ACTIVATED CARBONS PSD

摘要

The slit pore geometry is usually assumed for the characterization of activated carbons, especially in determining the Pore Size Distribution (PSD). However, observed high values of the heat of adsorption in activated carbons at very low pressure cannot be explained by slit micropores, even for ultra-small sizes. On the other hand, it is reasonable to assume that, at least in part of the material, carbon plates may accommodate in such a way as to form pores with other geometries. Steele et al. and Seaton et al. [1,2] have investigated, for example, the use of rectangular micropores. In this work, we propose micropores with a triangular section. This kind of geometry would provide adsorption regions of higher heats of adsorption, since adsorption in the center of a triangular pore is affected by 3 graphitic plates instead of 2.