Investigations of a complete pore structure analysis

A method is offered for determining the pore volume and pore surface distributions of micropores, i.e., pores having widths of the order of 16 A or less. The method is an extension of the “t-method” of de Boer and his co-workers, and the authors have named it micropore analysis method or “MP-method.” The volumes, surfaces, and hydraulic radii of groups of pores are calculated from the downward deviations of the straight line in the de Boer vl − t plot. Certain problems connected with the method are discussed. The application of the method is illustrated with the analysis of the pores of a silica gel that contains only micropores. Evidence is offered that the BET surface gives a correct value for the entire surface of the silica gel accessible to nitrogen.