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A generalizedapproach to determine the complete distribution ofmacropores, mesopores, and micropores from argon adsorption and mercuryporosimetry is developed and validated for advanced zeolite catalystswith hierarchically structured pore systems in powder and shaped forms.Rather than using a fragmented approach of simple overlays from individualtechniques, a unified approach that utilizes a kernel constructedfrom model isotherms and model intrusion curves is used to calculatethe complete pore size distribution and the total pore volume of thematerial. An added benefit of a single full-range pore size distributionis that the cumulative pore area and the area distribution are alsoobtained without the need for additional modeling. The resulting completepore size distribution and the kernel accurately model both the adsorptionisotherm and the mercury porosimetry. By bridging the data analysisof two primary characterization tools, this methodology fills an existinggap in the library of familiar methods for porosity assessment inthe design of materials with multilevel porosity for novel technologicalapplications. [ABSTRACT FROM AUTHOR]