Abstract
Zeolites and zeolitic materials are widely employed in (petro) chemical industries. This chapter discusses the important aspects of applying gas adsorption for the textural and structural characterization of hierarchical zeolites. It focuses on the experimental requirements and necessary procedures to obtain accurate adsorption data with high resolution. The chapter provides a detailed understanding of the underlying adsorption mechanisms to correctly analyze the gas adsorption isotherms for surface and pore size analysis. It focuses on the recent developments concerning the state-of-the-art pore size and surface area analysis of hierarchical materials. The standard method applied in physical adsorption characterization for surface area assessment is the Brunauer, Emmett, and Teller (BET) method. The hierarchy factor (HF) is a simple tool to rank the catalytic performance of different mesoporous zeolites, regardless of their composition. Density functional theory (DFT) provides a more reliable approach to the pore size analysis over the complete nanopore range.
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