Stacked nano FAU zeolite as hierarchical Murray material for enhancing CO₂ diffusion kinetics

Zeolite materials are widely used in the field of carbon capture and storage (CCS) due to their high specific surface area, good stability, and low cost. However, the microporous structure of zeolite is not conducive to the mass transfer and diffusion processes, which limits the efficiency and practical application of CO₂ capture. In this study, we designed a hierarchical Murray material consisting of ultra-small particle size (<20 nm) zeolite stacks based on Murray's law to enhance the diffusion kinetics of CO₂. The results demonstrate that the material exhibits a CO₂ adsorption capacity of 107.07 cm³·g⁻¹ and a CO₂/N₂ selectivity of 120.58, meeting the requirements for high-performance CO₂ capture materials. Kinetic CO₂ adsorption and breakthrough experiments confirm that the nano-FAU zeolite enables fast and efficient CO₂ capture compared to micron-sized zeolite. The stacked nano-zeolites with hierarchical pore structure not only shorten the diffusion path but also facilitate the surface permeation process, which contributes to improved diffusion kinetics. This work provides a valuable strategy for the development of CO₂ adsorption materials with high mass transfer rates.