A collection of data used for the article "The Effect of Cation Exchange on the Pore Geometry of Zeolite L". In that work, we explore the effect of cation exchange on the pore dimensions, cation locations and water distribution within the 12R channel systems of LTL-type zeolites. Non-framework K+ cations are exchanged with larger Cs+ and smaller Li+ ions to physically alter pore openings and cavity volumes. Advanced structural characterisation provides insight into the locations of these extra-framework cations and water molecules.

Included in the dataset are GSAS (Generalized Structure Analysis System) refinement files for the zeolites; raw Rigaku SmartLab ASCII output files and Origin Project files from powder X-ray diffractometry; and crystal structures as CIF files.