Influence of the desilication process on the acidity of HZSM-5 zeolite

► Mesopore creation in three different HZSM-5 zeolites was performed via desilication. ► Acidity was assessed by microcalorimetric and thermokinetic data. ► ZSM-5 with SiO2/Al2O3=23 proved to be the least susceptable to mesopore creation. ► Acidity of samples with SiO2/Al2O3=50 and 80 remained mostly unchanged by desilication, while the surface diffusion was improved. The influence of the alkaline treatment on the acidity of zeolite ZSM-5 (SiO2/Al2O3=23, 50 and 80) modified by desilication was investigated. The samples were characterized by X-ray diffraction, low temperature adsorption of nitrogen and solid-state 27Al MAS NMR. Acidity of the samples was investigated using microcalorimetry-volumetry of ammonia adsorption at 423K. Acid sites accessibility and intracrystalline diffusion were estimated by the thermokinetic parameter. The desilication process was shown to be Si/Al ratio dependant. Relative enhancement of mesopore surface decreased in the following order of SiO2/Al2O3: 50>80>23. Pore size distribution broadened and mesopore sizes increased with increasing Si/Al ratio. For samples with SiO2/Al2O3=50 and 80 almost full preservation of acid sites strength and distribution was achieved. Significant alteration of the acidity was found for the mesoporous sample with SiO2/Al2O3=23. Thermokinetic parameter values indicate facilitated intracristalline diffusion for mesoporous samples.