The acidity and stability of ZSM-22 zeolite structure have been studied by thermal analysis. The activation energy calculated by Ozawa method to the events related to thermodecomposition was 18.44 kJ.mol-1. The value of the pre-exponential factor A was 2.2746. Its textural properties have been determined by nitrogen adsorption desorption analysis, whose results indicated microporous properties, with surface area 257 m².g-1, micropore volume 0.041 cm³.g-1 and pore diameter 32.6 Å. Luminescence analyses, using europium as probe, suggest that the acidity is distributed uniformly within the zeolite structure.
ZSM-22 zeolite; acidit; Ozawa method
