In situ time-resolved X-ray diffraction in combination with the Rietveld method was used to study the contraction/expansion behavior of a BaY faujasite zeolite during dehydration and NO 2 adsorption/desorption reactions. The adsorption of water and NO 2 molecules induced a significant contraction of the zeolite unit cell. The unexpected contraction of the unit cell was closely related to the amount of water and NO x species (NO +, NO 2, NO 3 -) inside the framework. The reaction H 2O + NO 2 → NO 3 - + H + had a substantial effect on the structural properties of the BaY system. The NO 3 - groups produced a shift in the position of the Ba cations and a reduction in the zeolite unit cell.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry