Interaction of H2O and NO2 with BaY Faujasite: Complex Contraction/Expansion Behavior of the Zeolite Unit Cell

October 28, 2004

Journal Article

Interaction of H2O and NO2 with BaY Faujasite: Complex Contraction/Expansion Behavior of the Zeolite Unit Cell

Abstract

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 NO2 adsorption/desorption reactions. The adsorption of water and NO2 molecules induced a significant contraction of hte zeolite unit cell. The unexpected contraction of the unit cell was closely related to the amount of water and NOx species (NO?, NO2, NO3?) inside the framework. The reaction H2O + NO2 --> NO3? + H? had a substantial effect on the structural properties of the BaY system. The NO3? groups produced a shift in the position of the Ba cations and a reduction in the zeolite unit cell.

Revised: January 11, 2006 | Published: October 28, 2004

Citation

Wang X., J. Hanson, J. Szanyi, and J.A. Rodriguez. 2004. Interaction of H2O and NO2 with BaY Faujasite: Complex Contraction/Expansion Behavior of the Zeolite Unit Cell. Journal of Physical Chemistry B. PNNL-SA-42568.