Double interaction between ammonia and NaY zeolite and migration of Na + upon adsorption of ammonia evidenced by neutron diffraction

F. Gilles, J. L. Blin, C. Mellot-Draznieks, A. K. Cheetham, B. L. Su

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

The crystal structure of NaY + ND3 has been determined at 20 K by Rietveld analysis of powder neutron diffraction data in space group Fd-3m. The cations were located at site I' (8), site II (32) and at a third site (21) in the α-cage around (0.71, -0.83, 0.25). This reveals a significant migration of the cations from the site I, which is totally emptied, and the site I' to large cages. The sites I and I' are known to be favorable cation sites in bare NaY. All the ND3 detected are located in the α-cage in electrostatic interaction with the Na+-counter-ions and in hydrogen bonding interaction with the framework oxygen atoms. It is for the first time that this double interaction is experimentally evidenced on cationic zeolite with ammonia These interactions provoke a deformation of the C3v molecular symmetry of the ammonia molecule.

langue originaleAnglais
Pages (de - à)1757-1762
Nombre de pages6
journalStudies in surface science and catalysis
Volume154 B
Etat de la publicationPublié - 1 déc. 2004

Empreinte digitale Examiner les sujets de recherche de « Double interaction between ammonia and NaY zeolite and migration of Na <sup>+</sup> upon adsorption of ammonia evidenced by neutron diffraction ». Ensemble, ils forment une empreinte digitale unique.

  • Contient cette citation