Naslov
Diffusion of iodine into exchanged zeolite A and X

Autori
Mužic, Ana ; Sekovanić, Lavoslav ; Bronić, Josip ; Biljan, Tomislav ; Kontrec, Jasminka ; Subotić, Boris

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of abstracts / - Leipzig, 2005

Skup
Diffusion Fundamentals I

Mjesto i datum
Leipzig, Njemačka, 22.09.2005. - 24.09.2005

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
gas diffusion; host-guest interaction; zeolite

Sažetak
Ion-exchange of Na+ ions from zeolite with Ag and Zn cation from solution, and introduction of iodine into system distort zeolite A and ZX framework on certain SBU positions (4R, D4R, 6R, D6R) what can be detected by XRD and FTIR spectroscopy. Introduction of gas I2 at elevated temperature into zeolite shows 3 interactions: 1. Formation of the MeI with movable cation, 2. capture of elemental I2 (complexes of different size, even nanocrystals) within voids of ZA and ZX, 3. ionic form of iodine in complex reaction with MeI/zeolite framework obtained by disproportination of iodine molecules at 210 C. Strong interaction of iodine molecules with zeolite framevork and exchangeable cation (capturing of I2 molecules within zeolite voids) indicate anomalous diffusion. Therefore, ordinary equations for gas diffusion into zeolites are not suitable for determination of diffusion coefficients.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA