Abstract
Natural chabazite from N.E. Azerbaijan, Iran, was ion-exchanged to give K 3.2Na 0.75Al 3.8Si 8.2O 24, n H 2O and Ag 3.7Al 3.8Si 8.3O 24, m H 2O respectively. After exchange crystals maintain the R3̄m symmetry with cell dimensions a = 9,459(9) A ̊ , α = 94.06(7) o and a = 9.421 (10) A ̊ , a = 94.20(8) o for the K- and Ag-exchanged chabazites. Full matrix least-squares refinement reduced the R index to 0.052 for (K)chab and 0.084 for (Ag)chab on the basis of 618 and 551 independent reflections. In both (Ag)- and (K)chab, the cations essentially occupy a site on the triad axis, in the large cavity facing the 6-ring oxygens of D6R units (site I) and a site near the 8-ring windows (site IV). In (K)chab an electron density peak is found near site IV, which is interpreted as due to another cation site (IV'). In (Ag)chab only 61% of the ions have been located in sites (I) and (IV), the remainder were assumed to be spread out in the zeolite cages.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
