Institutional Repository [SANDBOX]
Technical University of Crete
EN  |  EL

Search

Browse

My Space

Chemical and thermal modification of natural HEU-type zeolitic materials from Armenia, Georgia and Greece

Christidis Georgios, D. Moraetis, E. Keheyan, L. Akhalbedashvili, N. Kekelidze, R. Gevorkyan, H. Yeritsyan, H. Sargsyan

Simple record


URIhttp://purl.tuc.gr/dl/dias/F68D9AD2-21B3-430D-9374-734B0C70060B-
Identifierhttps://doi.org/10.1016/S0169-1317(03)00150-9-
Languageen-
Extent13 pagesen
TitleChemical and thermal modification of natural HEU-type zeolitic materials from Armenia, Georgia and Greeceen
CreatorChristidis Georgiosen
CreatorΧρηστιδης Γεωργιοςel
CreatorD. Moraetisen
CreatorE. Keheyanen
CreatorL. Akhalbedashvilien
CreatorN. Kekelidzeen
CreatorR. Gevorkyanen
CreatorH. Yeritsyanen
CreatorH. Sargsyanen
PublisherElsevieren
Content SummaryThree HEU-type zeolites from Armenia, Georgia and Greece formed from alteration of volcanic glass were treated with dilute KOH and subsequently either reacted with 6N HCl or heated at 700 jC. The raw materials and the reaction products were examined with X-ray diffraction (XRD), infrared spectroscopy (FTIR) and N2 gas adsorption. The cation exchange capacity (CEC) of the zeolites was also determined. The Greek zeolite has thermal characteristics typical for heulandite I, while the Armenian and Georgian zeolites have characteristics typical for heulandite III (clinoptilolite). KOH treatment increased slightly specific surface area (SSA) and microporosity due to dissolution of amorphous material. Acid treatment increased significantly both specific surface area and microporosity, as determined by t-plots, and decreased CEC. This is attributed to partial dissolution of both Si-tetrahedra and free linkages, which yielded secondary micropores and destroyed specific exchange sites of the HEU-type zeolites. Heating decreased both specific surface area and microporosity.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2015-10-01-
Date of Publication2003-
SubjectLasers, X-rayen
Subjectx ray lasersen
Subjectlasers x rayen
Bibliographic CitationG.E. Christidisa, D. Moraetis, E. Keheyan, L. Akhalbedashvili , N. Kekelidze , R. Gevorkyan , H. Yeritsyan , H. Sargsy ,"Chemical and thermal modification of natural HEU-type zeolitic materials from Armenia, Georgia and Greece ",Ap. Clay Sc.,vol.24 ,no.1 ,pp.79-91 ,2003.doi :10.1016/S0169-1317(03)00150-9en

Available Files

Services

Statistics