Dehydration-Induced Water Disordering in a Synthetic Potassium Gallosilicate Natrolite.
A new potassium gallosilicate zeolite with a natrolite topology (approximate formula KGa- SiO·11.5HO) was synthesized under hydrothermal conditions and characterized as a function of temperature using monochromatic synchrotron X-ray powder diffraction and Rietveld analyses. Unlike the previously kno...
| Publicado en: | Journal of the American Chemical Society Vol. 129; no. 44; pp. 13744 - 13749 |
|---|---|
| Autores principales: | , , , , , , |
| Formato: | Artículo |
| Publicado: |
American Chemical Society
11/7/2007
|
| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=27483550&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 27483550 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 11/7/2007 vid: 129 iid: 44 pid: 997 pub: American Chemical Society artinfo: ui: 27483550 10.1021/ja075037z ppf: 13744 ppct: 5 formats: tig: atl: Dehydration-Induced Water Disordering in a Synthetic Potassium Gallosilicate Natrolite. aug: au: Yongjae Lee Sun Jin Kim Bull, Ivor Celestian, Aaron J. Parise, John B. Chi-Chang Kao Vogt, Thomas affil: Department of Earth System Sciences, Yonsei University, Seoul 120-749, Korea Nano-Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791, Korea BASF CATALYSTS LLC, 101 Wood Avenue, P.O. Box 770, Iselin, New Jersey 08830 Department of Geography and Geology, Western Kentucky University, Bowling Green, Kentucky 42101 Department of Geosciences, State University of New York, Stony Brook, New York 11794 National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973 NanoCenter and Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208 su: Potassium Zeolites Ions Optical diffraction Natrolite X-rays sug: subj: Potassium Zeolites Ions Optical diffraction Natrolite X-rays ab: A new potassium gallosilicate zeolite with a natrolite topology (approximate formula KGa- SiO·11.5HO) was synthesized under hydrothermal conditions and characterized as a function of temperature using monochromatic synchrotron X-ray powder diffraction and Rietveld analyses. Unlike the previously known tetragonal KGaSiO·6HO phase, the assynthesized material contains twice the amount of water molecules in an ordered arrangement throughout the channels in an orthorhombic (/222) symmetry. The ordered configuration of water molecules is stabilized below 300 K, whereas heating above 300 K results in a selective dehydration and subsequent disordering of water molecules in a tetragonal (/42d) symmetry. Above 400 K, the material transforms to a fully dehydrated tetragonal phase with a concomitant volume reduction of ca. 15%. The fully dehydrated material transforms back to its original state when rehydrated over a period of up to 2 weeks. The distribution of potassium cations within the channels remains largely unperturbed during the water rearrangements and their order-disorder transition within the channels. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2007 holdings: @attributes: islocal: N |
|---|