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 Posted: Sun 16:33, 19 Dec 2010 Post subject: air jordan shoes cheap Secondary growth synthesis |
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FAU zeolite secondary growth method Synthesis and characterization of membrane
. Preparationoffaujasitemembranesandtheirpermeationproperties [J]. SepPutTechnol ,2001,25:261-268 .112 lNikolakisV, XomeritakisG, AbibiA. Growthofafauja-site--typezeolitemembraneanditsapplicationinthesep-arationofsaturated/unsaturatedhydrocarbonmixtures [J]. JMembrSci ,2001,[link widoczny dla zalogowanych],184:209-219. [13] Zhang Xiongfu, LIU Hai-ou, KingLunyeung, and so on. Clear Solutions secondary growth NaA zeolite membrane thickness of the growth mechanism and the control synthesis [J]. Chem, 2005,26 (5) :806-810. WANGJiping,[link widoczny dla zalogowanych], LjULOuan, SHAOGuolin, LIUChang, WANGJinqu (StateKeyLaboratoryofFineChemicals,[link widoczny dla zalogowanych], InstituteofAdsorptionandInorganicMembrane, DalianUniversityofTechnology, Dalian116012, China) Abstract: ContinuousultrafinecrystalFAUmembranesweresynthesizedhydrothermallyontheoutersurfaceofa-aluminasupporttube (12n'lIno. D,[link widoczny dla zalogowanych], and8n'lIni. D.). Themolarcompositionofthestartinggelwas46Na20: 12.8SiCh: 1A1, 03:4500 H2O. Surface-modifiedtubeswereseededwithzeoliteXcrystalspriortomembranesynthesis. Theseedlayerwithuniformcrystalsizethatwas38larger38theaverageporediameterofthealuminasupportsonthesubstratefavoredtheformationofacontinuoustop-layerzeolitemembraneduringthegrowth. Thesubstratesurfacewasimprovedsignificantly,[link widoczny dla zalogowanych], and3uniformandsmoothseedlayerwasformedbyseeding. TheouterSUlfaceofthetubeiscompletelycoveredwithzeolitecrystalsandthethicknessofthemembraneisabout6-7um. ThemeasuredpermeabilityofH2isabout1.46 ¡Á 10-6molt (m2 ? s ? Pa), andtheidealselectivityofH2/SF6is9.67, whichishigherthantherespectiveKnudsendiffusionratioof8.54. Themechanismofmembraneformationwasinvestigated. Keywords: FAU - typezeolite; zeolitemembrane; hydrothermalsynthesis; crystalseeds; mechanism
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