NDLI: Mobility of Cations and Guest Compounds in Cesium-Exchanged and Impregnated Zeolites Y and X Investigated by High-Temperature MAS NMR Spectroscopy

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Mobility of Cations and Guest Compounds in Cesium-Exchanged and Impregnated Zeolites Y and X Investigated by High-Temperature MAS NMR Spectroscopy

Content Provider	Semantic Scholar
Author	Hunger, Michael Schenk, Ursula Buchholz, Andreas
Abstract	Through the application of high-temperature 23Na and133Cs magic-angle spinning (MAS) NMR spectroscopy, the mobility of sodium and cesium ions in dehydrated zeolites Y and X in the sodium form, after exchange with cesium cations and after impregnation with cesium hydroxide, has been investigated. At temperatures typical for heterogeneous catalysis on basic zeolites Y and X, sodium and cesium cations exhibit a high mobility and are not rigidly located at their cation positions. Starting at a temperature of 570 K, a chemical exchange of sodium cations in supercages and sodalite cages occurs. At 770 K, sodium cations located at SI positions in the hexagonal prisms are involved in a chemical exchange with sodium cations in sodalite units. 133Cs MAS NMR spectroscopy of zeolites CsNaY and CsNaX indicates that the cesium exchange starts at 380-420 K. Starting at 380 K, a chemical exchange of the cesium atoms contributing to guest compounds with cesium cations located at cation positions in the zeolite cages was observed. For the cesium exchange processes in zeolites CsNaY/CsOH and CsNaX/CsOH occurring at 420 -770 K, activation energies of Ea ) 85 ( 10 and 115( 10 kJ/mol, respectively, were determined.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://itc-web.itc.uni-stuttgart.de/hunger/bilder/Paper86.pdf
Language	English
Access Restriction	Open
Subject Keyword	Aluminum Hydroxide 40 MG/ML / Magnesium Hydroxide 40 MG/ML / Simethicone 4 MG/ML Oral Suspension Angle Closure Glaucoma Cations Cesium Contribution DUOXA1 gene Dehydration Energy, Physics Fertilization Hydroxide Ion International System of Units Ions Sodium Spectroscopy, Near-Infrared Zeolites kilojoule (kJ)
Content Type	Text
Resource Type	Article

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