42 research outputs found
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1ST LOW-TEMPERATURE N-15 NUCLEAR-MAGNETIC-RESONANCE STUDY OF NITROGEN PHYSISORPTION CONDENSATION IN MICROPOROUS SOLIDS
NMR chemical shifts of molecules physisorbed on two distinct sites
We propose methods for determining the chemical shifts of molecules physically adsorbed on two fairly different sites when these species are in fast exchange. As example we study the adsorption of xenon on Na36 Ni10Y zeolite
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USE OF 129-XE NMR AND HRADS TECHNIQUES TO STUDY COKING AND DECOKING OF HY ZEOLITES
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ANALYSIS OF THE MICROPOROSITY OF NASCENT POLYETHYLENE - XE-129 NMR AND HIGH-RESOLUTION ADSORPTION
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THE USE OF N-15 NMR FOR THE UNDERSTANDING OF NITROGEN PHYSISORPTION
Détermination de la bêta-2-microglobuline dans les liquides biologiques par immunoanalyse : comparaison RIA, immunochémiluminescence et immunoturbidimétrie
Xe-129 NMR of adsorbed xenon and H-1 NMR imaging: New methods to study the diffusion of gaseous hydrocarbons in a fixed bed of zeolite
Xe-129 NMR of adsorbed xenon used as a probe and H-1 NMR imaging have been used to study the diffusion of hydrocarbons (benzene, n-hexane, paraxylene) during their adsorption or desorption in a fixed bed of zeolite crystallites. The simulation of experimental Xe-129 spectra using the nonuniform or the shrinking core models gives the concentration profiles of hydrocarbons, in the bed and in the zeolite crystallites, during their adsorption and leads to intracrystalline diffusion coefficients in good agreement with the literature. The H-1 NMR imaging allows one to visualize the progression of the diffusing molecules in the zeolite bed and also to determine their intracrystalline diffusion coefficients in the simplest cases