PDF Publication Title:
Text from PDF Page: 012
information can be found in a comprehensive review of silver clusters and chemistry in zeolites by Sun and Seff.16 The location of the extraframework silver in relation to the aluminosilicate framework is of primary importance for elucidating the effect of silver clustering on the adsorptive characteristics of the zeolite. This is not a trivial endeavor. Numerous studies have been undertaken to identify the location of Ag+ ions and Ag-clusters in argentiferous zeolites. These have mostly been for Ag-A and have included X-ray diffraction methods9,10,13,14 and far-infrared spectroscopy.12,17 It was found that, for dehydrated, fully Ag+-exchanged faujasite-type zeolites, the silver molecules were distributed among the six-ring sites (SI, SI′, and SII for faujasites) and, for samples with high Al content, in the SIII locations. Gellens et al.14 and Baker et al.12 showed the simultaneous occupancy of sites SI and SI′ by linear (Ag+-Ag0-Ag+) clusters. In this work we have synthesized Ag+ ion-exchanged zeolites and treated these materials in ways which promote the formation of intra-crystalline silver clusters. Silver cations and clusters were quantitatively located using Rietveld refinement of neutron powder diffraction data. We have then evaluated the resulting nitrogen adsorptive characteristics of these materials and related adsorptive capacity to the cation/cluster locations within each zeolite. Experimental Details Materials. The zeolites used in this work, LSX zeolite (Si/Al =1.0, Praxair, No. 16193-42), X zeolite (Si/Al = 1.25, Linde, Lot 945084060002) and Y zeolite (Strem, Lot 128671-S), were obtained from commercial sources as binderless, hydrated powders and 12PDF Image | PSA USING SUPERIOR ADSORBENTS
PDF Search Title:
PSA USING SUPERIOR ADSORBENTSOriginal File Name Searched:
789503.pdfDIY PDF Search: Google It | Yahoo | Bing
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)