PDF Publication Title:
Text from PDF Page: 025
that there are triatomic linear clusters at the SI′-SI-SI′ location (this has been reported previously14) and diatomic clusters at SI′*-SII′ (or possibly triatomic clusters at SI′*-SII′- SII*). These two configurations are shown in Figure 7. The Ag(I′)-O3 interatomic distances, 2.64 Å for Ag-LSX-350 and 2.60 Å for Ag-LSX-450, is long for Ag+ in 3- coordination and is probably due to repulsion from the Ag in the SI location. Likewise, the Ag(II*)-O2 distances, 2.65 Å for Ag-LSX-350 and 2.60 Å for Ag-LSX-450, are likely due to repulsion from the silver at the simultaneous occupied SII′ site. Ag(II)-O2 and Ag(I′*)-O3 distances, at 2.19 Å to 2.23 Å are a bit low and are more consistent with Ag+ in 2-coordination than in the expected 3-coordination. The Ag(I′*)-O3 may be low due to repulsion from silver in the SII′ location. While each of the samples seem to contain diatomic clusters at Ag(I′*)-Ag(II′) (or at Ag(I′)-Ag(II′) for Ag-Y), only the Ag-LSX samples contained the expected triatomic cluster at the SI′-SI-SI′ locations. Neither the Ag-Y nor the Ag-X sample contained silver in the SII* location; but both Ag-LSX samples contained silver at this site. The Ag-LSX-350 sample contained 6 Ag in the SII* location while Ag-LSX-450 contained almost 9 Ag in the SII* location. This may be an indication of some thermally induced migration of Ag from SI′* to SII′ which in turn increases the population of Ag in SII* (due to repulsion). Migration of cations often occurs in zeolites when adsorbing water and during dehydration. Hydrated zeolites typically contain cations which are coordinated to both framework oxygen and zeolitic water molecules. This acts to maximize the coordination and thus to stabilize the position of the cation.28 Upon dehydration the coordination changes and the cations may migrate to different locations in order to obtain a more 25PDF 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 | RSS | AMP |