PDF Publication Title:
Text from PDF Page: 084
filtered aluminate solution. A silicate solution was prepared by dissolving sodium metasilicate pentahydrate (Na2SiO3 5 H2O, 98%, Sigma-Aldrich) in distilled water. The silicate solution was also filtered through 0.2 m syringe filters after dissolution of the sodium metasilicate pentahydrate. Thereafter, the aluminate and silicate solutions were mixed, and the resulting solution was stirred for 1 minute and a gel formed. The gel was then placed in a Teflon lined autoclave and synthesis was performed under autogeneous pressure at 115° C for three days. The crystals obtained were purified by repeated centrifugations (14,000 g) and redispersion in distilled water, four times in total. The crystals were subsequently used for SEM observations and as a reference for N2 adsorption and desorption at liquid nitrogen temperature. 2.2 Physical characterization The weight gain (gzeolite/gsample) was calculated by measuring the weight increase of the support before and after hydrothermal treatment. A Philips XL 30 scanning electron microscope (SEM) equipped with a LaB6 emission source was used for studies of surface morphology of crystals and films and also to measure film thickness. The monoliths were cut in the channel direction prior to SEM investigation. Images were recorded on samples covered with a thin layer of gold (about 10 nm) deposited by sputtering. For each structured adsorbent sample, more than ten SEM pictures were recorded at various locations (i.e. close to the walls, at the end and in the center) in order to fully appreciate the morphology of each sample. The selected SEM pictures shown in this paper are representative for each sample. The average particle size of 100 crystals in sample DC was estimated by measurements in SEM images to 7 m, with a standard deviation of 200 nm. Due to the size of these crystals, there are only macropores between these crystals (that can not be detected by nitrogen adsorption) and these crystals should thus be an ideal reference material for nitrogen adsorption measurements with minimum mesoporosity between the crystals. 68PDF Image | Structured Zeolite Adsorbents for PSA Applications
PDF Search Title:
Structured Zeolite Adsorbents for PSA ApplicationsOriginal File Name Searched:
structured-zeolites.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)