Synthesis and crystal structure of carbonate cancrinite Na8[AlSiO4]6CO3(H2O)3.4, grown under low-temperature hydrothermal conditions

Synthesis and characterization of the oxalate cancrinite-type zeolite

“…For the analysis of the PND data, the structural model previously presented by Hackbarth et al [9] was initially used using only the cancrinite framework of the model. The Si/Al framework refined stably with reasonable values for the fit parameters being achieved v 2 = 1.921, R wp = 3.42% and R p = 5.28%.…”

“…Samples were analyzed before and after removal of the organic components by heating to 600°C for 24 h. PND data were collected on the POLARIS time of flight instrument at ISIS (Oxfordshire, UK) at room temperature with a total collection time of 1 h at $180 lA. Finally, thermogravimetric data were collected on a Polymer Laboratories PL-STA from room temperature to 1000°C at 10°C per minute under a nitrogen atmosphere on a sample of $10.4 mg. and 1106 cm À1 characteristic of the cancrinite structure [9]. Bands at 1312, 1437 and 1626 cm À1 correspond to oxalate anions inside the cancrinite framework [10].…”

Perrhenate incorporation into binary mixed sodalites: The role of anion size and implications for technetium-99 sequestration

“…The resulting solids were characterized by bulk chemical analysis, X-ray diffraction, scanning electron microscopy, and X-ray absorption near edge structure (XANES) spectroscopy to determine the crystal structure, chemical composition, and morphology, and to confirm the rhenium (Re) oxidation state. Rhenium in the solid phase occurred predominately as [21]. The following parameters were allowed to vary: the background (8 parameters), unit cell, Na position, Re/anion occupancy, peak shape (5 parameters:…”

Microw Ave-Assisted Synthesis of Low-Silica/Alumina-Ratio Zeolites From Geothermal Silica

“…3(a)) shows ZC as the predominant phase (95%) and the presence of an amorphous material. Cancrinite synthesis has also been reported using a conventional hydrothermal process with the addition of chemical reagents [9][10][11] . When kaolin was used as a silica source for producing cancrinite, higher temperatures (200ºC) and longer crystallization times (48 h) were required 9 .…”

“…Because of the expansive use of zeolites in the chemical industry as adsorbents, cationic exchangers, and catalysts, among other important applications 8 , the development of low-cost methods for their manufacture is important. Zeolites have traditionally been prepared using long reaction times and high temperatures [9][10][11][12] . Cancrinite, for example, has been obtained at temperatures and crystallization times of approximately 200°C and 48 h 9 .…”