Thermal decomposition of the natural zeolite stilbite

Rykl, D.; Pechar, F.

doi:10.1016/0144-2449(85)90132-0

Cited by 10 publications

(4 citation statements)

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“…Alternatively, the separate fractionation curves may simply reflect fractionations by different phases. Stilbite undergoes a series of phase transformations with increasing temperature (Rykl and Pechar 1985), transforming into metastilbite (see e.g. Feng 1991) and phase "B" of Alberti et al (1978) at ~ 200°C.…”

Section: Figurementioning

confidence: 99%

Isotope Geochemistry of Zeolites

Karlsson

2001

Reviews in Mineralogy and Geochemistry

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Section: Figurementioning

confidence: 99%

Isotope Geochemistry of Zeolites

Karlsson

2001

Reviews in Mineralogy and Geochemistry

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“…This weight loss can be credited to the decomposition of zeolite particles. According to Rykl and Pechar, the crystal lattice of zeolite changes at 260 °C and it decomposes into an amorphous phase above 470 °C [ 34 ]. The zeolite particles in Cl-Gly-0 decomposed at 410 °C.…”

Section: Resultsmentioning

confidence: 99%

“…Another significant weight loss which accounts for about 31% weight loss takes place at 415 • C. This weight loss can be credited to the decomposition of zeolite particles. According to Rykl and Pechar, the crystal lattice of zeolite changes at 260 • C and it decomposes into an amorphous phase above 470 • C[34]. The zeolite particles in Cl-…”

mentioning

confidence: 99%

CO2/CH4 Separation in Amino Acid Ionic Liquids, Polymerized Ionic Liquids, and Mixed Matrix Membranes

Selvaraj,

Wilfred

2024

Molecules

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The ability to efficiently separate CO2 from other light gases using membrane technology has received a great deal of attention due to its importance in applications such as improving the efficiency of natural gas and reducing greenhouse gas emissions. A wide range of materials has been employed for the fabrication of membranes. This paper highlights the work carried out to develop novel advanced membranes with improved separation performance. We integrated a polymerizable and amino acid ionic liquid (AAIL) with zeolite to fabricate mixed matrix membranes (MMMs). The MMMs were prepared with (vinylbenzyl)trimethylammonium chloride [VBTMA][Cl] and (vinylbenzyl)trimethylammonium glycine [VBTMA][Gly] as the polymeric support with 5 wt% zeolite particles, and varying concentrations of 1-butyl-3-methylimidazolium glycine, [BMIM][Gly] (5–20 wt%) blended together. The membranes were fabricated through photopolymerization. The extent of polymerization was confirmed using FTIR. FESEM confirmed the membranes formed are dense in structure. The thermal properties of the membranes were measured using TGA and DSC. CO2 and CH4 permeation was studied at room temperature and with a feed side pressure of 2 bar. [VBTMA][Gly]-based membranes recorded higher CO2 permeability and CO2/CH4 selectivity compared to [VBTMA][Cl]-based membranes due to the facilitated transport of CO2. The best performing membrane Gly-Gly-20 recorded permeance of 4.17 GPU and ideal selectivity of 5.49.

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“…The dehydration and rehydration processes of stilbite were also investigated by Aumento (1966) who showed that samples heated below 573 K were completely rehydrated whereas samples heated to 573-873 K were only partially rehydrated. Rykl and Pechar (1985) also reported that stilbite transforms into meta-stilbite at about 533 K and into an amorphous phase above 743 K. Joshi et al (1982) and Kasture et al (1997) also reported on stilbite and its thermal products from the Deccan trap region using XRD, DTA-TG, and IR spectroscopy. Cruciani et al (1997) studied the dehydration processes of stilbite using in situ synchrotron X-ray powder diffraction.…”

Section: Introductionmentioning

confidence: 88%

Dehydration of natural stilbite: An in situ FTIR study

Prasad

Murthy

2005

American Mineralogist

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The dehydration behavior of a natural stilbite sample from Poona (India) was investigated by in situ FTIR. The thermal induced variations of the water molecule bending (ν 2 ) mode around 1653 cm -1 , the stretching (ν 3 and ν 1 ) modes around 3587 and 3426 cm -1 , and the corresponding second-order modes in the wavenumber region 4000-8000 cm -1 were followed as indicative of the dehydration process. The observed spectral variations indicate that stilbite undergoes a transformation at about 448 K due to the loss of half of the original content of water molecules. The rehydration of stilbite is partial in samples heated up to 630 K. Concerning both the dehydration and rehydration behaviors of stilbite, our results are in concert with those proposed in the literature. In addition, the growth of a new mode around 4550 cm -1 is observed in the temperature range 430-650 K and may indicate the presence of hydroxyl groups created by the breaking of the T-O-T linkages.*

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Thermal decomposition of the natural zeolite stilbite

Cited by 10 publications

References 1 publication

Isotope Geochemistry of Zeolites

Isotope Geochemistry of Zeolites

CO2/CH4 Separation in Amino Acid Ionic Liquids, Polymerized Ionic Liquids, and Mixed Matrix Membranes

Dehydration of natural stilbite: An in situ FTIR study

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