Properties of Synthesized, Ion-Exchanged, and Stabilized Zeolite Rho

Flank, William H.

doi:10.1021/bk-1977-0040.ch004

Cited by 9 publications

(6 citation statements)

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“…The thermogravimetric (TG) analysis curve of hydrated Na,Cs-Rho zeolite shows one broad dehydration step similar to that recorded by Flank (1977) (Fig. 1).…”

Section: Thermal Analysissupporting

confidence: 65%

“…The α-cages are centered on the corners and in the midpoint of the unit cell; thus, a system of two nonintersecting three-dimensional channels results. Cations such as Ag + , H + or D + , NH4, Li + , Na + , K + , Rb + , Cs + , Mg 2 + , Ca 2 + , Sr 2 + , Ba 2+ and La 3 + , can be exchanged into zeolite Rho (Flank, 1977;Barrer, Barri and Klinowski, 1980;McCusker, 1984;McCusker and Baerlocher, 1984;Fischer et al, 1986;Baur et al, 1987).…”

Section: Introductionmentioning

confidence: 99%

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Neutron powder diffraction study of a Na,Cs-Rho zeolite

Baur¹,

Bieniok²,

Shannon³

et al. 1989

Zeitschrift Für Kristallographie - Crystalline Materials

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Zeoüte Rho / Aluminosilicate framework distortion / Variation of pore size / Neutron powder diffraction / (Si, Al)-0 bond lengthsAbstract. The crystal structure of a Na, Cs-Rho zeolite was studied at 373 Κ (Na8.4Cs3.2Si36.4Aln.6O96 · 5D 2 0) by neutron powder diffraction and Rietveld profile analysis. It crystallizes in the noncentrosymmetric space group /43m and has a unit cell constant a = 14.6566(4) Â. The final residuals are R¡ = 9.65% and R wp = 8.01%. The distortion of the (Al,Si)0 2 -framework of this zeolite fits into the pattern established for other noncentrosymmetric Rho zeolites. Particularly, the ellipticity of the eight-ring and the pore size are strictly a function of the cell constant of the zeolite. The mean distance (Al,Si)-0 is observed to be 1.636 Â, in excellent agreement with the mean (Al,Si)-0 distance of 1.638 Â calculated for the Si and Al content of our sample.

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“…The thermogravimetric (TG) analysis curve of hydrated Na,Cs-Rho zeolite shows one broad dehydration step similar to that recorded by Flank (1977) (Fig. 1).…”

Section: Thermal Analysissupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Neutron powder diffraction study of a Na,Cs-Rho zeolite

Baur¹,

Bieniok²,

Shannon³

et al. 1989

Zeitschrift Für Kristallographie - Crystalline Materials

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“…Besides, a low intensity absorption peak identified at 794 cm −1 can be connected to Si-Al-O symmetrical stretching vibration. The characteristic absorption peak of double eight-ring external linkage in zeolite RHO was revealed at 588 cm −1 and 634 cm −1 [29,38]. As observed from Figure 5b for NH 2 -RHO, the absorption peak ranging from 3650-3200 cm −1 showed an increasing broadness compared to that of zeolite RHO.…”

Section: Comparison Of Zeolite Rho and Nh 2 -Rhomentioning

confidence: 64%

“…As can be seen in Figure 5 a for zeolite RHO, the FTIR spectrum portrayed a strong absorption peak in the range of 1250–950 cm −1 , which corresponds to Si–O and Al–O tetrahedra asymmetrical stretching vibration in the zeolite RHO particle [ 29 , 37 ]. Intense absorption peaks located in the range of 3650–3200 cm −1 and 1640 cm −1 indicated the presence of O–H stretching of adsorbed water molecules and O–H bending of lattice water in the zeolite RHO sample [ 38 ]. Besides, a low intensity absorption peak identified at 794 cm −1 can be connected to Si–Al–O symmetrical stretching vibration.…”

Section: Resultsmentioning

confidence: 99%

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Modified Zeolite/Polysulfone Mixed Matrix Membrane for Enhanced CO2/CH4 Separation

Anbealagan

Chew

et al. 2021

Membranes

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In recent years, mixed matrix membranes (MMMs) have received worldwide attention for their potential to offer superior gas permeation and separation performance involving CO2 and CH4. However, fabricating defect-free MMMs still remains as a challenge where the incorporation of fillers into MMMs has usually led to some issues including formation of undesirable interfacial voids, which may jeopardize the gas separation performance of the MMMs. This current work investigated the incorporation of zeolite RHO and silane-modified zeolite RHO (NH2–RHO) into polysulfone (PSf) based MMMs with the primary aim of enhancing the membrane’s gas permeation and separation performance. The synthesized zeolite RHO, NH2–RHO, and fabricated membranes were characterized by X-ray diffraction (XRD) analysis, Fourier transform infrared-attenuated total reflection (FTIR-ATR), thermogravimetric analysis (TGA) and field emission scanning election microscopy (FESEM). The effects of zeolite loading in the MMMs on the CO2/CH4 separation performance were investigated. By incorporating 1 wt% of zeolite RHO into the MMMs, the CO2 permeability and ideal CO2/CH4 selectivity slightly increased by 4.2% and 2.7%, respectively, compared to that of a pristine PSf membrane. On the other hand, a significant enhancement of 45% in ideal CO2/CH4 selectivity was attained by MMMs incorporated with 2 wt% of zeolite NH2-RHO compared to a pristine PSf membrane. Besides, all MMMs incorporated with zeolite NH2-RHO displayed higher ideal CO2/CH4 selectivity than that of the MMMs incorporated with zeolite RHO. By incorporating 1–3 wt% zeolite NH2-RHO into PSf matrix, MMMs without interfacial voids were successfully fabricated. Consequently, significant enhancement in ideal CO2/CH4 selectivity was enabled by the incorporation of zeolite NH2–RHO into MMMs.

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Characterization of small‐ and intermediate‐pore zeolites by means of temperature‐programmed desorption of amines

Merz¹,

Fetting

1996

Chem Eng & Technol

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Dedicated to Professor Dr. M. Baerns on the ocassion of his 60th birthday This paper presents results of temperature-programmed desorption (TPD) as a method for studying the acid and shape-selective properties of small-and intermediate-pore zeolites.A combination of an in situ infrared spectrometer and a downstream gas chromatograph for analyzing the desorption products is used to detect the desorption process. This is followed by a separate, newly installed microbalance facility.The studies show that a part of the amines, esp. dimethylamine (DMA) and trimethylamine (TMA), adsorbed on the zeolites undergo decomposition, disproportionation and carbonization reactions during the TPD measurement at elevated temperatures. Comparison of the microbalance measurements and the gas chromatographic results give a good picture of the extent of these reactions.

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Properties of Synthesized, Ion-Exchanged, and Stabilized Zeolite Rho

Cited by 9 publications

References 0 publications

Neutron powder diffraction study of a Na,Cs-Rho zeolite

Neutron powder diffraction study of a Na,Cs-Rho zeolite

Modified Zeolite/Polysulfone Mixed Matrix Membrane for Enhanced CO2/CH4 Separation

Characterization of small‐ and intermediate‐pore zeolites by means of temperature‐programmed desorption of amines

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