High-Pressure Water Intrusion Investigation of Pure Silica RUB-41 and S-SOD Zeolite Materials

Saada, Mohamed Ali; Soulard, Michel; Marler, Β.; Gies, Hermann; Patarin, Joël

doi:10.1021/jp109064e

Cited by 44 publications

(42 citation statements)

References 31 publications

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“…Zeolite adsorbents play an important role in separation technology, industrial catalysis and pollution control [1][2][3][4][5][6]. Siliceous zeolites are hydrophobic and organophilic crystalline silica molecular sieves [7][8][9]. These materials can provide an energetically uniform and nonpolar environment for adsorption of relatively small gas molecules and hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

Adsorption equilibria of CO2 and small hydrocarbons in AEI-, CHA-, STT-, and RRO-type siliceous zeolites

Pham

Lobo

2016

Microporous and Mesoporous Materials

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AEI, CHA, and STT siliceous zeolites and RUB-41 (RRO) were prepared with low concentration of internal silanols and were characterized by X-ray diffraction, N2 adsorption isotherms, electron microscopy, and 29 Si MAS NMR spectroscopy. Adsorption isotherms of methane, ethylene, ethane, propylene, propane, and CO2 were measured volumetrically on siliceous zeolites AEI, CHA, RRO, and STT at various temperatures ranging from 273 K to 323 K up to a pressure of 101.3 kPa. The Clausius-Clapeyron equation was used to calculate the isosteric heats of adsorption. The amount adsorbed depends strongly on adsorbate polarizability in the low-pressure region, and on the adsorbent micropore volume in the high-pressure region. Adsorption entropy losses are independent of temperature and increase with increasing adsorption enthalpy. RRO showed the highest pure-component selectivity of CO2 over CH4, and potential for the separation of the natural gas mixtures; AEI, CHA, and RRO-type materials showed potential for the kinetic separation of propylene/propane.

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Section: Introductionmentioning

confidence: 99%

Adsorption equilibria of CO2 and small hydrocarbons in AEI-, CHA-, STT-, and RRO-type siliceous zeolites

Pham

Lobo

2016

Microporous and Mesoporous Materials

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“…A summary of energetic performances of pure-silica zeolites with different crystalline structures was previously reported. 16 Most of the studied "zeosil-water" systems display a spring behavior, however some of them show a shock-absorber (RRO) 11 or bumper (*BEA 2 , IFR 10 ) , behavior. The *BEA-type zeolite is characterized by a threedimensional channel system with 12-membered ring (MR) openings (0.56 and 0.66-0.77 nm).…”

Section: Introductionmentioning

confidence: 99%

Drastic change of the intrusion–extrusion behavior of electrolyte solutions in pure silica *BEA-type zeolite

Ryzhikov

Khay

Nouali

et al. 2014

Phys. Chem. Chem. Phys.

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High pressure water and electrolyte solutions intrusion-extrusion experiments in pure-silica *BEA-type zeolite (zeosil β) were performed in order to study the performances of these systems in energy absorption and storage. The "zeosil β-water" system displays a bumper behavior with an intrusion pressure of 53 MPa and an absorbed energy of 8.3 J g(-1). For the "zeosil β-LiCl aqueous solutions" systems the intrusion pressure increases with the LiCl concentration to 95, 111 and 115 MPa for 10, 15 and 20 M solution, respectively. However, for concentrations above 10 M, a transformation of the system behavior from bumper to shock-absorber is observed. The zeolite samples were characterized by several structural and physicochemical methods (XRD, TGA, solid-state NMR, N2 physisorption, ICP-OES) before and after intrusion-extrusion experiments in order to understand the influence of the LiCl concentration on the intrusion-extrusion behavior. It is shown that the intrusion of water and LiCl solutions with low concentration leads to the formation of Si-(OSi)3OH groups, whereas no defects are observed under intrusion of concentrated LiCl solutions. A possible mechanism of LiCl solution intrusion based on separate intrusion of H2O molecules and Li(H2O)x(+) ions is proposed.

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“…ref. 21); in other cases, hysteresis is observed during the extrusion stage (RUB-41, ITQ-7) 22 and zeosils behave as shock absorbers. An irreversible behavior, with water molecules trapped in the micropores upon pressure release, is reported for ITQ-4, which behaves as a bumper.…”

Section: Introductionmentioning

confidence: 99%

Pressure-induced penetration of guest molecules in high-silica zeolites: the case of mordenite

Arletti

Leardini

Vezzalini

et al. 2015

Phys. Chem. Chem. Phys.

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A synthetic high-silica mordenite (HS-MOR) has been compressed in both non-penetrating (silicone oil, s.o.) and penetrating [methanol : ethanol : water (16 : 3 : 1) (m.e.w.), water : ethanol (3 : 1) (w.e.), and ethylene glycol (e.gl.)] pressure transmitting media (PTM). In situ high-pressure (HP) synchrotron X-ray powder diffraction (XRPD) experiments allowed the unit cell parameters to be followed up to 1.6, 1.8, 8.4, and 6.7 GPa in s.o., w.e., m.e.w., and e.gl., respectively. Moreover, e.gl. was also used as a PTM in in situ HP Raman and ex situ IR experiments. The structural refinement of HS-MOR compressed in e.gl.at 0.1 GPa -the lowest investigated pressure -revealed the presence of 3.5 ethylene glycol molecules per unit cell. The infrared spectrum of the recovered sample, after compression to 1 GPa, is consistent with the insertion of ethylene glycol molecules in the pores. XRPD and Raman spectroscopy experiments performed under pressure indicated the insertion of a small number of guest molecules. Ethylene glycol is partially retained inside mordenite upon pressure release. A symmetry lowering was observed in s.o. above 0.8 GPa, while above 1.6 GPa the patterns indicated a rapid loss of long range order. From ambient pressure (P amb ) to 1.6 GPa, a high cell volume contraction (DV = À9.5%) was determined. The patterns collected with penetrating PTM suggested the penetration of guest molecules into the porous host matrix, starting from a very low P regime. The entrapment of PTM molecules inside micropores contributes to the stiffening of the structure and, as a consequence, to the decrease of the compressibility with respect to that measured in s.o. From the structural point of view, HS-MOR reacts to compression and to the penetration of different guest species with appropriate framework deformations. Interestingly, ethylene glycol is partially retained inside mordenite upon pressure release, which is of importance for potential application of this composite material.

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High-Pressure Water Intrusion Investigation of Pure Silica RUB-41 and S-SOD Zeolite Materials

Cited by 44 publications

References 31 publications

Adsorption equilibria of CO2 and small hydrocarbons in AEI-, CHA-, STT-, and RRO-type siliceous zeolites

Adsorption equilibria of CO2 and small hydrocarbons in AEI-, CHA-, STT-, and RRO-type siliceous zeolites

Drastic change of the intrusion–extrusion behavior of electrolyte solutions in pure silica *BEA-type zeolite

Pressure-induced penetration of guest molecules in high-silica zeolites: the case of mordenite

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