Gas permeation properties of ion-exchanged ZSM-5 zeolite membranes

Aoki, Kanna; Tuấn, Vũ Anh; Falconer, John L.; Noble, Richard D.

doi:10.1016/s1387-1811(00)00224-9

Cited by 62 publications

(22 citation statements)

References 12 publications

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“…This would result in a minimal hindrance towards di usion. Support for this is found in permeation studies through ZSM-5 membranes exchanged with cations of di erent size (Aoki et al, 2000). For a Si/Al ratio of 25, the ux di erence between H-and Na-ZSM-5 membranes is absent for molecules as SF 6 , and n-and i-butane.…”

Section: Estimation Of the DI Usion Length In The Nazsm-5-coated Beadmentioning

confidence: 74%

Determination of adsorption and diffusion parameters in zeolites through a structured approach

Delgado

Nijhuis

Kapteijn

et al. 2004

Chemical Engineering Science

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Temporal analysis of products (TAP) is a transient pulse-response technique that allows to extract kinetic information from reacting and adsorbing systems. In a previous work (Chem Eng Sci 57(2002) 1835), a detailed-transport model for the Multitrack set-up, a TAP-like system, was developed, which allows studying systems with a low bed resistance. The use of structured beds, having both a low bed resistance and small sorbent particles, is required to determine adsorption and di usion parameters when strong adsorption and slow di usion occurs. A method is presented to extend the range of measurable adsorption and di usion parameters in zeolitic sorbents in the TAP technique by a structured approach. Small zeolite crystals are coated on larger non-porous glass beads. Adsorption and di usion parameters for n-butane, SF6 and 3-methylpentane have been determined in MFI-type zeolites. Absolute di usivity values in the zeolite coating are estimated by using a well-deÿned silicalite sample as a reference to determine the e ective di usion length in the coating.Two criteria have been derived, one for the characteristic time for transport through the bed, 0:05 s ¡ t bed ¡ 4 s, and one for the ratio of the latter and the characteristic di usion time in the zeolite crystal, 0:01 ¡ ¡ 200t bed =(1 + t bed ), which should be satisÿed both to be able to determine values of the zeolite di usivity. ?

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Section: Estimation Of the DI Usion Length In The Nazsm-5-coated Beadmentioning

confidence: 74%

Determination of adsorption and diffusion parameters in zeolites through a structured approach

Delgado

Nijhuis

Kapteijn

et al. 2004

Chemical Engineering Science

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“…These supported zeolite membranes have a thin and continuing zeolite separation layer with the porous support providing mechanical strength to the membrane. Membranes of various zeolites, such as ZSM-5 [30][31][32][33][34][35][36][37], Y type [38][39][40][41][42][43], silicalite [44][45][46][47][48][49][50], A type [42,51,52], P type [53], modernite [33], and silicoaluminophosphate [54][55][56] have been synthesized on porous supports.…”

Section: Zeolite Membranesmentioning

confidence: 99%

“…Aoki et al [31] also studied ZSM-5 zeolite membranes (Si/Al = 25 and 600) ion-exchanged with various alkali and alkaline earth cations for gas permeation. They observed low gas permeances and permselectivities from ion-exchanged zeolite membranes.…”

Section: Zeolite Membranesmentioning

confidence: 99%

A Review of Carbon Dioxide Selective Membranes: A Topical Report

Shekhawat¹,

Luebke²,

Pennline³

2003

101

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The atmospheric concentration of anthropogenic carbon dioxide (CO 2 ) has been increasing since the start of industrialization in the mid 19th century, and the rate is increasing. It is highly unlikely that fossil fuel combustion, the main contributor to anthropogenic CO 2 , will be replaced in the foreseeable future. Therefore, CO 2 capture and storage offer a new set of options for reducing greenhouse gas emissions, in addition to the current strategies of improving energy efficiency and increasing the use of renewable energy resources. Carbon dioxide selective membranes provide a viable energy-saving alternative for CO 2 separation, since membranes do not require any phase transformation. This review examines various CO 2 selective membranes for the separation of CO 2 and N 2 , CO 2 and CH 4 , and CO 2 and H 2 from flue or fuel gas. This review attempts to summarize recent significant advances reported in the literature about various CO 2 selective membranes, their stability, the effect of different parameters on the performance of the membrane, the structure and permeation properties relationships, and the transport mechanism applied in different CO 2 selective membranes. Finally, the future direction for CO 2 selective membranes is proposed. Hybrid organic-inorganic membranes have become an expanding field of research, as the introduction of organic molecules can improve the characteristics of a matrix. Hydrotalcite-type materials, perovskite-type oxides, lithium zirconate, and lithium silicate are also suggested as candidate materials for high temperature CO 2 selective membranes.

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“…The term zeolite was originally coined in 1756 by Swedish mineralogist Axel Fredrik Cronstedt and they are widely used in Ion exchange, adsorption, separation, catalyst and cracking [1][2][3][4] .Artificial zeolite has Higher purity and its structure is more stable than natural zeolite, and its Si/Al ratio can be controlled by the amount of reactant, so the study of synthetic methods is a important issue in the research of zeolite [5,6].The methods are divided into two types and the classification is weather a template is used in the method or not [7]. ZSM-5 is an aluminosilicate zeolite belonging to the pentasil family of zeolites.…”

Section: Introductionmentioning

confidence: 99%

Influence of Reaction Conditions on the Crystal Size and Yield in Hydrothermal Synthesis of ZSM-5 Molecular Sieve Zeolites

Wang¹,

Zheng²

2016

Proceedings of the 2016 3rd International Conference on Materials Engineering, Manufacturing Technology and Control

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Abstract. Nanocrystalline ZSM-5 can be used as catalysts or catalyst supports, and it has higher catalytic efficiency compared with micro-sized ZSM-5 zeolite because of its large specific surface area, so it attracted wide attention. This paper mainly discusses the hydrothermal synthesis of nanocrystalline ZSM-5.Aluminium nitrate, tetrapropyl ammonium hydroxide(TPAOH) and tetraethyl orthosilicate(TEOS) are used as main reactants and reaction conditions are studied such as Si/Al, dispersion medium(water, ethanol and butanol),reaction temperature and reaction time so as to probe how they affect the size and yield of product. The best reaction conditions are confirmed by experiments and ZSM-5 zeolite has a average size of 60nm and yield over 90% prepared with ethanol as dispersion medium at 100℃for 48 hours. This study lays foundation for next-step preparation of the catalyst.

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Gas permeation properties of ion-exchanged ZSM-5 zeolite membranes

Cited by 62 publications

References 12 publications

Determination of adsorption and diffusion parameters in zeolites through a structured approach

Determination of adsorption and diffusion parameters in zeolites through a structured approach

A Review of Carbon Dioxide Selective Membranes: A Topical Report

Influence of Reaction Conditions on the Crystal Size and Yield in Hydrothermal Synthesis of ZSM-5 Molecular Sieve Zeolites

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