Gas separation properties of hybrid imide–siloxane copolymers with various silica contents

Smaïhi, M.; Schrotter, Jean‐Christophe; Lesimple, Chantal; Prevost, Isabelle; Guizard, C.

doi:10.1016/s0376-7388(99)00103-9

Cited by 90 publications

(37 citation statements)

References 34 publications

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“…While the permeabilities are relatively low, the results illustrate that the incorporation of particles typically used for size-sieving H 2 can generate a composite material (see Figure 3) capable of improved selectivity. Smaihi et al 18 generated hybrid imidesiloxane systems containing silica particles to achieve both high H 2 permeabilities and selectivities. Other noteworthy materials advances include polymer laminates such as a multilayer polysulfone/silicone rubber composite membrane yielding a high H 2 /N 2 selectivity at 50°C; 19 incorporation of a poly(ethylene oxide) layer into a polysulfone/silicone rubber composite, resulting in a H 2 /N 2 selectivity that is higher than the selectivity of any one of the integrated components at 35°C, 20 and alumina-supported styrene divinylbenzene with high H 2 /CH 4 selectivities.…”

Section: Polymeric Membranes For H 2 Permselective Separationmentioning

confidence: 99%

Membranes for Hydrogen Purification: An Important Step toward a Hydrogen-Based Economy

Nenoff¹,

Spontak²,

Aberg³

2006

MRS Bull.

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Production of pure molecular hydrogen is essential to the realization of the proposed “hydrogen economy” that could ultimately provide hydrogen as a clean, renewable source of energy; eliminate the industrialized world's dependence on petroleum; and reduce the generation of greenhouse gases linked to global warming. A crucial step in obtaining pure hydrogen is separating it from other gaseous compounds—mainly CO2—that often accompany hydrogen in industrial chemical reactions. Advanced membrane technology may prove to be the key to the successful, economical production of molecular hydrogen.Size-sieving glassy polymer membranes can separate H2 on the basis of its small size. Alternatively, reverse-selective rubbery polymers can expedite the passage and, hence, removal of CO2 due to its relatively high solubility in such membranes alone or in conjunction with dissociative chemical reactions. Transition-metal membranes and their alloys can adsorb H2 molecules, dissociate the molecules into H atoms for transport through interstitial sites, and subsequently recombine the H atoms to form molecular H2 again on the opposite membrane side. Microporous amorphous silica and zeolite membranes comprising thin films on a multilayer porous support exhibit good sorption selectivity and high diffusion mobilities for H2, leading to high H2 fluxes. Finally, carbon-based membranes, including carbon nanotubes, may be viable for H2 separation on the basis of selective surface flow and molecular sieving. A wide variety of materials challenges exist in hydrogen purification, and the objective of this issue of MRS Bulletin is to address those challenges and their potential solutions from basic principles.

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Section: Polymeric Membranes For H 2 Permselective Separationmentioning

confidence: 99%

Membranes for Hydrogen Purification: An Important Step toward a Hydrogen-Based Economy

Nenoff¹,

Spontak²,

Aberg³

2006

MRS Bull.

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“…They observed the highest permselectivity of CO 2 /N 2 with PTMOS-TMOS (molar composition 81 percent) and attributed this high selectivity to the enhanced chemical affinity between CO 2 and the membrane structure, due to an increased content of phenyl groups in the material. Smaihi et al [168] have prepared homogeneous hybrid polyimide-siloxane copolymers containing different silica proportions by polycondensation, imidization, and the sol-gel process composed of PMDA, aminoalkoxysilane, and TMOS. They used two coupling agents, aminoalkoxysilane to provide bonding between the imide portion and the silica inorganic portion -aminopropyltrimethoxysilane (APrTMOS), and aminopropylmethyldiethoxysilane (APrMDEOS).…”

Section: Hybrid Membranesmentioning

confidence: 99%

A Review of Carbon Dioxide Selective Membranes: A Topical Report

Shekhawat¹,

Luebke²,

Pennline³

2003

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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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“…These membranes may combine the advantages of material, processability and flexibility of polymer and stability and selectivity of inorganic/organic fillers [17]. Some of these nanofillers are silica [18][19][20][21][22], titania [23,24], fullerene (C60) [25] and carbon nanotubes [11]. Among all these materials CNTs have gained more interest because of their small size large length to diameter ratio, good mechanical, physical and chemical properties [26].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and NH3/N2 Gas Permeation Study of Nanocomposite Membranes

2016

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Carbon nanotubes have exceptional mechanical properties which make them very attractive for the development of composite membranes. In this research, NH 3 /N 2 gas permeation behavior of flat sheet composite membranes was examined. The cellulose acetate-multiwalled carbon nanotubes composite membranes were synthesized using solution casting method. The morphology and dispersion of carbon nanotubes were observed through SEM. However, the composite membranes were also characterized using several analytical techniques such as X-ray diffraction analysis, tensile testing analysis, and thermal gravimetric analysis. Characterization of these membranes depicted that carboxylic group functionalized MWCNTs are extremely compatible with CA. The permeation experiments were performed with NH 3 and N 2 to explore the host-guest interaction of MWCNTs with chosen gases. The permeability of NH 3 was found pronounced compared to N 2 . The NH 3 /N 2 selectivity up to 90 was documented.

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Gas separation properties of hybrid imide–siloxane copolymers with various silica contents

Cited by 90 publications

References 34 publications

Membranes for Hydrogen Purification: An Important Step toward a Hydrogen-Based Economy

Membranes for Hydrogen Purification: An Important Step toward a Hydrogen-Based Economy

A Review of Carbon Dioxide Selective Membranes: A Topical Report

Synthesis, Characterization and NH3/N2 Gas Permeation Study of Nanocomposite Membranes

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