Characterization of gas transport in selected rubbery amorphous polyphosphazene membranes

Orme, Christopher J.; Harrup, Mason K.; Luther, Thomas A.; Lash, Robert Paul; Houston, Kelly S.; Weinkauf, D. H.; Stewart, Frederick F.

doi:10.1016/s0376-7388(00)00690-6

Cited by 71 publications

(38 citation statements)

References 29 publications

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“…These membranes have resulted in CO 2 /H 2 selectivities as high as 10 in a polyphosphazene composed of poly(dichlorophosphazene) modified with 2-(2-methoxyethoxy)ethanol. 22 Similar 23,24…”

Section: Polymeric Membranes For Co 2 Permselective Separationmentioning

confidence: 93%

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 Co 2 Permselective Separationmentioning

confidence: 93%

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

Nenoff¹,

Spontak²,

Aberg³

2006

MRS Bull.

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“…Permeability data are available for arloxy- [30][31][32][33][34][35][36][37][38][39], alkoxy- [40,41] [36, [42][43][44][45], and alkyl-substituted [46] polyphosphazenes. Some limited gas data exist for amino-substituted polyphosphazenes [47][48][49][50][51][52] such as n-butylamino and nhexylamino-substituted polyphosphazenes that indicate very high permeability; however, data for these polyphosphazenes are inconsistent [53].…”

Section: Gas Separation Membranesmentioning

confidence: 99%

Transport Properties of Polyphosphazenes

Fried¹

2008

Polyphosphazenes for Biomedical Applications

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“…Condensability also plays an important role in gas permeation through polymeric membranes. Condensability (in °K) and kinetic parameters (in A) for gases of interest are [125] (149, 3.87). Hydrogen is more permeable than the smaller helium in amorphous polymeric membranes, due to its higher condensability.…”

Section: Polymeric Membranesmentioning

confidence: 99%

“…The inorganic backbone provides thermal and chemical stability to the polymer. They are thermally stable up to 400 °C [125]. Orme et al [125] investigated polyphosphazenes with three different functional groups of different hydrophilicity for the gas separation.…”

Section: Rubbery Polymeric Membranesmentioning

confidence: 99%

“…They are thermally stable up to 400 °C [125]. Orme et al [125] investigated polyphosphazenes with three different functional groups of different hydrophilicity for the gas separation. Functional groups attached are 2-(2-methoxyethoxy)ethanol (MEE) to provide a polar hydrophilicity, 4-methoxyphenol (4MP) to provide hydrophobicity and film forming abilities, and 2-allylphenol (2AP) for cross-linking.…”

Section: Rubbery Polymeric Membranesmentioning

confidence: 99%

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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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Characterization of gas transport in selected rubbery amorphous polyphosphazene membranes

Cited by 71 publications

References 29 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

Transport Properties of Polyphosphazenes

A Review of Carbon Dioxide Selective Membranes: A Topical Report

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