Gas permselectivity of carbonized polypyrrolone membrane

Kita, Hidetoshi; Yoshino, Makoto; Tanaka, Kazuhiro; Okamoto, Ken‐ichi

doi:10.1039/a700048k

Cited by 54 publications

(30 citation statements)

References 7 publications

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“…Figure shows the empirical selectivity/permeability upper bounds for O 2 /N 2 (Figure a), CO 2 /CH 4 (Figure b), and H 2 /CH 4 (Figure c) separations, as defined by Robeson in 2008 for polymeric membranes, together with the results obtained in this article and a comparison with some results reported in the literature . Recently, Zhang and Koros reported an ultraselective CMSM for CO 2 /CH 4 , N 2 /CH 4 , He/CH 4 , and H 2 /CH 4 gas separations .…”

Section: Resultssupporting

confidence: 65%

Carbon Membranes with Extremely High Separation Factors and Stability

et al. 2019

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For some time, carbon molecular sieve membranes (CMSMs) have been promoted as energy‐efficient candidates for gas separation due to their high selectivity, permeability, and stability in chemically aggressive environments. Nevertheless, these membranes have not yet been made into commercial products due to a significant decrease in performance when exposed to humidity and/or oxygen. Herein, disruptive CMSMs with extremely high separation performance and stability, even in the presence of humidity, are reported. The carbon membranes are prepared from a renewable, low‐cost precursor with a single carbonization step. Water vapor adsorption/desorption studies demonstrate that these membranes have a linear water vapor adsorption isotherm, characteristic of a homogeneous distribution of hydrophilic sites on the pore surfaces, allowing for water molecules to hop continuously between sites and avoiding the formation of pore‐blocking water clusters. These results are a breakthrough toward bringing this new type of membrane to a commercial level.

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Section: Resultssupporting

confidence: 65%

Carbon Membranes with Extremely High Separation Factors and Stability

et al. 2019

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“…polyimide [41], Matrimid polyimide [42], polypyrrolone [43], BTDAeODA polyimide [44,45], and PFA [46]. Briceño et al [47] coated TiO2 macroporous tubes in one step with matrimid and pyrolyzed at 550 o C-700 o C under nitrogen.…”

Section: Introductionmentioning

confidence: 99%

Composite-alumina-carbon molecular sieve membranes prepared from novolac resin and boehmite. Part II: Effect of the carbonization temperature on the gas permeation properties

Tanco

Tanaka

Mendes

2015

International Journal of Hydrogen Energy

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The influence of carbonization temperature on the permeation properties and aging of thin (4 m) supported carbon molecular sieve membranes (c-CMSM), prepared from in house synthesized novolac phenolic resin loaded with boehmite nanoparticles, were studied. Just after membrane carbonization (fresh membrane), high permeance to N2 and O2 and low O2/ N2 permselectivities were observed; the highest permeations were observed for carbonization end temperatures between 500 o C and 700 o C. After leaving the c-CMSM 1 day in the air, a large decrease in the permeation and considerable increase in the permselectivity were observed due to the reduction of the pore size by oxygen chemisorption and water physical adsorption; the permeability to H2 and H2/N2 ideal permselectivity for a mem-brane carbonized at 550 o C are close to palladium membranes for low temperature (<100 o C). The effect of the permeation characteristics of the membranes carbonized at various temperatures and the removal of water adsorbed in the pores by heat treatment were studied.

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“…They are also outstanding insulators with high thermal stability and turned to be conductors after pyrolyzed at elevated temperatures. The excellent combinational properties have attracted much attention for applications such as gas/fluid separating membranes, packaging materials in microelectronics and conducting materials . More importantly, as compared with PIs, PPys have better alkaline hydrolytic resistance, which has been revealed in our lab .…”

Section: Introductionmentioning

confidence: 64%

Fluorinated polybenzimidazopyrrolones with excellent alkaline‐hydrolysis resistance

Tao

Liu

Fan

et al. 2013

J of Applied Polymer Sci

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polybenzimidazopyrrolones (polypyrrolones, PPys) were synthesized via a two-step polycondensation procedure. The inherent viscosities of the precursors, poly(amide amino acid) (PAAA), ranged from 0.39 dL/g to 0.54 dL/g. All the FPPys were amorphous. The freestanding FPPy films could be prepared, which exhibited good thermal stability with the glass transition temperature of 315-389 C, the temperatures of 5% weight loss (T 5% ) of 497-535 C in nitrogen and residual weight retention at 700 C over 60%. All the FPPy films exhibited excellent alkaline-hydrolysis resistance which retained their original shapes and toughness after boiling 7 days in 10% sodium hydroxide solution. Also after boiling 8 h in 10% sodium hydroxide solution, the tensile strength could retain as high as 56% of the original values. The alkaline-hydrolysis resistance was much better than the polyimides which had similar chemical structures.

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Gas permselectivity of carbonized polypyrrolone membrane

Cited by 54 publications

References 7 publications

Carbon Membranes with Extremely High Separation Factors and Stability

Carbon Membranes with Extremely High Separation Factors and Stability

Composite-alumina-carbon molecular sieve membranes prepared from novolac resin and boehmite. Part II: Effect of the carbonization temperature on the gas permeation properties

Fluorinated polybenzimidazopyrrolones with excellent alkaline‐hydrolysis resistance

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