Comparative study between a CMS membrane and a CMS adsorbent: Part I—Morphology, adsorption equilibrium and kinetics

Campo, M.C.; Magalhães, Fernão D.; Mendes, Adélio

doi:10.1016/j.memsci.2009.08.045

Cited by 39 publications

(30 citation statements)

References 44 publications

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“…The microporosity of the composite-CMSM was assessed from the CO2 adsorption isotherm at 0 o C. The equilibrium values were obtained using a gravimetric method set up in a Rubotherm ® magnetic suspension balance (±10 -5 mg precision) as described elsewhere [63]. The samples were regenerated with helium at 70 o C before the measurement.…”

Section: Pore Size Characterizationmentioning

confidence: 99%

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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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Section: Pore Size Characterizationmentioning

confidence: 99%

“…The adsorption equilibrium values were obtained using a Rubotherm ® suspension magnetic balance [63]. The adsorption mechanism in micropores is known as micropore filling and has been well described by Dubinin and co-workers [68,69].…”

Section: Pore Size Characterizationmentioning

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 microporosity of the carbon membrane was assessed from the CO2 adsorption isotherm at 273 K. The equilibrium values were obtained using a gravimetric method set up, in a Rubotherm® magnetic suspension balance (±10 -5 mg precision) as described elsewhere [33].…”

Section: Pore Size Characterizationmentioning

confidence: 99%

“…In this paper the microporosity of the carbon molecular sieve membranes was characterized using adsorption equilibrium information obtained by the adsorption of CO2 at 0 o C. The adsorption equilibrium isotherm of CO2 was acquired by the gravimetric method in a Rubotherm® suspension magnetic balance with a precision of 10 -5 mg [33]. Fig.…”

Section: Pore Size Characterizationmentioning

confidence: 99%

Composite-alumina-carbon molecular sieve membranes prepared from novolac resin and boehmite. Part I: Preparation, characterization and gas permeation studies

Tanco

Tanaka

Rodrigues

et al. 2015

International Journal of Hydrogen Energy

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Supported composite alumina-carbon molecular sieve membranes (c-CMSM) were prepared from in house prepared novolac phenolic resin loaded with boehmite nanoparticles in a single dipping-drying-carbonization step. A porous a-alumina tube support was dipped into a N-methyl-2-pyrrolidone solution containing polymerized novolac resin loaded with boehmite, subsequently dried at 100 o C and carbonized at 500 o C under nitrogen environment. The structure, morphology and performance of the membranes were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), carbon dioxide adsorption and permeation of N2, O2, He, H2 and CO2. SEM showed carbon membranes with a thin and very uniform layer with a thickness of ca. 3 m CO2 adsorption isotherms indicated that the produced carbon membranes presented a micro-porous structure. The c-CMSM exhibited good gas separation properties. The permselectivity surpass the Robeson upper bound for polymeric membranes, especially regarding ideal permselectivities of pairs H2/N2 = 117, and He/O2 = 49. Aging effects were observed after membrane exposure to ambient air.However with a thermal treatment under nitrogen atmosphere the permeance of nitrogen increases.

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“…The pore size distribution and the porosity volume of the produced CMSM were obtained based on the adsorption equilibrium isotherm of CO2 at 0 ºC determined in a magnetic suspension balance as described elsewhere [41].…”

Section: Pore Size Characterizationmentioning

confidence: 99%

Preparation and characterization of carbon molecular sieve membranes based on resorcinol–formaldehyde resin

Rodrigues

Whitley

Mendes

2014

Journal of Membrane Science

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Carbon molecular sieve membranes (CMSM) were prepared on α-alumina supports by carbonization of a resorcinol-formaldehyde resin loaded with boehmite. Two series of carbon membranes produced at 500 ºC and 550 ºC carbonization end temperatures were prepared. The influence of the carbonization end temperature on the structure, morphology and performance of the membranes was examined by scanning electron microscopy, thermogravimetric analysis, CO2 adsorption and permeation to N2, O2, He, H2 and CO2 at temperatures from 25 ºC to 120 ºC. SEM photographs showed carbon membranes with a thin and very uniform layer and a thickness of ca. 3 m. Carbon dioxide adsorption isotherms revealed that all the produced carbon membranes have a welldeveloped microporous structure. Nevertheless, the membranes carbonized at 550 ºC have more ultramicropores and a narrower pore size distribution. The permselectivity of CMSM prepared at this temperature surpasses the Robeson upper bound for polymeric membranes, especially regarding ideal selectivities of pairs O2/N2 (O2 permeation rate: 9.85 x10 -10 mol m -2 s -1 Pa -1 and ideal selectivity: >11.5), H2/N2 (H2 permeation rate: 5.04 x10 -8 mol m -2 s -1 Pa -1 and ideal selectivity: >586) and He/N2 (He permeation rate: 4.68x10 -8 mol m -2 s -1 Pa -1 and ideal selectivity: >544).

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Comparative study between a CMS membrane and a CMS adsorbent: Part I—Morphology, adsorption equilibrium and kinetics

Cited by 39 publications

References 44 publications

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

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

Composite-alumina-carbon molecular sieve membranes prepared from novolac resin and boehmite. Part I: Preparation, characterization and gas permeation studies

Preparation and characterization of carbon molecular sieve membranes based on resorcinol–formaldehyde resin

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