Aging of carbon membranes under different environments

Menendez, Ivan; Fuertes, Antonio B.

doi:10.1016/s0008-6223(00)00188-3

Cited by 107 publications

(65 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After exposure to CO 2 , a check run was performed with N 2 to assess any possible decrease in the membranes permeances. The presence of oxygenated functional groups on the surface of CMSM was reported by other authors [12][13][14], and the studies done in the scope of this work were to confirm the presence of such groups. CO 2 is electron-deficient and thus acts as a Lewis-acid [15].…”

Section: Soaking Time Effectsupporting

confidence: 77%

“…Aging is caused by oxygen chemisorption on the carbon surface, which reduces the membrane performance due to reduction of pore size [12]. The presence of oxygenated functional groups on the surface of CMSM was reported by other authors [12][13][14].…”

Section: International Journal Of Chemical Engineeringmentioning

confidence: 92%

“…CMSMs have two major disadvantages that still have to be overcome: mechanical brittleness and aging effects [4,12]. Aging is caused by oxygen chemisorption on the carbon surface, which reduces the membrane performance due to reduction of pore size [12].…”

Section: International Journal Of Chemical Engineeringmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Pyrolysis Parameters on the Performance of CMSM

Campo

Visser

Nijmeijer

et al. 2009

International Journal of Chemical Engineering

View full text Add to dashboard Cite

Carbon hollow fiber membranes have been prepared by pyrolysis of a P84/S-PEEK blend. Proximate analysis of the precursor was performed using thermogravimetry (TGA), and a carbon yield of approximately 40% can be obtained. This study aimed at understanding the influence of pyrolysis parameters-end temperature, quenching effect, and soaking time-on the membrane properties. Permeation experiments were performed with N 2 , He, and CO 2 . Scanning electron microscopy (SEM) has been done for all carbon hollow fibers. The highest permeances were obtained for the membrane submitted to an end temperature of 750• C and the highest ideal selectivities for an end temperature of 700 • C. In both cases, the membranes were quenched to room temperature.

show abstract

Section: Soaking Time Effectsupporting

confidence: 77%

Section: International Journal Of Chemical Engineeringmentioning

confidence: 92%

See 1 more Smart Citation

Influence of Pyrolysis Parameters on the Performance of CMSM

Campo

Visser

Nijmeijer

et al. 2009

International Journal of Chemical Engineering

View full text Add to dashboard Cite

show abstract

“…A few studies have shown that the separation performance of carbon membranes is strongly influenced by the choice of precursor materials and carbonization conditions [1][2][3][4][5]. At present, a variety of polymeric precursors, such as polyimide and derivatives [6][7][8][9][10][11], polyacrylonitrile (PAN) [12][13][14], phenol formaldehyde [15][16][17][18][19], polyvinylidene chloride-acrylate terpolymer [20] and poly (furfuryl alcohol) (PFA) [21][22][23][24][25][26], have been used to prepare carbon membranes and demonstrated better separation performance. Among these polymeric precursors, PAN was regarded as a potential precursor and had been used to prepare carbon membranes owing to its high carbon content, low cost and wide application in the production of carbon fibers.…”

Section: Introductionmentioning

confidence: 99%

Effect of carbonization atmosphere on the structure changes of PAN carbon membranes

et al. 2008

View full text Add to dashboard Cite

PAN carbon membranes were prepared by carbonizing the initial PAN membranes in vacuum and Ar at different temperatures. FTIR, Raman and XRD were applied to study the influence of carbonization atmosphere on the structure changes of PAN carbon membranes. The variations in adsorption peaks of FTIR, the intensity, position and FWHM of the Raman peaks, and microcrystallite parameters from XRD (e.g., d 002 , Lc and La) are correlated with the structure change of PAN carbon membranes. Analyses results reveal that vacuum atmosphere can produce PAN carbon membranes with higher order degree than those in Ar atmosphere, although the structures of PAN carbon membranes prepared in the two atmospheres are both amorphous. In addition, vacuum atmosphere can significantly accelerate the degradation reaction of PAN membranes and favors the preparation of carbon membranes with smaller pore size.

show abstract

“…For the separation of H2/methylcyclohexane and H2/toluene (dehydrogenated chemical of methylcyclohexane), larger pore sizes are favorable for improving H2 permeance but should be less than 0.6 nm since the kinetic diameters of methylcyclohexane and toluene are about 0.60 nm. Various post-synthesis treatments have been applied to control pore size and to improve the separation properties of microporous carbon membranes, including activation (oxidation) 11),25), 26) , chemical vapor deposition 27) 29) , pyrolysis 30) and coating 10), 31) . Activation is a common treatment used to control the pore size of carbon membranes.…”

Section: P O R E S I Z E C O N T R O L O F T H E F Fa C a R B O N Memmentioning

confidence: 99%

Pore Size Control of Microporous Carbon Membranes and Application to H<sub>2</sub> Separation

Hirota

Nishiyama

2016

J. Jpn. Petrol. Inst.

View full text Add to dashboard Cite

Three methods of efficient pore size control for microporous carbon membranes were developed, (1) vaporphase synthesis of furfuryl alcohol (FFA) carbon membranes, (2) pore size control by post-activation and (3) quaternary ammonium salt-mediated method for the direct synthesis of microporous carbon membranes with large pores. (1) At first, a H2-permselective FFA carbon membrane with pore size of 0.30 nm was prepared through optimization of the conditions of FFA deposition and carbonization process. (2) Next, the FFA carbon membranes were activated using various gases and vapors such as H2, CO2, O2 and steam (H2O). Different pore sizes and morphological changes were observed by changing the activation agent and temperature. After activation using H2 at 700 , the pore size of the microporous carbon membrane was increased from 0.30 to 0.45 nm. (3) Quaternary ammonium salt-mediated synthesis was developed for the direct synthesis of microporous carbon membranes with pore size larger than 0.40 nm. Using two types of cationic tertiary amines with different chain lengths, microporous carbon membranes with uniform pores of 0.4 nm and 0.5 nm were successfully synthesized. Using these methods, microporous carbon membranes with uniform pore sizes from 0.30 to 0.50 nm were successfully prepared, and were used in various H2 separation processes. These microporous carbon membranes showed superior H2-permselectivity in various H2 separation processes such as H2/CO, H2/CO2 and dehydrogenation of organic hydrides in a membrane reactor. The present techniques are expected to achieve precise pore size control of microporous carbon membranes.

show abstract

Aging of carbon membranes under different environments

Cited by 107 publications

References 18 publications

Influence of Pyrolysis Parameters on the Performance of CMSM

Influence of Pyrolysis Parameters on the Performance of CMSM

Effect of carbonization atmosphere on the structure changes of PAN carbon membranes

Pore Size Control of Microporous Carbon Membranes and Application to H<sub>2</sub> Separation

Contact Info

Product

Resources

About