Preparation of carbon molecular sieve membranes by KOH activation for gas separation

Zhang, Xiaoyong; Li, Rui; Hu, Haijun; Zheng, Min

doi:10.1016/j.carbon.2012.02.075

Cited by 2 publications

(1 citation statement)

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“…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.

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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.

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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.

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show abstract

Pore size control of microporous carbon membranes by post-synthesis activation and their use in a membrane reactor for dehydrogenation of methylcyclohexane

Hirota

Ishikado

Uchida

et al. 2013

Journal of Membrane Science

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Preparation of carbon molecular sieve membranes by KOH activation for gas separation

Cited by 2 publications

References 0 publications

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

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

Pore size control of microporous carbon membranes by post-synthesis activation and their use in a membrane reactor for dehydrogenation of methylcyclohexane

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