Synthesis of carbon molecular sieves by activation and coke deposition

Vyas, S.N.; Patwardhan, S. R.; Vijayalakshmi, S.; gangadhar, Bathula

doi:10.1016/0016-2361(93)90115-i

Cited by 27 publications

(4 citation statements)

References 6 publications

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“…Molecular sieving carbon having a fibrous shape and controlled pore size has been recognized as the best adsorbent for pressure swing adsorption (PSA) application because of its rapid adsorption/desorption rate and large adsorption capacity. − Pore size control has been examined in a variety of ways by many different researchers. − …”

Section: Introductionmentioning

confidence: 99%

Carbon Deposition from Benzene and Cyclohexane onto Active Carbon Fiber To Control Its Pore Size

et al. 1996

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In this paper, we describe the investigation of chemical vapor deposition (CVD) of carbon from benzene and cyclohexane on a particular pitch-based active carbon fiber (ACF) at different deposition temperatures as a means of controlling the pore size of ACF in order to induce true molecular sieving capability and to discuss the mechanism of carbon deposition. This study showed that the specific temperature range 700−800 °C was very effective. In this range, deposition of amorphous carbon was restricted to the pore wall and became saturated at the level of 11% weight increase, as further deposition stopped. This treatment greatly enhanced the molecular sieve separation of CH4 from CO2. Reduction of pore size appeared to be limited by the thickness of the benzene plane, since no further carbon deposit took place when the pore could no longer accept benzene. Higher temperatures allowed deposition to occur on the outer surface of ACF, which plugged the pore completely on extended reaction time. Cyclohexane was found to be inferior to benzene as a carbon precursor, as it decomposed too rapidly in the gas phase at the temperature range used and precipitated the carbon plugging the pores. Thus, high molecular sieving selectivity was not obtained.

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Section: Introductionmentioning

confidence: 99%

Carbon Deposition from Benzene and Cyclohexane onto Active Carbon Fiber To Control Its Pore Size

et al. 1996

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“…CMS can be prepared from a wide variety of porous carbons e.g. lignocellulosic biomass [158], coal [159] or porous activated carbon fibres [156,160]. However, CVD conditions as temperature, duration of deposition, vapour flow rate and composition must be accurately optimized for avoiding the excess of carbon deposition driving to a complete pore blocking.…”

Section: Carbon Molecular Sievesmentioning

confidence: 99%

Nanoporous Carbons with Tuned Porosity

Ania

Raymundo-Piñero

2019

Nanoporous Materials for Gas Storage

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“…Adsorption capacity of CMS which is associated with the high micropore volume is developed during the activated carbon production. In another investigation conducted by Vyas et al [29], the possibility of CVD of CH 4 over indigenous bituminous coal-derived activated carbon was studied over a temperature of 750 to 780 °C. The induction of such properties in CMS is highly influenced by process parameters such as deposition temperature and time as well as depositing agent flow rate.…”

Section: Characterization Of Carbon Molecular Sievementioning

confidence: 99%

Production of carbon molecular sieves from palm shell through carbon deposition from methane

Mohammadi

Najafpour

Mohamed

2011

CI&CEQ

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The possibility of production of carbon molecular sieve (CMS) from palm shell as a waste lignocellulosic biomass was investigated. CMS samples were prepared through heat treatment processes including carbonization, physiochemical activation and chemical vapor deposition (CVD) from methane. Methane was pyrolyzed to deposit fine carbon on the pore mouth of palm shell-based activated carbon to yield CMS. All the deposition experiments were performed at 800 ºC, while the methane flow rate (100, 200, 300 mL min-1 CH4 diluted in 500 mL min-1 N2) and deposition time (30 to 60 min) were the investigated parameters. The textural characteristics of the CMSs were assessed by N2 adsorption. The largest BET surface area (752 m2 g-1), micropore surface area (902.2 m2 g-1) and micropore volume (0.3466 cm3 g-1) was obtained at the CH4 flow rate of 200 mL min-1 and deposition time of 30 min. However, prolonging the deposition time to 45 min yielded in a micropouros CMS with a narrow pore size distribution

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Synthesis of carbon molecular sieves by activation and coke deposition

Cited by 27 publications

References 6 publications

Carbon Deposition from Benzene and Cyclohexane onto Active Carbon Fiber To Control Its Pore Size

Carbon Deposition from Benzene and Cyclohexane onto Active Carbon Fiber To Control Its Pore Size

Nanoporous Carbons with Tuned Porosity

Production of carbon molecular sieves from palm shell through carbon deposition from methane

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