New insight on the chemical role of water vapour in the ageing of activated carbon

Petit, J. C.; Bahaddi, Y.

doi:10.1016/0008-6223(93)90021-2

Cited by 12 publications

(7 citation statements)

References 15 publications

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“…O 2 can adsorb on carbon at low temperature, as it is used for ASA measurements, leading to oxygenated functions with a wide range of thermal stability. Works from references [10] and [32] concluded that water vapor can react with oxygenated groups to form new functions that are more reactive with O 2 than the pristine oxygenated functions. It must be noticed that even at very low concentrations, impurities may have an influence on oxidation rate [6].…”

Section: Oxidation In Wet Airmentioning

confidence: 99%

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Oxidation behavior at moderate temperature under dry and wet air of phenolic resin-derived carbon

et al. 2017

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International audienceThe oxidation behavior of carbon materials has been investigated at temperatures less than 773 K using isothermal thermogravimetric analyses under dry and wet air. Bulk samples obtained by the pyrolysis of phenolic resin have been characterized using X-ray diffraction and elementary analysis. X-ray photoelectron spectroscopy and Raman spectroscopy have been performed to analyze the surface and subsurface. The carbon structure has a poor organization state and a gradient in the oxygen concentration and structure between the surface and the bulk is revealed. The material is more reactive under wet air than dry air in terms of oxidation rates as determined between 623 and 773 K. The apparent activation energies are respectively 122 ± 6 kJ/mol in dry air and 102 ± 6 kJ/mol in wet air

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Section: Oxidation In Wet Airmentioning

confidence: 99%

“…The reaction between pure water vapor and carbon at temperatures below 773 K is considered as negligible. In the presence of oxygen, some discrepancies in published results can be noticed such as the decrease or increase of reactivity, depending on the nature of carbon samples [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Oxidation behavior at moderate temperature under dry and wet air of phenolic resin-derived carbon

et al. 2017

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“…This is most likely due to the fact that carbon atoms in SWNTs are present as surface-atoms only, which brings out the 1-D electronic properties thus differentiating nanomaterials from bulk materials. The thermodynamically stable state is obviously related to the ambient conditions, notably humidity, oxidizing air pollutants and radiation which are known to build oxygen on most common carbons [46,47]. Their effects on nanocarbons merit further examination.…”

Section: Temperature (°C)mentioning

confidence: 98%

Aging of nanocarbons in ambient conditions: Probable metastability of carbon nanotubes

Yang

Kim

Meyer

et al. 2009

Journal of Colloid and Interface Science

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“…For example, carbon materials are susceptible to chemical adsorption of water or oxygen. [21][22][23][24][25] For gas separation applications (e.g., pressure-swing adsorption), it is well-documented that carbon materials experience severe transport losses under humid and/or oxygen environments. 26,27 Often, the drastic loss in transport rates is accompanied by no change or a slight increase in selectivity.…”

Section: Introductionmentioning

confidence: 99%

“…Physical adsorption is a reversible process, whereas chemical adsorption might or might not be reversible but would require very high temperatures to break chemical bonds to desorb penetrants. For example, carbon materials are susceptible to chemical adsorption of water or oxygen. − …”

Section: Introductionmentioning

confidence: 99%

Effect of Condensable Impurities in CO₂/CH₄ Gas Feeds on Carbon Molecular Sieve Hollow-Fiber Membranes

Koros

Miller

2003

Ind. Eng. Chem. Res.

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The presence of vapor impurities in gas streams presents problems for both polymeric and carbon materials. For natural gas processing applications, it is suspected that condensable hydrocarbons can cause significant performance declines for polymer membranes. This paper investigates the effect of these condensable vapor impurities on the performance of carbon molecular sieve (CMS) hollow-fiber membranes. Toluene and n-heptane were separately used as representative aromatic and paraffinic impurities, respectively, in 10% CO 2 /90% CH 4 gas feed streams. Shell-side feed pressures of up to 900 psia and temperatures of 35 and 50 °C were used. Experimental results reveal that the CMS membranes maintained CO 2 /CH 4 selectivity with a maximum of 20% reduction in CO 2 permeance during exposure to gas feeds containing these impurities, in comparison to "clean" gas feeds without these impurities. Furthermore, a simple in situ regeneration procedure of moderate heating (70-90 °C) with dry N 2 purge gas resulted in almost complete recovery of CO 2 permeance without loss of CO 2 /CH 4 selectivity. Comparisons with polyimide membrane performance in similar adverse environments are also presented. The robustness and regeneration capabilities of the CMS fibers offer noteworthy advantages over polyimide fibers, which can display significant losses in membrane performance under similar conditions.

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New insight on the chemical role of water vapour in the ageing of activated carbon

Cited by 12 publications

References 15 publications

Oxidation behavior at moderate temperature under dry and wet air of phenolic resin-derived carbon

Oxidation behavior at moderate temperature under dry and wet air of phenolic resin-derived carbon

Aging of nanocarbons in ambient conditions: Probable metastability of carbon nanotubes

Effect of Condensable Impurities in CO₂/CH₄ Gas Feeds on Carbon Molecular Sieve Hollow-Fiber Membranes

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New insight on the chemical role of water vapour in the ageing of activated carbon

Cited by 12 publications

References 15 publications

Oxidation behavior at moderate temperature under dry and wet air of phenolic resin-derived carbon

Oxidation behavior at moderate temperature under dry and wet air of phenolic resin-derived carbon

Aging of nanocarbons in ambient conditions: Probable metastability of carbon nanotubes

Effect of Condensable Impurities in CO2/CH4 Gas Feeds on Carbon Molecular Sieve Hollow-Fiber Membranes

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Product

Resources

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Effect of Condensable Impurities in CO₂/CH₄ Gas Feeds on Carbon Molecular Sieve Hollow-Fiber Membranes