An examination of how exposure to humid air can result in changes in the adsorption properties of activated carbons

Adams, Lance; Hall, C. Richard; Holmes, Richard J.; Newton, R.

doi:10.1016/0008-6223(88)90143-1

Cited by 60 publications

(26 citation statements)

References 11 publications

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“…In either case, the consequence is a greater cation exchange capacity per unit C found in soil with large amounts of bio-char compared with those with low amounts. Abiotic oxidation was also found to increase abundance of carboxylic acids on bio-char surfaces (Adams et al, 1988), and this may contribute to higher CEC after long periods of time in tropical ecosystems that experience high soil temperatures.…”

Section: Microbial Cycling Of Nutrients In Soils With Bio-charmentioning

confidence: 94%

Bio-Char Soil Management on Highly Weathered Soils in the Humid Tropics

Lehmann¹,

Rondón²

2006

Books in Soils, Plants, and the Environment

308

185

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Section: Microbial Cycling Of Nutrients In Soils With Bio-charmentioning

confidence: 94%

Bio-Char Soil Management on Highly Weathered Soils in the Humid Tropics

Lehmann¹,

Rondón²

2006

Books in Soils, Plants, and the Environment

308

185

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“…Although the hydrophobic nature of most activated carbons reduces this effect compared to zeolites, storage under humid conditions still results in a decrease of adsorption capacity. [87] This detrimental aging effect on the adsorption capacities of activated carbons in the presence of moisture has been attributed to a gradual oxidation of the carbon surface. [88] Wang carried out a comparative study on the effect of water on CO 2 adsorption isotherms at 275 K of two different activated carbons that had different pore size distributions, a coconut shell carbon with micropores and a bamboo carbon with micro-and mesopores.…”

Section: Effect Of H 2 O On the Carbon Adsorption Capacitiesmentioning

confidence: 99%

Adsorbent Materials for Carbon Dioxide Capture from Large Anthropogenic Point Sources

2009

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Since the time of the industrial revolution, the atmospheric CO(2) concentration has risen by nearly 35 % to its current level of 383 ppm. The increased carbon dioxide concentration in the atmosphere has been suggested to be a leading contributor to global climate change. To slow the increase, reductions in anthropogenic CO(2) emissions are necessary. Large emission point sources, such as fossil-fuel-based power generation facilities, are the first targets for these reductions. A benchmark, mature technology for the separation of dilute CO(2) from gas streams is via absorption with aqueous amines. However, the use of solid adsorbents is now being widely considered as an alternative, potentially less-energy-intensive separation technology. This Review describes the CO(2) adsorption behavior of several different classes of solid carbon dioxide adsorbents, including zeolites, activated carbons, calcium oxides, hydrotalcites, organic-inorganic hybrids, and metal-organic frameworks. These adsorbents are evaluated in terms of their equilibrium CO(2) capacities as well as other important parameters such as adsorption-desorption kinetics, operating windows, stability, and regenerability. The scope of currently available CO(2) adsorbents and their critical properties that will ultimately affect their incorporation into large-scale separation processes is presented.

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“…However, water vapor does adsorb when present at high concentrations due to adsorbate-adsorbate interactions that lead to cluster formation and eventual pore filling in activated carbon. [28] Adams [29] and Linders [27] separately showed that little water is absorbed on activated carbon below 30 % RH, with adsorption strongly increasing above 45 %. The binary adsorption of an organic solvent and water vapor in activated carbon is influenced by the miscibility of the two compounds in the adsorbed phase.…”

mentioning

confidence: 99%