Adsorption of Gases on Carbon Molecular Sieves

Vyas, S.N.; Patwardhan, S. R.; Vijayalakshmi, S.; Ganesh, K.Sri

doi:10.1006/jcis.1994.1421

Cited by 24 publications

(16 citation statements)

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“…[56] Among the carbonbased adsorbents reported in the literature, activated carbons are primarily reviewed here. More recently, some new classes of carbon materials have emerged as adsorbents and the interested reader is directed to several original works concerning adsorption on carbon molecular sieves [57][58][59][60][61][62][63][64][65][66][67] and carbon nanotubes. [68][69][70][71][72][73][74][75] Preparation of activated carbons from raw materials typically consists of two steps: carbonization and activation.…”

Section: Carbon Structural Characteristicsmentioning

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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Section: Carbon Structural Characteristicsmentioning

confidence: 99%

Adsorbent Materials for Carbon Dioxide Capture from Large Anthropogenic Point Sources

2009

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“…[20][21][22][23][24][25][26] Its surface properties can vary considerably, but its approximate pure-CO 2 sorption capacity can be as high as 10 wt % and its carbon dioxide/nitrogen (CO 2 / N 2 ) selectivity is on the order of 10, at 1 bar and 25°C. [12][13][14][15] Other types of carbonaceous sorbents, such as charcoal and coal, have been studied in a different CO 2 context; [16][17][18][19] however, they have not been explored or proposed for carbon capture from flue gas yet. For example, in the context of displacing coal-bed methane with CO 2 , it has been shown that virgin coal has a higher capacity for CO 2 than it does for methane, 19 again, only at elevated pressures.…”

Section: Introductionmentioning

confidence: 99%

Flue-Gas Carbon Capture on Carbonaceous Sorbents: Toward a Low-Cost Multifunctional Carbon Filter for “Green” Energy Producers

Radosz

Krutkramelis

et al. 2008

Ind. Eng. Chem. Res.

205

137

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A low-pressure Carbon Filter Process (patent pending) is proposed to capture carbon dioxide (CO 2 ) from flue gas. This filter is filled with a low-cost carbonaceous sorbent, such as activated carbon or charcoal, which has a high affinity (and, hence, high capacity) to CO 2 but not to nitrogen (N 2 ). This, in turn, leads to a high CO 2 /N 2 selectivity, especially at low pressures. The Carbon Filter Process proposed in this work can recover at least 90% of flue-gas CO 2 of 90%+ purity at a fraction of the cost normally associated with the conventional amine absorption process. The Carbon Filter Process requires neither expensive materials nor flue-gas compression or refrigeration, and it is easy to heat integrate with an existing or grassroots power plant without affecting the cost of the produced electricity too much. An abundant supply of low-cost CO 2 from electricity producers is good news for enhanced oil recovery (EOR) and enhanced coal-bed methane recovery (ECBMR) operators, because it will lead to higher oil and gas recovery rates in an environmentally sensitive manner. A CO 2 -rich mixture that contains some nitrogen is much less expensive to separate from flue-gas than pure CO 2 ; therefore, mixed CO 2 /N 2 -EOR and CO 2 /N 2 -ECBMR methods are proposed to maximize the overall carbon capture and utilization efficiency.

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“…Several methods have been developed for CMS production such as pyrolysis (Braymer et al 1994), activation and carbon vapour deposition (CVD) (Vyas et al 1994;Nguyen and Do 1995;Villar-Rodil et al 2005;Freitas and Figueiredo 2001;Kawabuchi et al 1996). Among them, the CVD approach has been found particularly suitable and has received considerable attention.…”

Section: Introductionmentioning

confidence: 99%

Preparation of carbon molecular sieves from palm shell: effect of benzene deposition conditions

Ahmad

2009

Adsorption

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Application of carbon molecular sieve (CMS) for gas separation has been found much attention recently. In this work, CMS was prepared from locally available palm shell through carbonization, steam activation and carbon vapour deposition (CVD) technique. After carbonization step, the char produced was subjected to steam activation at various activation times. The activated carbon obtained at 53.2% burn-off, which contain the highest amount of micropore volume was further used in CVD step by using benzene vapour at various deposition conditions. The performance of CMSs produced was examined by assessing the adsorption kinetics of O 2 , N 2 , CO 2 and CH 4 gases. All CMS samples showed a small N 2 and CH 4 uptake compared to the O 2 and CO 2 . The suitable conditions for CVD were found at 800°C, 30 min and 30 vol% benzene of deposition temperature, time and benzene concentration, respectively. At this point the O 2 /N 2 and CO 2 /CH 4 uptake ratios arrived 7.1 and 16.0, respectively.

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Adsorption of Gases on Carbon Molecular Sieves

Cited by 24 publications

References 0 publications

Adsorbent Materials for Carbon Dioxide Capture from Large Anthropogenic Point Sources

Adsorbent Materials for Carbon Dioxide Capture from Large Anthropogenic Point Sources

Flue-Gas Carbon Capture on Carbonaceous Sorbents: Toward a Low-Cost Multifunctional Carbon Filter for “Green” Energy Producers

Preparation of carbon molecular sieves from palm shell: effect of benzene deposition conditions

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