Post-combustion CO2 capture with a commercial activated carbon: Comparison of different regeneration strategies

Please cite this article as: Marco-Lozar, J.P., Kunowsky, M., Suárez-García, F., Linares-Solano, A., Sorbent design for CO 2 capture under different flue gas conditions, Carbon (2014), doi: http://dx.doi.org/10.1016/j.carbon. 2014.01.064This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Sorbent design for CO AbstractCO 2 capture by solid sorbents is a physisorption process in which the gas molecules are adsorbed in a different porosity range, depending on the temperature and pressure of the capture conditions. Accordingly, CO 2 capture capacities can be enhanced if the sorbent has a proper porosity development and a suitable pore size distribution. Thus, the main objective of this work is to maximize the CO 2 capture capacity at ambient temperature, elucidating which is the most suitable porosity that the adsorbent has to have as a function of the emission source conditions. In order to do so, different activated carbons have been selected and their CO 2 capture capacities have been measured. The obtained results show that for low CO 2 pressures (e.g., conditions similar to post-combustion processes) the sorbent should have the maximum possible volume of micropores smaller than 0.7 nm. However, the sorbent requires the maximum possible total micropore volume when the capture is performed at high pressures (e.g., conditions similar to oxy-combustion or pre-combustion processes). Finally, this study also analyzes the important influence that the sorbent density has on the CO 2 capture capacity, since the adsorbent will be confined in a bed with a restricted volume.

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“…This is confirmed by the increasing number of papers published in recent years [4][5][6][9][10][11][12][13][14][15][16][17].…”

Section: Introductionsupporting

confidence: 55%

Sorbent design for CO2 capture under different flue gas conditions

Marco-Lozar

Kunowsky

Suárez-Garcı́a

et al. 2014

Carbon

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“…The composition of the effluent was analysed by a gas microchromatograph, and its flow rate was determined by adding a known flow of oxygen before the analysis section. Further details of the experimental device can be found elsewhere [29]. The adsorbents were regenerated before the adsorption experiments by purging the bed with helium at 150 ˚C for 1 h. Binary CO 2 /N 2 breakthrough curves were obtained by feeding a mixture with 14 % CO 2 (balance N 2 ) to the bed initially full of helium at the desired temperature.…”

Section: Methodsmentioning

confidence: 99%

“…which is commercialised as a CO 2 adsorbent [29]. At 25 ˚C, the CO 2 adsorption capacity of carbons AS and OS is between that of Brightblack TM at 20 and 30 ˚C, which is a carbon adsorbent specifically developed by ATMI Inc. to maximise CO 2 adsorption [35].…”

Section: Equilibrium Of Adsorption Of Pure Co 2 and Nmentioning

confidence: 99%

Sustainable biomass-based carbon adsorbents for post-combustion CO2 capture

González

Plaza

Rubiera

et al. 2013

Chemical Engineering Journal

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227

128

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Sustainable carbon adsorbents have been produced from biomass residues by single-step activation with CO 2 . The activation conditions were optimised to develop narrow micropores in order to maximise the CO 2 adsorption capacity of the carbons under post-combustion conditions. The equilibrium of adsorption of pure CO 2 and N 2 was measured between 0 and 50 ˚C up to 120 kPa for the outstanding carbons. The CO 2 adsorption capacity measured at low pressures is among the highest ever reported for carbon materials (0.6-1.1 mmol g -1 at 15 kPa and 25-50 ˚C), and the average isosteric heat of adsorption is typical of a physisorption process: 27 kJ mol -1 . Dynamic experiments carried out in a fixed-bed adsorption unit showed fast adsorption and desorption kinetics and a high CO 2 -over-N 2 selectivity. These adsorbents are able to separate a mixture with 14 % CO 2 (balance N 2 ) at 50 ˚C, conditions that can be considered as representative of post-combustion conditions, and they can be easily regenerated.

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“…Though carbonaceous adsorbents such as activated carbon (Plaza et al, 2010) have been widely used for CO 2 capture due to their wide availability, low cost, high thermal stability and low sensitivity to moisture, their application is limited to treat high pressure gases. The weak CO 2 adsorption of carbonaceous materials in a range of 50-120°C leads to high sensitivity in temperature and relatively low selectivity in operation.…”

Section: Physical Adsorbentmentioning

confidence: 99%

A Review of CO2 Capture by Absorption and Adsorption

Huang

Tan

2012

Aerosol Air Qual. Res.

1,457

875

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Global warming resulting from the emission of greenhouse gases, especially CO 2 , has become a widespread concern in the recent years. Though various CO 2 capture technologies have been proposed, chemical absorption and adsorption are currently believed to be the most suitable ones for post-combustion power plants. The operation of the chemical absorption process is reviewed in this work, together with the use of absorbents, such as the ionic liquid, alkanolamines and their blended aqueous solutions. The major concerns for this technology, including CO 2 capture efficiency, absorption rate, energy required in regeneration, and volume of absorber, are addressed. For adsorption, in addition to physical adsorbents, various mesoporous solid adsorbents impregnated with polyamines and grafted with aminosilanes are reviewed in this work. The major concerns for selection of adsorbent, including cost, adsorption rate, CO 2 adsorption capacity, and thermal stability, are compared and discussed. More effective and less energy-consuming regeneration techniques for CO 2 -loaded adsorbents are also proposed. Future works for both absorption and adsorption are suggested.

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Post-combustion CO2 capture with a commercial activated carbon: Comparison of different regeneration strategies

Cited by 321 publications

References 32 publications

Sorbent design for CO2 capture under different flue gas conditions

Sorbent design for CO2 capture under different flue gas conditions

Sustainable biomass-based carbon adsorbents for post-combustion CO2 capture

A Review of CO2 Capture by Absorption and Adsorption

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