Surface and sorption properties of active -carbons

Dubinin, M. M.; Zaverina, E. D.

doi:10.1007/bf01167331

Cited by 23 publications

(12 citation statements)

References 1 publication

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“…The use of CO 2 as a probe molecule at 0 ˚C is recommended for the characterisation of the narrow micropores to avoid underestimation of the pore volume by N 2 adsorption at -196 ˚C [34]. The micropore volume (W 0 ) and the micropore surface area (S DR ) were determined by the Dubinin-Radushkevich (DR) equation [35] assuming a density of the adsorbed phase of 1.023 cm 3 g -1 , a cross sectional area of 0.187 nm 2 and an affinity coefficient of 0.36. The average micropore width (L 0 ) was calculated through the Stoeckli-Ballerini equation [36].…”

Section: Methodsmentioning

confidence: 99%

Production of microporous biochars by single-step oxidation: Effect of activation conditions on CO2 capture

et al. 2014

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1 1 2 3 4 5 AbstractThere is an urgent need to develop materials and processes that reduce the energy penalty 6 associated to the CO 2 capture step. Biochars are appealing adsorbents for post-combustion 7 CO 2 capture applications due to their low cost, stability in moisture conditions and 8 microporous nature. Series of carbon adsorbents were prepared from almond shells and olive stones by single-step activation with air at 400-500 ˚C, and with lower O 2 concentration in the activating gas, 3-5%, at higher temperatures (500-650 ˚C). This process entails energy savings compared to conventional activation with carbon dioxide or steam. It has been found that the pore size distribution can be tailored by adequately selecting the activating conditions.Carbons obtained under lower oxygen partial pressures and higher temperatures present narrow microporosity, which is essential for the adsorption of CO 2 at low partial pressures.These appealing low-cost adsorbents have competitive CO 2 working capacities and high CO 2 /N 2 equilibrium selectivity in conditions that can be considered representative for post-combustion CO 2 capture, thus showing potential for this application.

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Section: Methodsmentioning

confidence: 99%

Production of microporous biochars by single-step oxidation: Effect of activation conditions on CO2 capture

et al. 2014

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“…These were obtained in a TriStar 3000 apparatus from Micromeritics. The total pore volume, V p , was estimated from the amount of N 2 adsorbed at a relative pressure of 0.99, and the micropore volume, V DR , was calculated from the Dubinin-Radushkevitch method [54]. The BET surface area is also shown in Table 1 for comparative purposes.…”

Section: Adsorbent Preparation and Characterisationmentioning

confidence: 99%

Green coffee based CO2 adsorbent with high performance in postcombustion conditions

Plaza

González

Pevida

et al. 2015

Fuel

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“…The total pore volume (V p ) was estimated from the amount of nitrogen adsorbed at a relative pressure of 0.99. The Dubinin-Radushkevich (DR) equation [25] was used to estimate the total micropore volume from the adsorption isotherm of N 2 at -196 °C (V DR-N2 ). The average micropore width (L) was calculated by means of the Stoeckli-Ballerini equation [26].…”

Section: Methodsmentioning

confidence: 99%

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

González

Plaza

Rubiera

et al. 2013

Chemical Engineering Journal

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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Surface and sorption properties of active -carbons

Cited by 23 publications

References 1 publication

Production of microporous biochars by single-step oxidation: Effect of activation conditions on CO2 capture

Production of microporous biochars by single-step oxidation: Effect of activation conditions on CO2 capture

Green coffee based CO2 adsorbent with high performance in postcombustion conditions

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

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