Dependence of the Microporosity of Activated Carbons on the Lignocellulosic Composition of the Precursors

Román, S.; Ledesma, B.; Álvarez-Murillo, A.; Al-Kassir, A.; Yusaf, Talal

doi:10.3390/en10040542

Cited by 21 publications

(16 citation statements)

References 17 publications

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“…In addition, AC-H2O exhibits mesopores in its internal structure. Such results were also observed by Roman et al during the preparation of activated carbons from almond tree pruning through water vapor activation [27]. This results clearly indicates that the physical activation modes are different for H2O and CO2.…”

Section: Morphology and Pore Structure Characterizationssupporting

confidence: 74%

The Potential of Activated Carbon Made of Agro-Industrial Residues in NOx Immissions Abatement

et al. 2017

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Abstract:The treatment of NO x from automotive gas exhaust has been widely studied, however the presence of low concentrations of NO x in confined areas is still under investigation. As an example, the concentration of NO 2 can approximate 0.15 ppmv inside vehicles when people are driving on highways. This interior pollution becomes an environmental problem and a health problem. In the present work, the abatement of NO 2 immission is studied at room temperature. Three activated carbons (ACs) prepared by physical (CO 2 or H 2 O) or chemical activation (H 3 PO 4 ) are tested as adsorbents. The novelty of this work consists in studying the adsorption of NO 2 at low concentrations that approach real life immission concentrations and is experimentally realizable. The ACs present different structural and textural properties as well as functional surface groups, which induce different affinities with NO 2 . The AC prepared using water vapor activation presents the best adsorption capacity, which may originate from a more basic surface. The presence of a mesoporosity may also influence the diffusion of NO 2 inside the carbon matrix. The high reduction activity of the AC prepared from H 3 PO 4 activation is explained by the important concentration of acidic groups on its surface.

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Section: Morphology and Pore Structure Characterizationssupporting

confidence: 74%

The Potential of Activated Carbon Made of Agro-Industrial Residues in NOx Immissions Abatement

et al. 2017

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“…The water vapor activated carbon has a higher total pore volume V TOT due to the presence of an important volume of mesopores (V meso = 0.30 cm 3 g −1 ). The presence of mesopores on water vapor-activated carbons due to a higher gasification of the carbon source of the precursor has been previously reported [43,47]. On the other hand, the chemically-activated carbon AC-H 3 PO 4 has significantly higher specific surface area (SSA) and micropore volume V µ than the physically-activated ones, in agreement with the literature [48].…”

Section: Samples Propertiessupporting

confidence: 88%

CO2 and CH4 Adsorption Behavior of Biomass-Based Activated Carbons

et al. 2018

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The aim of the present work is to study the effect of different activation methods for the production of a biomass-based activated carbon on the CO 2 and CH 4 adsorption. The influence of the activation method on the adsorption uptake was studied using three activated carbons obtained by different activation methods (H 3 PO 4 chemical activation and H 2 O and CO 2 physical activation) of olive stones. Methane and carbon dioxide pure gas adsorption experiments were carried out at two working temperatures (303.15 and 323.15 K). The influence of the activation method on the adsorption uptake was studied in terms of both textural properties and surface chemistry. For the three adsorbents, the CO 2 adsorption was more important than that of CH 4 . The chemically-activated carbon presented a higher specific surface area and micropore volume, which led to a higher adsorption capacity of both CO 2 and CH 4 . For methane adsorption, the presence of mesopores facilitated the diffusion of the gas molecules into the micropores. In the case of carbon dioxide adsorption, the presence of more oxygen groups on the water vapor-activated carbon enhanced its adsorption capacity.

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“…The obtained textural properties of the three activated carbons are summarized in Table 1.The obtained activated carbons are mainly microporous, with the AC-H 2 O having also an important mesoporous volume (V meso =0.30 cm 3 g −1 ). The presence of mesoporous volume on water vapor activated carbons due to a higher gasification of the carbon source of the precursor has been previously reported [26,27]. On the other hand, the chemical activated carbon AC-H 3 PO 4 has significantly higher BET surface area (S BET ) and micropore volume V µ that the physical activated ones in agreement with the literature [28].…”

Section: Samples Propertiessupporting

confidence: 81%

CO2 and CH4 Adsorption Behavior of Biomass Based Activated Carbons

Peredo-Mancilla¹,

Ghouma²,

Hort³

et al. 2018

Preprint

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Abstract:The aim of the present study is to provide new insights into the CO 2 and CH 4 adsorption using a set of biomass-based activated carbons obtained by physical and chemical activation of olive-stones. The adsorption behavior is analyzed by means of pure gas adsorption isotherms up to 3.2 MPa at two temperatures (303.15 and 323.15 K).The influence of the activation method on the adsorption uptake is studied in terms of both textural properties and surface chemistry. For three activated carbons the CO 2 adsorption was more important than that of CH 4 . The chemically activation resulted in higher BET surface area and micropore volume that lead to higher adsorption for both CO 2 and CH 4 . For methane the presence of mesopores seems to facilitate the access of the gas molecules into the micropores while for carbon dioxide, the presence of oxygen groups enhanced the adsorption capacity.

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Dependence of the Microporosity of Activated Carbons on the Lignocellulosic Composition of the Precursors

Cited by 21 publications

References 17 publications

The Potential of Activated Carbon Made of Agro-Industrial Residues in NOx Immissions Abatement

The Potential of Activated Carbon Made of Agro-Industrial Residues in NOx Immissions Abatement

CO2 and CH4 Adsorption Behavior of Biomass-Based Activated Carbons

CO2 and CH4 Adsorption Behavior of Biomass Based Activated Carbons

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