Development of a cost-effective CO2 adsorbent from petroleum coke via KOH activation

Jang, Eunji; Choi, Seung Wan; Hong, Seok Min; Shin, Sangcheol; Lee, Ki Bong

doi:10.1016/j.apsusc.2017.08.075

Cited by 117 publications

(44 citation statements)

References 50 publications

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“…kJ mol -1 at low uptake of CO2. These values are similar or slightly lower than those reported in previous studies for porous carbons [1,8,17,18,33,35,37,38,46]. For physically ACs as well as the adsorbent produced by a single-step method (BC-CO2-0.1-800), the isosteric heats decreased with an increase in surface coverage.…”

Section: Heat Of Adsorptionsupporting

confidence: 85%

Ultra-microporous adsorbents prepared from vine shoots-derived biochar with high CO2 uptake and CO2/N2 selectivity

Manyà

González

Azuara

et al. 2018

Chemical Engineering Journal

167

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There is a growing interest in developing renewable biomass-based adsorbents to be used in numerous applications, including CO2 capture in postcombustion conditions. In the present study, several activated carbons (ACs) were produced from vine shoots-derived biochar through both physical and chemical activation using CO2 and KOH, respectively. The performance of these ACs was tested in terms of CO2 uptake capacity at an absolute pressure of 15 kPa and at different temperatures (0, 25, and 75 °C), apparent selectivity towards CO2 over N2, and isosteric heat of adsorption. At 25 °C, the chemically ACs with KOH impregnation exhibited the highest CO2 adsorption capacity, which was similar or even higher than those recently reported for a number of carbon-based adsorbents. However, the AC prepared through physical activation with CO2 at 800 °C and a soaking time of 1 h appears as the most promising adsorbent analyzed here, due to its higher CO2 uptake capacity and adsorption rate at relatively high temperature (75 °C), its relatively high selectivity at this temperature, and its apparently low energy demand for regeneration. Given that physical activation with CO2 is more feasible at industrial scale than chemical activation using corrosive alkalis, the results reported here are encouraging for further development of vine shootsderived adsorbents.

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Section: Heat Of Adsorptionsupporting

confidence: 85%

Ultra-microporous adsorbents prepared from vine shoots-derived biochar with high CO2 uptake and CO2/N2 selectivity

Manyà

González

Azuara

et al. 2018

Chemical Engineering Journal

167

View full text Add to dashboard Cite

show abstract

“…Table 6 shows the CO 2 adsorption capacities of activated carbons prepared in this work, the range of this parameter is from 205 to 333 mg g −1 , these data are satisfactory, considering the fact that in other studies the adsorbed amounts have been between 43 and 400 mg g −1 in adsorbent materials such as: zeolites, carbon fibers, MOF and activated carbon (Plaza et al, 2010 , Carruthers et al, 2012 ; Cho et al, 2012 ; Sevilla and Fuertes, 2012 ; Wahby et al, 2012 ; Yang et al, 2012 ; An et al, 2013 ; Liu et al, 2013 ; Jang et al, 2018 ; Querejeta et al, 2018 ). Taking into account the CO 2 adsorption capacities of the prepared activated carbon, it can be affirmed that the modifications made with HNO 3 and NH 4 OH were effective since they generated an increase of up to 61.56% in the adsorbed amount of this gas on the carbonaceous materials, This increase is associated with the incorporation of nitrogen groups that act as electron donors and carboxylic groups that are capable of establishing Lewis acid-base interactions with the CO 2 molecule, because these groups not only have a carbonyl group that can act as a Lewis base toward the carbon atom (Lewis acid) of the molecule, but also has an acidic proton that can act as a Lewis acid toward the oxygen atom (Lewis bases) of the CO 2 molecule (Bell et al, 2003 ).…”

Section: Resultsmentioning

confidence: 96%

Study of CO2 Adsorption on Chemically Modified Activated Carbon With Nitric Acid and Ammonium Aqueous

2020

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The study of CO 2 adsorption on adsorbent materials is a current topic of research interest. Although in real operating circumstances, the removal conditions of this gas is carried out at temperatures between 290 and 303 K and 1 Bar of pressure or high pressures, it is useful, as a preliminary approach, to determine CO 2 adsorption capacity at 273K and 1 Bar and perform a thermodynamic study of the CO 2 adsorption heats on carbonaceous materials prepared by chemical activation from African palm shell with CaCl 2 and H 3 PO 4 solutions, later modified with HNO 3 and NH 4 OH, with the aim to establish the influence that these treatments have on the textural and chemical properties of the activated carbons and their relationship with the CO 2 adsorption capacity. The carbonaceous materials were characterized by physical adsorption of N 2 at 77K, CO 2 at 273K, proximate analysis, Boehm titrations and immersion calorimetry in water and benzene. Activated carbons had a BET area between 634 and 865 m 2 g −1 , with a micropore volume between 0.25 and 0.34 cm 3 g −1 . The experimental results indicated that the modification of activated carbon with HNO 3 and NH 4 OH generated a decrease in the surface area and pore volume of the material, as well as an increase in surface groups that favored the adsorption of CO 2 , which was evidenced by an increase in the adsorption capacity and the heat of adsorption.

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“…The bubbles are the breaking process of the bond between H2 and O2 in water compound so that H2 and O2 more and more. Also Eunji Jang, et al (2017) said that KOH is very good to absorb CO2. H.H.…”

Section: Potassium Hydroxide (Koh)mentioning

confidence: 99%

Experimental Investigation on Dry Cell Hho Generator With Catalyst Variation for Reducing the Emissions

Basori

2018

JoMEVE

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<p>Air pollution is now largely attributable to the use of vehicles that produce high pollution. The purpose of this study is to determine the contribution of HHO generator in reducing air pollution by looking at the emission level of exhaust gas. In addition, to know the type of catalyst is the best in lowering the level of these pollutants.<br />The research using an experimental method. The subject is Honda Supra X 125 the Year 2013 by adding a dry cell HHO generator. Emissions data collection using gas analyzer against the use of HHO generator with catalyst variation (KOH, NaOH, and NAHCO3). Data analysis was done by descriptive quantitative.<br />The results showed (1) All types of catalysts studied (KOH, NaOH, and NAHCO3) as electrolyte solution media for HHO generators which greatly affected the reduction of CO and HC emissions in vehicles, (2) Catalyst NaOH type is the most effective catalyst in reducing CO and HC emissions. This is evidenced by the results of NaOH solution to obtain average CO gas concentration is 0.13% or a decrease of 81.74% and the use of NaOH solution to get an average concentration of HC gas is 524.33 ppm or a decrease of 69.62% when compared to standard conditions (without HHO generator).</p>

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Development of a cost-effective CO2 adsorbent from petroleum coke via KOH activation

Cited by 117 publications

References 50 publications

Ultra-microporous adsorbents prepared from vine shoots-derived biochar with high CO2 uptake and CO2/N2 selectivity

Ultra-microporous adsorbents prepared from vine shoots-derived biochar with high CO2 uptake and CO2/N2 selectivity

Study of CO2 Adsorption on Chemically Modified Activated Carbon With Nitric Acid and Ammonium Aqueous

Experimental Investigation on Dry Cell Hho Generator With Catalyst Variation for Reducing the Emissions

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