Improving low-pressure CO2 capture performance of N-doped active carbons by adjusting flow rate of protective gas during alkali activation

Li, Dawei; Jiaojiao, Zhou; Zhang, Zongbo; Li, Liangjun; Tian, Yuanyu; Lu, Yiming; Qiao, Yu; Li, Junhua; Wen, Liping

doi:10.1016/j.carbon.2016.12.039

Cited by 80 publications

(39 citation statements)

References 45 publications

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“…The Vultra values listed in Table 1 were particularly high for all the ACs (0.103-0.148 cm 3 g -1 ) and the BC-CO2-0.1-800 sample (0.096 cm 3 g -1 ). In some previous studies, similar or slightly lower ultra-micropore volumes (also estimated using DFT or NLDFT methods) were reported by Hao et al [8] (0.072-0.128 cm 3 g -1 , for several biowaste-derived hydrochars physically activated with CO2 at 800 °C), Li et al [14] (0.08-0.15 cm 3 g -1 , for rice husk-derived chars chemically activated with KOH at 640-780 °C), and Li et al [32] (0.079-0.115 cm 3 g -1 , for chitosan-derived chars chemically activated with KOH at 600 °C). It should be pointed out that other previously reported ultramicropore volumes, which were estimated using alternative methods, such as the Horvath-Kawazoe approach (used by Ren et al [33]) or the procedure based on the Dubinin−Radushkevich equation (used by Yang et al [9], and Chen et al [17]), are not directly comparable, since the appropriateness of these estimation techniques was questioned [34].…”

Section: Ultra-micropore Volumementioning

confidence: 83%

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

165

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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: Ultra-micropore Volumementioning

confidence: 83%

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

165

View full text Add to dashboard Cite

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“…N‐doped porous carbons have attracted great interest due to their improved performance as electrodes in electrochemical storage, compared to their un‐doped analogous . However, the synthesis of N‐doped carbons usually requires long steps, which involve high carbonization temperature and further post‐treatment to introduce N. They can also be obtained from direct pyrolysis of N‐enriched metal‐organic frameworks (MOFs), and polymers such as the polypyrrole, polydopamine or polyacrylonitrile . However, organic precursors are less available than biomass .…”

Section: Introductionmentioning

confidence: 99%

High Performance N‐Doped Carbon Electrodes Obtained via Hydrothermal Carbonization of Macroalgae for Supercapacitor Applications

et al. 2018

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The conversion of bio‐waste into useful porous carbons constitutes a very attractive approach to contribute to the development of sustainable energy economy, even more as they can be used in energy storage devices. Here we report the synthesis of N‐doped carbons from hydrothermal carbonization of macroalgae, Enteromorpha prolifera (EP), followed by a mild KOH activation step. The obtained N‐doped carbons exhibited surface areas of up to ∼2000 m2/g with N‐loadings varied in the range of 1.4∼2.9 at %. By modifying activation temperature, we were able to tune the surface chemistry and porosity, achieving excellent control of their properties. The specific capacitance reached values of up to 200 F/g at 1 A/g in 6 M KOH for the sample obtained at activation temperature of 700 °C (AHC‐700). The symmetric supercapacitor using the sample activated at 800 °C (AHC‐800) as electrodes exhibited the highest cycling stability of the samples studied in this work, with capacitance retention of up to 96 % at 10 A/g, even after 10,000 cycles, constituting the highest reported for biomass‐derived carbon electrodes. These results show the great potential of N‐doped carbons as electrodes for supercapacitors and confirm the excellent electrochemical properties of biomass‐derived carbons in energy storage technologies.

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“…The CO 2 /N 2 selectivity of FPDC‐0.5‐600 measured at 25 °C is shown in Figure b. The selectivity of all samples measured at 25 and 0 °C, calculated based on IAST theory, is presented in Table . The FPDC samples show CO 2 /N 2 selectivity in the range of 23 to 47 and 28 to 42 at 0 and 25 °C, respectively.…”

Section: Resultsmentioning

confidence: 99%

Waste‐Fish‐Derived Nitrogen Self‐Doped Microporous Carbon as Effective Sorbent for CO₂ Capture

2018

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Protein‐rich waste fish was used to produce nitrogen self‐doped microporous carbon by KOH activation and studied for CO2 adsorption application. The effect of a pre‐carbonization process of dried fish powder on the textural properties and yield of fish protein derived carbon (FPDC) was also investigated. The textural properties of FPDC‐x–y were further optimized by varying KOH to Fish powder weight ratios (x) and activation temperatures (y). Activated carbons with high specific surface area and pore volume were obtained using mild activation conditions (x= 0.5 to 1.5, y= 550 to 650 °C). The nitrogen content (3.79 to 12.43 wt%) and carbon yield (2.3 to15 wt%) depended strongly on the KOH to Fish powder weight ratio and activation temperature. Highest surface area (2565 m2 g−1) and total pore volume (1.32 cm3 g−1) were exhibited by FPDC‐1‐650 whereas FPDC‐1‐550 exhibited the highest micropore volume (0.33 cm3 g−1). The synergistic effect of microporosity and nitrogen functionality had a positive influence on CO2 uptake in the FPDC. The FPDC‐0.5‐600 shows a maximum CO2 adsorption capacity of 4.03 and 6.07 mmol g−1 at 25 and 0 oC, respectively, at 1 bar. CO2 adsorption on FPDC‐x–y shows excellent recyclability and CO2/N2 selectivity in the range of 23 to 47 at 0 oC.

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Improving low-pressure CO2 capture performance of N-doped active carbons by adjusting flow rate of protective gas during alkali activation

Cited by 80 publications

References 45 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

High Performance N‐Doped Carbon Electrodes Obtained via Hydrothermal Carbonization of Macroalgae for Supercapacitor Applications

Waste‐Fish‐Derived Nitrogen Self‐Doped Microporous Carbon as Effective Sorbent for CO₂ Capture

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Improving low-pressure CO2 capture performance of N-doped active carbons by adjusting flow rate of protective gas during alkali activation

Cited by 80 publications

References 45 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

High Performance N‐Doped Carbon Electrodes Obtained via Hydrothermal Carbonization of Macroalgae for Supercapacitor Applications

Waste‐Fish‐Derived Nitrogen Self‐Doped Microporous Carbon as Effective Sorbent for CO2 Capture

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Waste‐Fish‐Derived Nitrogen Self‐Doped Microporous Carbon as Effective Sorbent for CO₂ Capture