Alkali metal (Na, Cs and K) promoted hydrotalcites for high temperature CO2 capture from flue gas in cyclic adsorption processes

Faria, A. Catarina; Trujillano, Raquel; Rives, V.; Miguel, Carlos V.; Rodrigues, Alírio E.; Madeira, Luís M.

doi:10.1016/j.cej.2021.131502

Cited by 30 publications

(11 citation statements)

References 31 publications

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“…The practical pressure of CO 2 in flue gas streams is around 0.15 bar, and the CO 2 uptake at 0.15 bar reveals the potential to work as a CO 2 adsorbent for the flue gas in practical applications. , HPC-7-2 and HPC-8-2 exhibit comparable CO 2 uptakes at 0.15 bar under both 273 and 298 K (Table S2), which further confirms the dominant role of narrow micropores in capturing CO 2 . Furthermore, NHPC-1.5 and NHPC-2.0 exhibit a prominent CO 2 capture amount at 0.15 bar (Table S2), which should benefit from the synergistic effect of superior ultramicroporosity and high surface N-doping content, bringing more basic adsorption sites with strong interaction.…”

Section: Resultsmentioning

confidence: 59%

Hierarchically Nanoporous Carbon for CO₂ Capture and Separation: Roles of Morphology, Porosity, and Surface Chemistry

Shi

Liu

et al. 2023

ACS Appl. Nano Mater.

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Nanoporous carbons, as promising adsorbents for CO 2 capture and separation from flue gas, span the major challenge of optimizing the physicochemical property to meet the need of CO 2 capture and separation. Herein, we rationally engineered sustainable nanoporous carbons with tailorable porosity and rich surface chemistry using an activating agent of small-molecule organic acids. The porosity could be easily tailored by varying the activation temperature and activator dosage. The surface chemistry and morphology could be tuned by changing the dopant concentration. In detail, porosity played a determinant role in CO 2 adsorption capacity, especially ultramicroporosity. Narrow micropores brought major contributions to CO 2 uptake at low pressure, while mesopores played a great role at high adsorption pressure. Surface chemistry played a critical role in CO 2 capture, especially adsorption selectivity and the isosteric heat of adsorption when the ultramicroporosity was optimal. We revealed that the C−OH group (one type of oxygen-containing species) made a relatively high contribution for improving CO 2 capture by hydrogen bonding. For nitrogen-containing groups, the pyridinic-N, pyrrolic-N, and amine groups provoked more improvements in CO 2 capture by offering more basic CO 2 -philic sites, while the oxidized-N group made a weak influence. Sheet-like structures exhibited more accessible affine sites for fast CO 2 capture and separation. We proposed a valuable reference for rationally engineering nanoporous carbons with the optimal texture to meet the different requirements of CO 2 capture. More importantly, the conversion of biowaste into high-added-value adsorbents for effective CO 2 capture and separation opened up an elegant route of killing two birds with one stone.

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Section: Resultsmentioning

confidence: 59%

Hierarchically Nanoporous Carbon for CO₂ Capture and Separation: Roles of Morphology, Porosity, and Surface Chemistry

Shi

Liu

et al. 2023

ACS Appl. Nano Mater.

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“…So far, several porous solids have been evaluated regarding their efficiency as adsorbents for the selective capture of CO 2 . Examples include metal-organic frameworks (Vaghasia et al 2022;Lin et al 2022), hydrotalcite (Faria et al 2022), zeolites (Shen et al 2022;Gonzalez-Olmos et al 2022), metal oxides (Papalas et al 2021;Gao et al 2021;Mutch et al 2018;Long et al 2022;Bahadoran et al 2022a) and porous carbon (Singh et al 2019;Zhang et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Mesoporous carbon nitride supported MgO for enhanced CO2 capture

Refaat

Sadgal

Naga

et al. 2023

Environ Sci Pollut Res

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The growing concern about the environmental consequences of anthropogenic CO2 emissions significantly stimulated the research of low-cost, efficient, and recyclable solid adsorbents for CO2 capture. In this work, a series of MgO-supported mesoporous carbon nitride adsorbents with different MgO contents (xMgO/MCN) was prepared using a facile process. The obtained materials were tested for CO2 capture from 10 vol% CO2 mixture gas with N2 using a fixed bed adsorber at atmospheric pressure. At 25 ºC, the bare MCN support and unsupported MgO samples demonstrated CO2 capture capacities of 0.99, and 0.74 mmol g−1, respectively, which were lower than those of the xMgO/MCN composites.The incorporation of MgO into the MCN improved the CO2 uptake, and the 20MgO/MCN exhibited the highest CO2 capture capacity of 1.15 mmol g−1 at 25 °C. The improved performance of the 20MgO/MCN nanohybrid can be possibly assigned to the presence of high content of highly dispersed MgO NPs along with its improved textural properties in terms of high specific surface area (215 m2g−1), large pore volume (0.22 cm3g−1), and abundant mesoporous structure. The efffects of temperature and CO2 flow rate were also investigated on the CO2 capture performance of 20MgO/MCN. Temperature was found to have a negative influence on the CO2 capture capacity of the 20MgO/MCN, which decreased from 1.15 to 0.65 mmol g−1with temperature rise from 25 C to 150º C, due to the endothermicity of the process. Similarly, the capture capacity decreased from 1.15 to 0.54 mmol g−1 with the increase of the flow rate from 50 to 200 ml minute−1 respectively. Importantly, 20MgO/MCN showed excellent reusability with consistent CO2 capture capacity over five sequential sorption–desorption cycles, suggesting its suitability for the practical capture of CO2.

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“…They can be used as catalysts, catalyst precursors, composite fillers, or pollutant absorbers/adsorbents in water [ 18 , 19 ], for controlled drug release, as ceramic pigment precursors, as adsorbents, and as ion exchangers [ 13 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Original and Calcined Layered Double Hydroxide as Low-Cost Adsorbents: The Role of the Trivalent Cation on Methylene Blue Adsorption

et al. 2023

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Layered double hydroxides with the hydrotalcite-like structure, containing Mg2+, Al3+, and Fe3+ (with different Al/Fe ratios) in the layers, have been synthesized and fully characterized, as have the mixed oxides formed upon their calcination at 500 °C. Both series of solids (original and calcined ones) have been tested for methylene blue adsorption. In the case of the Fe-containing sample, oxidation of methylene blue takes place simultaneously with adsorption. For the calcined samples, their reconstruction to the hydrotalcite-like structure plays an important role in their adsorption ability.

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Alkali metal (Na, Cs and K) promoted hydrotalcites for high temperature CO2 capture from flue gas in cyclic adsorption processes

Cited by 30 publications

References 31 publications

Hierarchically Nanoporous Carbon for CO₂ Capture and Separation: Roles of Morphology, Porosity, and Surface Chemistry

Hierarchically Nanoporous Carbon for CO₂ Capture and Separation: Roles of Morphology, Porosity, and Surface Chemistry

Mesoporous carbon nitride supported MgO for enhanced CO2 capture

Preparation of Original and Calcined Layered Double Hydroxide as Low-Cost Adsorbents: The Role of the Trivalent Cation on Methylene Blue Adsorption

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Alkali metal (Na, Cs and K) promoted hydrotalcites for high temperature CO2 capture from flue gas in cyclic adsorption processes

Cited by 30 publications

References 31 publications

Hierarchically Nanoporous Carbon for CO2 Capture and Separation: Roles of Morphology, Porosity, and Surface Chemistry

Hierarchically Nanoporous Carbon for CO2 Capture and Separation: Roles of Morphology, Porosity, and Surface Chemistry

Mesoporous carbon nitride supported MgO for enhanced CO2 capture

Preparation of Original and Calcined Layered Double Hydroxide as Low-Cost Adsorbents: The Role of the Trivalent Cation on Methylene Blue Adsorption

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Hierarchically Nanoporous Carbon for CO₂ Capture and Separation: Roles of Morphology, Porosity, and Surface Chemistry

Hierarchically Nanoporous Carbon for CO₂ Capture and Separation: Roles of Morphology, Porosity, and Surface Chemistry