3D-hierarchical porous functionalized carbon aerogel from renewable cellulose: An innovative solid-amine adsorbent with high CO2 adsorption performance

An, Xuefei; Li, Tongxin; Chen, Jiaqi; Fu, Dong

doi:10.1016/j.energy.2023.127392

Cited by 18 publications

(4 citation statements)

References 56 publications

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“…The low renewable energy consumption can effectively reduce industrial costs, which is of great significance for the large-scale application of adsorbents in practical industries. The regeneration heat can be calculated using eq Q r = C normalp , normals ( T d e s − T a d s ) / q + normalΔ H r + f H 2 normalO Q v / q where C p,s (GJ/ton·K) represents the heat capacities measured by differential scanning calorimetry (DSC), and T des (K) and T ads (K) represent the desorption and adsorption temperatures, respectively. q (wt %) represents the adsorption capacity, Δ H r (GJ/ton) represents the desorption reaction heat, f H 2 O represents the mass fraction of water absorbed on the solid evaporated in the regenerator, and Q v (GJ/ton) represents the vaporization heat of water at atmospheric pressure.…”

Section: Resultsmentioning

confidence: 99%

Adsorption of CO₂ in Flue Gas by Polyethylenimine-Functionalized Adsorbents: Effects of the Support Morphology and Dispersion Mode of Amines

Li,

Fu,

Pan

2023

Energy Fuels

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In recent years, the use of polyethylenimine (PEI)-functionalized adsorbents for CO 2 capture from flue gas has gained significant attention due to its excellent adsorption capacity. However, the influences of suitable support materials and their morphology on the adsorption and desorption of CO 2 have not been adequately explored. In this study, we investigate the impact of three nanostructures of SiO 2 support, namely, silica nanospheres (SNPs), silica nanosheets (SNHs), and silica nanotubes (SNTs), on CO 2 capture from ultralow emission flue gas, with special emphasis on key parameters such as the adsorption capacity, amine efficiency, kinetics, thermodynamics, cyclic stability, and optimal adsorption temperature to elucidate the crucial role of morphology. Experimental results demonstrated that SNHs facilitate the dispersion of PEI on their surface, thereby effectively utilizing the specific surface area and enhancing the dispersion of the active sites of PEI. This amine dispersion method successfully reduces the mass transfer resistance of CO 2 during the adsorption process. Conversely, SNTs lead to PEI dispersion between support particles, resulting in increased diffusion resistance toward CO 2 and consequently decreased adsorbent performance. For SNPs, the loading of PEI into the pores effectively prevented the degradation of the adsorption performance caused by PEI leaching during the cyclic use of the adsorbent. In addition, the larger pore volume of SNPs facilitated the loading of a greater number of PEI molecules. Notably, at 60 wt % PEI loading, SNPs exhibited a higher adsorption capacity (3.68 mmol/g), lower adsorption heat (51.91 kJ/mol), and reduced regeneration energy consumption (1.775 GJ/ton). This study sheds light on the role of the support morphology in adsorption processes and presents a novel strategy for designing solid amine adsorbents with favorable cycle stability, high CO 2 capture performance, and efficient amine utilization.

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Section: Resultsmentioning

confidence: 99%

Adsorption of CO₂ in Flue Gas by Polyethylenimine-Functionalized Adsorbents: Effects of the Support Morphology and Dispersion Mode of Amines

Li,

Fu,

Pan

2023

Energy Fuels

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“…Excessive fossil fuel consumption has generated massive CO 2 emissions that exceed the natural carbon cycle, causing harsh environmental consequences such as disappearing glaciers, rising sea levels, and increasing droughts and bushfires. − To reduce CO 2 emissions, mitigation technologies must be developed and implemented, with carbon capture, utilization, and storage technologies being regarded as an important strategy . Among the different CO 2 capture technologies, including amine washing, membrane separation, and ionic liquid (IL) absorption, solid-state physisorption is considered one of the most promising because of its operational simplicity and high efficiency. The key to the solid-state physisorption method is the development of high-performance solid adsorbents with excellent CO 2 adsorption capacity, CO 2 /N 2 selectivity, and fast adsorption/desorption kinetics .…”

Section: Introductionmentioning

confidence: 99%

Hierarchically Porous Mg-MOF-74/Sodium Alginate Composite Aerogel for CO₂ Capture

Peng,

Zhang,

Sun

et al. 2023

ACS Appl. Nano Mater.

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One of the most promising methods for capturing carbon dioxide (CO2) is solid physical adsorption, which is an efficient and simple technique. The key to effective CO2 capture is the development of high-performance solid adsorbents with excellent CO2 adsorption capacity, CO2/N2 selectivity, and rapid adsorption/desorption kinetics. In this paper, a Mg-MOF-74/sodium alginate composite aerogel was prepared by loading Mg-MOF-74 on sodium alginate sheets followed by directional freeze-drying. The composite aerogel exhibited a hierarchical porous structure, in which sodium alginate provided an open mesoporous/macroporous structure that promoted diffusion and contact with the active center of CO2. The Mg-MOF-74 micropores/mesopores promoted the strong interaction between CO2 and the adsorbent in the micropore and rapid mass transfer of CO2 to the adsorbent through the mesopores. The experimental data showed that MSA-6 achieved CO2 adsorption of 2.461 mmol·g–1 at 298 K. Furthermore, the CO2/N2 adsorption selectivity of MSA-6 reached 35.108, indicating its strong CO2 selective adsorption potential.

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“…Nevertheless, the disadvantages related to an intensive energy requirement for solvent regeneration, equipment corrosion issues and the poor cyclic stability of sorbents due to amine degradation render this process less desirable. [11][12][13] To date, extensive research have pivoted toward CO 2 adsorptive separation using porous solid substrates such as zeolites, [14][15][16] silicas, [17][18][19] carbonaceous materials, [20][21][22] metal oxides, [23][24][25] and metal-organic frameworks (MOF). [26][27][28] This approach carries benefits like simplicity, cost-effectiveness and energy efficiency with high stability throughout looping processes, making it a promising alternative for CO 2 capture separation.…”

Section: Introductionmentioning

confidence: 99%

Utilizing Gelatin Waste for Efficient Bimodal Porous Silica Adsorbents for Carbon Dioxide Capture

Numpilai,

Witoon

2023

ChemPlusChem

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This study explores the modification of pore structures in porous silica materials synthesized using sodium silicate and waste gelatin, under varying silica‐to‐gelatin ratios. At ratios of 1.0–1.5, bimodal porous silica with mesopores and macropores emerged due to spaces between silica nanoparticles and clusters, following gelatin elimination. The study further evaluated the obtained bimodal porous silica as polyethyleneimine (PEI) supports for CO2 capture, alongside PEI‐loaded unimodal porous silica and hollow silica sphere for comparison. Notably, the PEI‐loaded bimodal silica showcased superior CO2 uptake, achieving 145.6 mg g−1 at 90 °C. Transmission electron microscopy (TEM) revealed PEI′s uniform distribution within the pores of bimodal silica, unlike the excessive surface layering seen in unimodal silica. Conversely, PEI completely filled the hollow porous silica‘s interior, extending gas molecule diffusion distance. All sorbents displayed nearly constant CO2 adsorption across 20 cycles, demonstrating outstanding stability. Notably, the bimodal porous silica displayed a negligible capacity loss, underscoring its robust performance.

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3D-hierarchical porous functionalized carbon aerogel from renewable cellulose: An innovative solid-amine adsorbent with high CO2 adsorption performance

Cited by 18 publications

References 56 publications

Adsorption of CO₂ in Flue Gas by Polyethylenimine-Functionalized Adsorbents: Effects of the Support Morphology and Dispersion Mode of Amines

Adsorption of CO₂ in Flue Gas by Polyethylenimine-Functionalized Adsorbents: Effects of the Support Morphology and Dispersion Mode of Amines

Hierarchically Porous Mg-MOF-74/Sodium Alginate Composite Aerogel for CO₂ Capture

Utilizing Gelatin Waste for Efficient Bimodal Porous Silica Adsorbents for Carbon Dioxide Capture

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3D-hierarchical porous functionalized carbon aerogel from renewable cellulose: An innovative solid-amine adsorbent with high CO2 adsorption performance

Cited by 18 publications

References 56 publications

Adsorption of CO2 in Flue Gas by Polyethylenimine-Functionalized Adsorbents: Effects of the Support Morphology and Dispersion Mode of Amines

Adsorption of CO2 in Flue Gas by Polyethylenimine-Functionalized Adsorbents: Effects of the Support Morphology and Dispersion Mode of Amines

Hierarchically Porous Mg-MOF-74/Sodium Alginate Composite Aerogel for CO2 Capture

Utilizing Gelatin Waste for Efficient Bimodal Porous Silica Adsorbents for Carbon Dioxide Capture

Contact Info

Product

Resources

About

Adsorption of CO₂ in Flue Gas by Polyethylenimine-Functionalized Adsorbents: Effects of the Support Morphology and Dispersion Mode of Amines

Adsorption of CO₂ in Flue Gas by Polyethylenimine-Functionalized Adsorbents: Effects of the Support Morphology and Dispersion Mode of Amines

Hierarchically Porous Mg-MOF-74/Sodium Alginate Composite Aerogel for CO₂ Capture