CO2 Capture Properties Research Articles

Enhanced CO2 capture over Li-containing β-NaFeO2 materials: Effect of lithium nitrate addition

Herein, we present a feasible methodology for the improvement of the CO2 capture properties of sodium-ferrite-based materials through the addition of lithium nitrate. Initially, the pristine material (β-NaFeO2) was synthetized through the nitrate pyrolysis method and then it was mechanically mixed with different amounts of LiNO3 (2.5, 5, 10, 15 and 25 mol% of lithium). Materials were structural and microstructurally characterized and the CO2 capture properties were evaluated through TGA analyses, using two different approaches; dynamic and isothermal tests. Result show that the best CO2 capture performance is achieved in the sample containing 5 mol% of lithium nitrate, identified as 5Li-NaFeO2. The CO2 capture enhancement resulted from the formation of a LiNO3-Na2CO3 eutectic phase, acting as a liquid carrier and promoting the surface and bulk carbonation of the sodium ferrite particles. In fact, the 5Li-NaFeO2 dioxide capture enhancement was reflected by increasing the amount of CO2 captured as well as by reducing the temperature range of capture, compared to the pristine β-NaFeO2 material.

Highly Efficient I2 Sorption, CO2 Capture, and Catalytic Conversion by Introducing Nitrogen Donor Sites in a Microporous Co(II)-Based Metal-Organic Framework.

Recently, the development of porous absorbents for efficient CO2 and I2 capture has attracted considerable attention because of severe global climate change and environmental issues with the nuclear energy. Hence, a unique porous metal-organic framework (MOF), {[Co(L)]·DMF·2H2O}n (1, DMF = N,N-dimethylformamide) with uncoordinated N atoms was rationally constructed via using a heterofunctional 4,6-bis(4'-carboxyphenyl)pyrimidine (H2L) linker. Interestingly, 1 exhibits exceptional properties for I2 sorption, CO2 capture, and catalytic conversion. Particularly, I2 can be efficiently removed in both vapor and solution forms, and the adsorption amount can reach 676.25 and 345.28 mg g-1, respectively. Furthermore, complex 1 displays high adsorption capacity for CO2 (53.78 cm3 g-1, 273 K). Consequently, 1 is expected to be a promising and practical material for environmental purification due to its excellent adsorption properties.

Nitrogen-doped porous carbons from polyacrylonitrile fiber as effective CO2 adsorbents

In this report, nitrogen-doped porous carbons were synthesized from polyacrylonitrile fiber by a facile two-step synthesis process i.e. carbonization followed by KOH activation. Activation temperature and KOH/carbon ratio are two parameters to tune the porosity and surface chemical properties of sorbents. The as-obtained sorbents were carefully characterized. Special attention was paid concerning the change of sorbents’ morphology with respect to synthesis conditions. Under the activation temperatures of this study, the sorbents can still retain their fibrous structure when the KOH/carbon mass ratio is 1. Further increasing the KOH amount will destroy the original morphology of polyacrylonitrile fiber. CO2 adsorption performance tests show that a sorbent retaining the fibrous shape possesses the highest CO2 uptake of 3.95 mmol/g at 25°C and 1 bar. Comprehensive investigation found that the mutual effect of narrow microporosity and doped N content govern the CO2 adsorption capacity of these adsorbents. Furthermore, these polyacrylonitrile fiber-derived carbons present multiple outstanding CO2 capture properties such as excellent recyclability, high CO2/N2 selectivity, fast adsorption kinetics, suitable heat of adsorption, and good dynamic adsorption capacity. Hence, nitrogen-doped porous carbons with fibrous structure are promising in CO2 capture.

Synthesis and characterization of advanced bio-carbon materials from Kraft lignin with enhanced CO2 capture properties

Biomass-derived porous carbons have received enormous attention for CO2 capture in post-combustion scenarios owing to their wide availability, excellent physicochemical stability, and cost-effective preparation. Here, a series of advanced bio-carbon materials were successfully prepared by using the underutilized industrial by-product Kraft lignin as precursor via a facile chemical activation process. Both the textural and surface properties of the bio-carbons were found to be highly tailorable by tuning the activation temperature, KOH/lignin ratio and pre-oxidation treatment. It was found that the Kraft lignin-derived carbons were exceedingly ultra-microporous with ultra-microporosity accounting for up to 92% of total micropores, while the carbons prepared with pre-oxidation treatment were uniquely characterised by distinctive hierarchical micro-mesoporous structures. Applying the Kraft lignin-derived carbons for CO2 adsorption demonstrates that at a CO2 partial pressure of 15 kPa, rarely obtainable CO2 adsorption capacities of 3.29 mmol/g at 0 °C and 2.01 mmol/g at 25 °C were achieved for the carbon prepared at 600 °C. Advanced characterizations confirm that the unique desirable combination of textural properties and surface chemistry, which favours the intercalation of potassium in the form of surface extra-framework K+ ions, underpinned the extraordinary CO2 adsorption performance and high CO2/N2 selectivity (up to 38) of the prepared carbons especially at low CO2 partial pressures. The results indicate that the unique three-dimensional aromatic structures of the lignin provide the matrix for the liable development of the well-defined ultra-microporosity at high levels. Our work provided a promising strategy for valorization of Kraft lignin as a precursor for producing advanced carbon materials.

Influence of additives on CaCO3 precursors and multicycle CO2 capture performance of CaO sorbents

Calcium looping based on alternation between uptake and release of CO2 is a promising technology for high-temperature CO2 capture. In this study, CaO sorbents were obtained from different precipitated CaCO3 precursors. Two additives, cetyltrimethyl ammonium bromide (CTAB) and triblock copolymer (P123), were used to modify CaCO3 precursors. Physical properties (morphology, crystal structure and porosity) of CaCO3 precursors, as well as CO2 capture performance of CaO sorbents were investigated. It was found that the presence of different concentration of additive would affect crystal composition and porosity of CaCO3 precursor. Experimental data showed that CaO sorbents derived from CaCO3 modified with 8 mmol/L CTAB exhibited higher CO2 capture capacity than other CaO sorbents after multiple cycles. Furthermore, the relationship between CO2 capture performance and properties of CaCO3 precursors was established. BET surface area and pore volume of CaCO3 precursors were positive correlated to average carbonation conversion. For CTAB cases, molar ratio of vaterite to calcite was negatively correlated to average carbonation conversion; and for P123 cases, molar ratio of vaterite to calcite was positively correlated to average conversion.

Organic pollutant collection and electrochemical CO2 reduction promoted by pH-Responsive surfactants

PH-responsive surfactants with controllable self-assembly properties are expected to become recyclable sources for collecting organic pollutants and capturing CO2 in aqueous solutions. In this work, F9-N2-mor exhibits remarkable pollutant-collection and CO2-capture properties, which are confirmed by the saturation concentrations of Mes-Acr-Me+ and pyrene dyes increasing 78.7-fold and 54.1-fold, respectively, and the electrochemical CO2 reduction current being enhanced 3.22-fold. The promoted pollutant collection and electrochemical CO2 reduction in these pH-responsive surfactants are outstanding compared to the commercial surfactants SDS and SDBS. More interestingly, these pH-responsive surfactants defoam at pH values below 4, and are easily recycled. Overall, pH-responsive surfactants provide a new inspiration for pollutant collection, oil removal and CO2 conversion.

Synergistic effect of charge and strain engineering on porous g-C9N7 nanosheets for highly controllable CO2 capture and separation

Efficient CO2 capture and separation, such as from natural gas, biogas, and landfill gas, is highly desirable to maximize the use of energy and alleviate carbon emission and greenhouse effect. A novel approach of charge/strain-regulated gas capture and separation has been proposed to offer the advantages of reversibility and controllable kinetics. We demonstrated the highly controllable CO2 capture and separation from CO2/CH4 on porous g-C9N7 nanosheets with varying charge densities and strains using molecular dynamics (MD) simulations and first-principle density function theory (DFT) calculations. The remarkable CO2 permeance up to 5.94 × 107 GPU can be achieved by charge engineering, such as through the strategies of electrochemical methods. A tunable CO2 separation performance was exhibited under the condition of tensile strain. The permeance of CO2 was found to increase with increasing the applied tensile strain, and the maximum permeance was 3.61 × 107 GPU with 7.5% strained g-C9N7 membrane. More interestingly, a promising approach for combining a charged state with the strain engineering was explored to investigate the synergistic effect. Under conditions of 1 e- negative charge and 3% tensile strain on g-C9N7 membrane, the CO2 permeance reached 3.18 × 107 GPU, which was 9 times higher than only with adding 1 e-, and 8 times higher than only applying 3% strain. Additionally, the temperature effect indicated that the g-C9N7 membrane can be served as an excellent candidate for CO2/CH4 separation at ambient conditions. These results provide useful guidance for developing advanced materials with highly controllable CO2 capture and separation properties.

Applications of Synthetic Biotechnology on Carbon Neutrality Research: A Review on Electrically Driven Microbial and Enzyme Engineering.

With the advancement of science, technology, and productivity, the rapid development of industrial production, transportation, and the exploitation of fossil fuels has gradually led to the accumulation of greenhouse gases and deterioration of global warming. Carbon neutrality is a balance between absorption and emissions achieved by minimizing carbon dioxide (CO2) emissions from human social productive activity through a series of initiatives, including energy substitution and energy efficiency improvement. Then CO2 was offset through forest carbon sequestration and captured at last. Therefore, efficiently reducing CO2 emissions and enhancing CO2 capture are a matter of great urgency. Because many species have the natural CO2 capture properties, more and more scientists focus their attention on developing the biological carbon sequestration technique and further combine with synthetic biotechnology and electricity. In this article, the advances of the synthetic biotechnology method for the most promising organisms were reviewed, such as cyanobacteria, Escherichia coli, and yeast, in which the metabolic pathways were reconstructed to enhance the efficiency of CO2 capture and product synthesis. Furthermore, the electrically driven microbial and enzyme engineering processes are also summarized, in which the critical role and principle of electricity in the process of CO2 capture are canvassed. This review provides detailed summary and analysis of CO2 capture through synthetic biotechnology, which also pave the way for implementing electrically driven combined strategies.

Hexagonal Mesoporous Silica for carbon capture: Unrevealing CO2 microscopic dynamics by Nuclear Magnetic Resonance

Global warming and environmental concerns have triggered global efforts to reduce anthropogenic carbon emission. Against this background, mesoporous silica materials have experienced a great expansion in the latest years due to their interesting carbon capture properties. Despite the very vast literature currently available in synthetic strategies and adsorption behaviour of MSs, the internal arrangement and diffusion properties of carbon dioxide (CO2) inside silica mesopores, to date, have been barely clarified. Here, mesoporous silica material with hexagonal framework (MCM-41) has been synthesized by a modified Stöber process, and its CO2 capture properties were assessed yielding a maximum amount of CO2 adsorbed of 18 wt% at 15 bar and RT. Fort the first time, microscopic distribution of CO2 and its mobility in the MCM-41 mesopores have been investigated by 13C NMR techniques. Peak fitting analysis of the 13C NMR spectra and T1-relaxometry data revealed a multiple component configuration for CO2 adsorbed in the silica mesopores with at least two physisorbed species coexisting. 13C PFG NMR self-diffusion study showed anisotropic long-range mobility for carbon dioxide adsorbed in MCM-41. The fastest self-diffusion coefficient, ascribed CO2 molecules diffusing parallel to the axis of the MCM-41 channels, was in the order of 10−5 cm2 s-1, i.e., two order of magnitude higher that of gas diffusing perpendicular to the mesopore. This study is crucial to properly address the future design and preparation of mesoporous silica materials with improved CO2 capture performances.

Biomass based N-doped porous carbons as efficient CO2 adsorbents and high-performance supercapacitor electrodes

In this report, a series of N-doped porous carbons were achieved using biomass lotus stalks as the precursor. A two-step synthesis method was employed to prepare carbonaceous adsorbents with different porous structure and surface chemical features. The as-obtained sorbents were characterized by multiple techniques and their CO2 adsorption properties were also comprehensively investigated. At 1 bar, these carbons demonstrate excellent CO2 uptake of 4.25 mmol g−1 at 25 °C and 6.59 mmol g−1 at 0 °C, respectively. The joint effect of narrow microporosity and doped N content was found to govern the CO2 adsorption capacity of these sorbents under 25 °C and 1 bar. Moreover, these biomass-derived carbons also display various other exceptional CO2 capture properties such as high CO2/N2 selectivity, excellent recyclability, suitable heat of adsorption, fast adsorption kinetics, and good dynamic adsorption capacity. The electrochemical study shows that this N-doped porous carbon based electrode possesses substantial specific capacitance (325F/g) and outstanding stability (retain rate of 95% after 5000 cycles). Therefore, these lotus stalk-based N-doped porous carbons have application possibility in CO2 capture and supercapacitor.

Construction of two new Co(II)-organic frameworks based on diverse metal clusters: Highly selective C2H2 and CO2 capture and magnetic properties

Two new Co(II)-complexes, namely, [(NH2Me2)2][Co4(L)2(μ2-O)2(H2O)5DMF]·2DMF·3H2O (1), [(NH2Me2)5][Co12(L)6(μ3-O)4(HCOO)(H2O)6]·2DMF·8H2O (2) were solvothermally constructed based on a rigid pyridine polycarboxylate ligand (H4L, 2,6-di(2′,5′-dicarboxyphenyl) pyridine). Complex 1 and 2 dislay 3D frameworks with various metal cluster. Complex 1 is a 3D porous framework with a (4,8)-connected topology featured by 1D pore structure in a-axis direction with binuclear cluster [Co2(COO)4O] and tetranuclear cluster [Co4(COO)8O2]. Complex 2 possess trinuclear cluster [Co3(COO)6O] and binuclear cluster [Co2(COO)5O], and it can be clearly observed that 2 is assembled by numbers of nano-cages by twisting a certain angle. Notably, the gas sorption behaviour investigation indicates that the desolvated 1a displays uptake capacity and adsorption selectivity to C2H2 and CO2 over CH4. Furthermore, the results of magnetic studies show that complex 2 exhibits antiferromagnetic interactions between Co2+ ions.

The new tailored nanoporous carbons from the common polypody (Polypodium vulgare): The role of textural properties for enhanced CO2 adsorption

The one-step synthesis of new tailored nanoporous carbons (NCs) from the common polypody (Polypodium vulgare) as feedstock for the first time was presented. The significance of nitrogen flow (2.25 – 30 dm3/h) and temperature (500 – 900 °C) during carbonization was investigated. KOH activated NCs have a high specific surface area (1994 m2/g), large total pore volume (0.998 cm3/g), and micropore volume (0.923 cm3/g). NCs displayed tailored textural properties for CO2 capture. The NCs showed superior CO2 adsorption at 1 bar equal to 5.67 and 9.05 mmol/g, for 298 and 273 K, respectively. The selectivity of CO2 adsorption in relation to N2 was also high. The selectivity coefficient was achieved to 23 and SIAST selectivity 59.5. The isosteric heat of adsorption calculated on the basis of the Clausius-Clapeyron equation and Sips model was ranged from 26 to 31 kJ/mol and suggested the physisorption mechanism of adsorption.

Nitrogen and sulfur co-doped porous carbons from polyacrylonitrile fibers for CO2 adsorption

BackgroundsAdsorption by adsorbents is accepted as a promising technology that can efficiently separate CO2 from flue gas. Optimal adsorption performance can be obtained by specific solid adsorbents with excellent CO2 adsorption capacity. MethodsIn this work, N, S co-doped porous carbons were synthesized from polyacrylonitrile fiber by a facile synthesis process i.e. hydrothermal treatment followed by KOH activation. N, S enriched hydrochar was obtained after hydrothermal treatment of polyacrylonitrile fiber and ammonium sulfide. Further KOH activation of hydrochar obtained N, S co-doped carbons with advanced porous structure. Significant findingsThis series of sorbents has the highest CO2 uptake of 3.37 and 5.23 mmol g−1 at 1 bar, 25 °C and 0 °C, respectively. Detailed investigation revealed that the mutual effects of narrow microporostiy, N and S content are responsible for the CO2 uptake of these adsorbents. Additionally, these adsorbents also show various good CO2 capture properties such as excellent recyclability, reasonable CO2/N2 selectivity, moderate heat of adsorption, fast adsorption kinetics, and good dynamic adsorption capacity. These findings suggest that N, S co-doped porous carbons derived from polyacrylonitrile fiber are potential promising sorbents for CO2 capture.

Scalable Polymeric Few-Nanometer Organosilica Membranes with Hydrothermal Stability for Selective Hydrogen Separation.

Nanoporous silica membranes exhibit excellent H2/CO2 separation properties for sustainable H2 production and CO2 capture but are prepared via complicated thermal processes above 400 °C, which prevent their scalable production at a low cost. Here, we demonstrate the rapid fabrication (within 2 min) of ultrathin silica-like membranes (∼3 nm) via an oxygen plasma treatment of polydimethylsiloxane-based thin-film composite membranes at 20 °C. The resulting organosilica membranes unexpectedly exhibit H2 permeance of 280-930 GPU (1 GPU = 3.347 × 10-10 mol m-2 s-1 Pa-1) and H2/CO2 selectivity of 93-32 at 200 °C, far surpassing state-of-the-art membranes and Robeson's upper bound for H2/CO2 separation. When challenged with a 3 d simulated syngas test containing water vapor at 200 °C and a 340 d stability test, the membrane shows durable separation performance and excellent hydrothermal stability. The robust H2/CO2 separation properties coupled with excellent scalability demonstrate the great potential of these organosilica membranes for economic H2 production with minimal carbon emissions.

Copper ions-assisted inorganic dynamic porogen of graphene-like multiscale microporous carbon nanosheets for effective carbon dioxide capture

The superior ultramicroporosity and enriched surface CO2-philic sites are simultaneously required features for high-efficiency carbon-based CO2 adsorbents. Unfortunately, these characteristics are usually incompatible and difficult to integrate into one porous carbon material. Herein, we report a new copper ions (Cu2+)-assisted dynamic porogen to construct hierarchically microporous carbon nanosheets in a large scale with high heterogeneity for solving such issue. Cu2+ can be equably dispersed in precursor by coordination interactions of COO-Cu and Cu-N, which can anchor more N/O-containing species in final product. The reduced cuprous ions (Cu+) in pyrolysis process functions as a dynamic porogen to tailor uniform ultramicropores. Importantly, copper salt extracted in this synthetic procedure allows cyclic utilization, realizing a green and low-cost process. The obtained carbon sheets possess a graphene-like morphology, a high surface area and a high-proportioned multiscale microporosity, especially a high-density ultramicropores of 0.4–0.7 nm and supermicroproes of 0.8–1.5 nm. The maximized synergistic effect of morphology, high density of multi-sized ultramicroporosity and surface high heterogeneity endow the resultant microporous carbon nanosheets with the remarkable CO2 capture property, including a high uptake, a moderate adsorption heat, a good selectivity and superior recyclability.

CO2 Capture by Hydroxylated Azine-Based Covalent Organic Frameworks.

Covalent organic frameworks (COFs) RIO-13, RIO-12, RIO-11, and RIO-11m were investigated towards their CO2 capture properties by thermogravimetric analysis at 1 atm and 40 °C. These microporous COFs bear in common the azine backbone composed of hydroxy-benzene moieties but differ in the relative number of hydroxyl groups present in each material. Thus, their sorption capacities were studied as a function of their textural and chemical properties. Their maximum CO2 uptake values showed a strong correlation with an increasing specific surface area, but that property alone could not fully explain the CO2 uptake data. Hence, the specific CO2 uptake, combined with DFT calculations, indicated that the relative number of hydroxyl groups in the COF backbone acts as an adsorption threshold, as the hydroxyl groups were indeed identified as relevant adsorption sites in all the studied COFs. Additionally, the best performing COF was thoroughly investigated, experimentally and theoretically, for its CO2 capture properties in a variety of CO2 concentrations and temperatures, and showed excellent isothermal recyclability up to 3 cycles.

Facilely Cross-Linking Polybenzimidazole with Polycarboxylic Acids to Improve H2/CO2 Separation Performance.

Polybenzimidazole (PBI) with a strong size-sieving ability exhibits attractive H2/CO2 separation properties for blue H2 production and CO2 capture. Herein, we report that PBI can be facilely cross-linked with polycarboxylic acids, oxalic acid (OA), and trans-aconitic acid (TaA) to improve its separation performance. The acids react with the amines on the PBI chains, decreasing free volume and increasing size-sieving ability. The acid doping increases H2/CO2 selectivity from 12 to as high as 45 at 35 °C. The acid-doped samples demonstrate stable H2/CO2 separation performance when challenged with simulated syngas containing water vapor at 150 °C, which surpasses state-of-the-art polymers and Robeson's upper bound for H2/CO2 separation.

Layered Double Hydroxides-Based Mixed Metal Oxides: Development of Novel Structured Sorbents for CO2 Capture Applications.

Layered double hydroxide (LDHs)-based mixed metal oxides (MMOs) are widely studied as the medium to high temperature (200-400 °C) CO2 capture sorbents. However, most of the studies are carried out using the powdered samples. To upgrade these sorbents for industrial-scale CO2 capture, it is important to move away from the powdered form and develop structured sorbents. Moreover, the CO2 capture properties of these sorbents need to be improved in terms of capture capacity and cycling stability. Here we are utilizing a modified amide hydrolysis method to improve the CO2 capture capacities of LDHs-based MMOs. Subsequently, aqueous exfoliation coupled with the freeze-drying technique was utilized to develop LDHs-based novel MMOs. Exfoliated LDH nano sheets were pelletized (2 mm) to circumvent the challenges associated with powder samples when used in industrial-scale applications. The obtained pellets have an average crushing load of 11.1 N and 4.3 MPa of compressive strength, which indicate their good mechanical stability. The MMOs pellets showed a narrow distribution of pores (8-10 nm) with very good surface area (264 m2/g) and pore volume (1.27 cm3/g). They also had much improved CO2 capture capacities at ambient pressure and both low (2.17 mmol/g, 30 °C) and medium temperature (1.43 mmol/g, 200 °C), as compared to previously reported pristine MMOs powder samples. The pelletized structured sorbents also outperformed commercial LDH-based pellets by several fold.

Theoretical Investigation of the CO2 Capture Properties of γ-LiAlO2 and α-Li5AlO4

Aim: The aim is to develop effective CO2 sorbent materials for fighting global climate change. Background: CO2 is one of the major combustion products which once released into the air can contribute to global climate change. There is a critical need for the development of new materials that can capture CO2 reversibly with acceptable energy and cost performance for these applications. Accordingly, solid sorbents have been reported to be promising candidates for CO2 sorbent applications through a reversible chemical transformation due to their high CO2 absorption capacities at moderate working temperatures. Methods: By combining first-principles density functional theory with phonon lattice dynamics calculations, the thermodynamic properties of the CO2 capture reaction by sorbent as a function of temperature and pressure can be determined without any experimental input beyond crystallographic structural information of the solid phases involved. The calculated thermodynamic properties are used to evaluate the equilibrium properties for the CO2 adsorption/desorption cycles. Results: Both γ-LiAlO2 and α-Li5AlO4 are insulators with wide band gaps of 4.70 and 4.76 eV, respectively. Their 1st valence bands just below the Fermi level are mainly formed by p orbitals of Li, O and Al as well as s orbital of Li. By increasing the temperature from 0 K up to 1500 K, their phonon free energies are decreased while their entropies are increased. The thermodynamic properties of CO2 capture reactions by γ-LiAlO2 and α-Li5AlO4 are calculated and used for comparing with other wellknown sorbent materials. Conclusion: The calculated thermodynamic properties of γ-LiAlO2 and α-Li5AlO4 reacting with CO2 indicate that LiAlO2 could be used for capturing CO2 at warm temperature range (500-800 K) while α- Li5AlO4 could be used for capturing CO2 at high-temperature range (800-1000 K), which are in good agreement with available experimental data.

Binder free novel synthesis of structured hybrid mixed metal oxides (MMOs) for high temperature CO2 capture

Here we report a novel, binder free simple post synthesis modification of layered double hydroxides (LDHs) to develop structured CO2 capture sorbents. The method involves the modification of LDHs with an organic modifier, melamine, to create the porosity and provide support for enhanced CO2 capture properties. The modified LDHs were pelletized (2 mm) to overcome the particle size issues associated with powder samples when used in the relevant process, e.g. in fixed bed reactors. The organic modifier, melamine, played a significant role in creating the porosity and providing support for the mixed metal oxides (MMOs) pellets. The CO2 capture capacity of the resultant hybrid pellets directly correlates with the amount of modifier used. The hybrid MMOs pellets captured 1.34 mmol of CO2 per g of sorbent at 200 °C and 1 bar, and they significantly outperformed their unmodified counterparts (0.35 mmol/g) and commercial (Pural MG70, SASOL) MMOs pellets (0.33 mmol/g). They also showed excellent cycling behaviour over 20 carbonation/regeneration cycles. This novel post synthesis modification method shows promise to develop LDH based MMOs structured sorbents that are suitable for industrial scale CO2 capture applications.