Geopolymer-hydrotalcite composites for CO2 capture

Papa, Elettra; Medri, Valentina; Paillard, Clara; Contri, B.; Murri, Annalisa Natali; Vaccari, Angelo; Landi, Elena

doi:10.1016/j.jclepro.2019.117738

Cited by 35 publications

(14 citation statements)

References 30 publications

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“…These advancements could translate into an increase in the amount of hydration products and an associated densification of the microstructure, which could provide improved resistance against carbonation. Additionally, the formation of a hydrotalcite phase with layered double hydroxides could increase CO2 absorption [27,28] and enhance the resistance to carbonation in AAS systems [29,30]. Furthermore, the reaction between hydrated reactive MgO and CO2 can form HMC phases [31,32], which can provide a binding network that fills the pore space and decreases the diffusivity of CO2, thereby improving the carbonation resistance of SCAS mixes.…”

Section: Introductionmentioning

confidence: 99%

Improving the carbonation resistance of Na2CO3-activated slag mixes via the use of reactive MgO and nucleation seeding

Dũng

Hooper²,

Unluer³

2021

Cement and Concrete Composites

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When exposed to carbonation, Na2CO3-activated slag (SCAS) concrete demonstrated 53% mass loss and 57% reduction in compressive strength due to the decalcification of C-(A)-S-H.Improvements in the carbonation resistance of SCAS mixes via the inclusion of hydromagnesite seeds (S) and reactive MgO (M) were reported in this study. The conversion of MgO into hydrated magnesium carbonates (HMCs) and the additional formation of hydrotalcite were observed in the presence of these additives. HMCs contributed to the binding network and limited the diffusion of CO2 into the sample. The decalcification of C-(A)-S-H was retarded via the absorption of CO2 in hydrotalcite, producing huntite. These changes in the reaction kinetics of samples involving M and S enabled the retention of hydration products and formation of additional carbonation products, leading to denser microstructures and ~40% increase in compressive strength after carbonation, which was ~10 times higher than the control sample (58 vs. 6 MPa).

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Section: Introductionmentioning

confidence: 99%

Improving the carbonation resistance of Na2CO3-activated slag mixes via the use of reactive MgO and nucleation seeding

Dũng

Hooper²,

Unluer³

2021

Cement and Concrete Composites

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Section: Adsorption Propertiesmentioning

confidence: 93%

“…Our prepared D1 materials had CO₂ adsorption capacities in the range of 0.3-0.7 mmol/g, whereas, for example, the Geopolymer-hydrotalcite composites that were investigated for CO₂ capture had adsorption capacities in the range of 0.11-0.46 mmol/g [55]. Further comparisons with other published materials [50,55,56] are shown in Table 5. Comparison of adsorption capacity with other publications showed that alkali-activated zeolite foams had a higher adsorption capacity than natural zeolite (clinoptilolite) and geopolymers, but, on the other hand, a lower adsorption capacity than synthetic zeolites, which are more expensive to prepare.…”

Section: Adsorption Propertiesmentioning

confidence: 93%

Influence of the Addition of Blast Furnace Slag to Alkali-Activated Mixtures Based on Natural Zeolites

et al. 2021

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This study focuses on a comparison of alkali-activated materials based on natural zeolites without and with the addition of blast furnace slag and their subsequent modification by acid leaching. The addition of slag to alkali-activated mixtures is generally used to increase the strength. The subsequent modification of its chemical, textural and mechanical properties by acid leaching makes this material usable in other industries, especially in the chemical industry. This study aimed to examine the influence of the addition of blast furnace slag to alkali-activated mixtures based on natural zeolites and observe the effect of subsequent acid leaching on the chemical, textural and mechanical properties and CO2 adsorption capacity of these materials. The modification of alkali-activated materials was carried out by acid leaching using 0.1 M HCl and then using 3 M HCl. The properties of these materials were determined using N2 physisorption, Hg porosimetry, XRF, XRD, DRIFT, TGA and strength measurements. The results showed that the addition of blast furnace slag significantly increased the cutting-edge strength of the obtained materials and affected the textural properties, especially in leached samples. The presence of blast furnace slag generated a higher proportion of mesopores, which are attributed to the presence of the calcium silicate hydrate (C–S–H) phase and are easily removed by leaching, as shown by the XRF results. The obtained data showed an improvement in properties and extension of the potential applicability of these materials in the chemical industry, especially for catalytic and adsorption applications.

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“…Apart from improving the CO 2 capture capacity and cycling stability, overcoming the particle size issue is a very important aspect on the development of CO 2 capture sorbents. There are efforts to address these issues in other high temperature sorbents such as CaO and Li 4 SiO 4 by developing structured forms of the materials. − However, these issues have been largely ignored for LDH-based MMOs sorbents. , …”

Section: Introductionmentioning

confidence: 99%

Layered Double Hydroxides-Based Mixed Metal Oxides: Development of Novel Structured Sorbents for CO₂Capture Applications

Veerabhadrappa

Maroto‐Valer

Chen

et al. 2021

ACS Appl. Mater. Interfaces

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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.

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Geopolymer-hydrotalcite composites for CO2 capture

Cited by 35 publications

References 30 publications

Improving the carbonation resistance of Na2CO3-activated slag mixes via the use of reactive MgO and nucleation seeding

Improving the carbonation resistance of Na2CO3-activated slag mixes via the use of reactive MgO and nucleation seeding

Influence of the Addition of Blast Furnace Slag to Alkali-Activated Mixtures Based on Natural Zeolites

Layered Double Hydroxides-Based Mixed Metal Oxides: Development of Novel Structured Sorbents for CO₂Capture Applications

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Geopolymer-hydrotalcite composites for CO2 capture

Cited by 35 publications

References 30 publications

Improving the carbonation resistance of Na2CO3-activated slag mixes via the use of reactive MgO and nucleation seeding

Improving the carbonation resistance of Na2CO3-activated slag mixes via the use of reactive MgO and nucleation seeding

Influence of the Addition of Blast Furnace Slag to Alkali-Activated Mixtures Based on Natural Zeolites

Layered Double Hydroxides-Based Mixed Metal Oxides: Development of Novel Structured Sorbents for CO2Capture Applications

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Layered Double Hydroxides-Based Mixed Metal Oxides: Development of Novel Structured Sorbents for CO₂Capture Applications