Thermokinetic and conductivity analyzes of the high CO2 chemisorption on Li5AlO4 and alkaline carbonate impregnated Li5AlO4 samples: Effects produced by the use of CO2 partial pressures and oxygen addition

Sánchez-Camacho, Pedro; Gómez-García, J. Francisco; Pfeiffer, Heriberto

doi:10.1016/j.jechem.2017.05.008

Cited by 19 publications

(13 citation statements)

References 36 publications

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“…The common finding is that as diffusion of O 2from the bulk sorbent to the surface is the main kinetic limiting factor for the formation of a carbonate phase, the addition of O2 to the gas phase improves the availability of O2 for carbonation, increasing the absorption rate and overall capacity. This effect was observed for a range of materials including Li6WO6 nanowires [464], Li5FeO4 [473] and Li5AlO4 [582], [583], with activation energies for O 2diffusion derived from CO2 absorption measurements again in line with experimental values of 1 -2 eV.…”

Section: Connection Between Ionic Conduction and Co2 Absorption In LIsupporting

confidence: 70%

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

Dunstan¹,

Donat²,

Bork³

et al. 2021

Preprint

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Carbon dioxide capture and mitigation forms a key part of the technological response to combat climate change and reduce CO2 emissions. Solid materials capable of reversibly absorbing CO2 have been the focus of intense research for the past two decades, promising stability and low energy costs to implement and operate compared to the more widely used liquid amines. In this Review, we explore the fundamental aspects underpinning solid CO2 sorbents based on alkali and alkaline earth metal oxides operating at mid- to high temperature: how their structure, chemical composition and morphology impact their performance and long-term use. Various optimization strategies are outlined to improve upon the most promising materials, and we combine recent advances across disparate scientific disciplines including materials discovery, synthesis, and in situ characterization to present a coherent understanding of the mechanisms of CO2 absorption both at surfaces and within solid materials.

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Section: Connection Between Ionic Conduction and Co2 Absorption In LIsupporting

confidence: 70%

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

Dunstan¹,

Donat²,

Bork³

et al. 2021

Preprint

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“…Even when the Co—O vibration band is detected using ATR‐FTIR, this can be from unreacted NaCoO 2 or a cobalt oxide. Therefore, in reactions and , the formation of a cobalt oxide is proposed, as for this type of alkaline ceramics, CO 2 capture always leads to the formation of carbonates and the corresponding metal oxide . As stated in the literature, NaCoO 2 does not chemisorb CO 2 at temperatures lower than 200 °C, on dry conditions.…”

Section: Resultsmentioning

confidence: 89%

“…Within the context of using alkaline elements for CO 2 capture, as it is previously described for Na 2 CO 3 , different alkaline ceramics have shown high CO 2 sorption capacities as well as good kinetics, selectivity, and cyclability in a wide temperature range . In these materials, CO 2 capture at the low‐temperature range and in dry conditions is usually poor, achieving improvements only when the particle surface area is highly increased or when their chemical surface is modified .…”

Section: Introductionmentioning

confidence: 98%

CO₂—H₂O Capture and Cyclability on Sodium Cobaltate at Low Temperatures (30–80 °C): Experimental and Theoretical Analysis

2019

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Sodium cobaltate (NaCoO2) is analyzed for the CO2 cyclic carbonation–decarbonation process at low temperatures (30–80 °C) with relative humidity (RH) values between 0% and 80%, using water vapor as a catalytic intermediate. The presence of H2O clearly enhances the CO2 capture at T < 100 °C, compared with dry conditions, where the amount of CO2 captured increases as a function of RH. These improvements are attributed to the formation of NaHCO3 and Na2CO3 during carbonation. In the case of NaHCO3, water vapor becomes a part of carbonation, favoring reactivity. After the carbonation analysis, the decarbonation process is analyzed using a N2 flow, where results evidence that only NaHCO3 decomposition takes place at low temperatures, producing NaOH and CO2. This result indicates that NaCoO2 can be partially regenerated, suggesting a possible CO2 cyclic carbonation. CO2 carbonation–decarbonation tests are performed, confirming the cyclic capacity and stability. Moreover, the NaCoO2 sample is modified by adding different transition metals (Fe, Cu, and Ni) to improve CO2—H2O sorption under similar physicochemical conditions. Results indicate that Fe‐containing samples present the best properties. Finally, the effect of CO2 partial pressure on NaCoO2 and Fe‐containing samples is analyzed using similar RHs.

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“…Ionic conductivity and activation energy analyses confirmed the oxygen viability is very important for the carbonation process of Li5AlO4. 167 2Li5AlO4 + 5CO2 → 5Li2CO3 + Al2O3…”

Section: Lithium Aluminatesmentioning

confidence: 99%

Recent advances in lithium containing ceramic based sorbents for high-temperature CO₂ capture

et al. 2019

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Thermokinetic and conductivity analyzes of the high CO2 chemisorption on Li5AlO4 and alkaline carbonate impregnated Li5AlO4 samples: Effects produced by the use of CO2 partial pressures and oxygen addition

Cited by 19 publications

References 36 publications

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

CO₂—H₂O Capture and Cyclability on Sodium Cobaltate at Low Temperatures (30–80 °C): Experimental and Theoretical Analysis

Recent advances in lithium containing ceramic based sorbents for high-temperature CO₂ capture

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Thermokinetic and conductivity analyzes of the high CO2 chemisorption on Li5AlO4 and alkaline carbonate impregnated Li5AlO4 samples: Effects produced by the use of CO2 partial pressures and oxygen addition

Cited by 19 publications

References 36 publications

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

CO2—H2O Capture and Cyclability on Sodium Cobaltate at Low Temperatures (30–80 °C): Experimental and Theoretical Analysis

Recent advances in lithium containing ceramic based sorbents for high-temperature CO2 capture

Contact Info

Product

Resources

About

CO₂—H₂O Capture and Cyclability on Sodium Cobaltate at Low Temperatures (30–80 °C): Experimental and Theoretical Analysis

Recent advances in lithium containing ceramic based sorbents for high-temperature CO₂ capture