2021
DOI: 10.1021/acs.energyfuels.0c04385
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Metal-Doped K–Ca Double Salts with Improved Capture Performance and Stability for High-Temperature CO2 Adsorption

Abstract: In an effort to develop high-temperature CO 2 adsorbents, we report on the improvement of CO 2 capture performance of our previously developed potassium-promoted CaO double salts (K−Ca) through metal doping with iron and indium. The morphological, chemical, and structural characteristics of K−Ca doped metals were systematically evaluated while their CO 2 capture behavior was investigated at 500−700 °C. Our initial screening tests identified the optimum loading for Fe and In to be 3 wt % with Fe 3 /K−Ca and In … Show more

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Cited by 16 publications
(10 citation statements)
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“…Double carbonates have similar melting temperatures as the single alkali metal carbonates but possess different thermodynamic properties: in an N 2 atmosphere, they decompose to CaO and the single alkali metal carbonate at temperatures similar to, or even lower than, CaCO 3 , whereas in a CO 2 atmosphere, they do not decompose even when they reach their melting point (in contrast to many Mg-based double carbonates ). Double carbonates have therefore been used as sorbents for CO 2 achieving higher cyclic CO 2 uptake capacities than those that were observed for the reference CaO sorbent even at lower sorption temperatures; ,, the regeneration of the sorbents was always performed under N 2 . Other studies utilized the low eutectic temperatures of the carbonate mixtures to fabricate sorbents coated with molten salts under reaction conditions, which is an approach similar to what is typically employed to enable fast sorption rates for MgO-based sorbents (section ).…”
Section: Materials Optimizationmentioning
confidence: 99%
“…Double carbonates have similar melting temperatures as the single alkali metal carbonates but possess different thermodynamic properties: in an N 2 atmosphere, they decompose to CaO and the single alkali metal carbonate at temperatures similar to, or even lower than, CaCO 3 , whereas in a CO 2 atmosphere, they do not decompose even when they reach their melting point (in contrast to many Mg-based double carbonates ). Double carbonates have therefore been used as sorbents for CO 2 achieving higher cyclic CO 2 uptake capacities than those that were observed for the reference CaO sorbent even at lower sorption temperatures; ,, the regeneration of the sorbents was always performed under N 2 . Other studies utilized the low eutectic temperatures of the carbonate mixtures to fabricate sorbents coated with molten salts under reaction conditions, which is an approach similar to what is typically employed to enable fast sorption rates for MgO-based sorbents (section ).…”
Section: Materials Optimizationmentioning
confidence: 99%
“…For In-CaO/ZSM-5, this promotional behavior was anticipated as In 2 O 3 is known to increase the CaO affinity toward CO 2 , thus increasing the working adsorption capacity. 44 To the best of our knowledge, this behavior has not been observed for MoO 3 previously; however, given that the valence electron orientations for the Mo 6+ and In 3+ orbitals are similar, 45,46 molybdenum exhibiting a promotional effect on CO 2 tethering with CaO is not unreasonable. Granted, the degree to which this promotional effect is beneficial on the combined adsorption/catalysis performance is arguable, as the In-CaO/ZSM-5 (Figure 6c)…”
Section: Resultsmentioning
confidence: 98%
“…On the other hand, there were clear differences in adsorption capacity between the samples during the dynamic capture/conversion experiments (Table ) Therein, the Mo- and In-doped monoliths displayed considerably higher adsorption capacities compared to the other monoliths, likely signifying some promotional effect on CO 2 adsorption from these metals. For In-CaO/ZSM-5, this promotional behavior was anticipated as In 2 O 3 is known to increase the CaO affinity toward CO 2 , thus increasing the working adsorption capacity . To the best of our knowledge, this behavior has not been observed for MoO 3 previously; however, given that the valence electron orientations for the Mo 6+ and In 3+ orbitals are similar, , molybdenum exhibiting a promotional effect on CO 2 tethering with CaO is not unreasonable.…”
Section: Resultsmentioning
confidence: 99%
“…The rapid growth of population, urbanization, and industrialization calls for an ever-increasing massive energy demand. 1 To meet this, a majority of the available carbonaceous fossil fuels such as coal, petroleum, and conventional and unconventional natural gases are combusted, emitting large quantities of CO 2 . The excessive CO 2 concentration in the atmosphere via the greenhouse gas effect is believed to contribute to the melting of glaciers, sea level rise, ocean acidification, catastrophic floods, raging tsunamis, global warming, and epidemic spread, leading to the most challenging climate-change-related concerns the world is currently facing.…”
Section: Introductionmentioning
confidence: 99%