Carbon dioxide removal using calcium aluminate carbonates on titanic oxide under warm-gas conditions

Yu, Ching-Tsung; Kuo, Huan-Ting; Chen, Yiming

doi:10.1016/j.apenergy.2014.12.046

Cited by 18 publications

(8 citation statements)

References 37 publications

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“…To this end, there has been a wide variety of porous materials developed for CO 2 capture at both low and high temperatures. − Among solid adsorbents investigated so far, only a few materials such as calcium oxide (CaO), hydrotalcite (HT), calcium chabazite (CHA), alumina, and a few mixed-metal oxides have demonstrated favorable characteristics at elevated temperatures. ,− In large-scale CO 2 capture applications, CaO is advantageous compared to other adsorbents on account of higher capture capacity (∼17.9 mmol/g at above 600 °C), low cost, and wide availability of precursors such as limestones or dolomites; ,− however, high temperature regeneration (i.e., above 800 °C) and low stability due to sintering could outweigh these benefits. Additionally, slow sorption kinetics due to the formation of CaCO 3 which results in limited CO 2 diffusion is another challenge associated with the practical use of CaO-based adsorbents .…”

Section: Introductionmentioning

confidence: 99%

Development of Potassium- and Sodium-Promoted CaO Adsorbents for CO₂ Capture at High Temperatures

Al-Mamoori

Thakkar

et al. 2017

Ind. Eng. Chem. Res.

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Development of highly efficient adsorbents for the high temperature CO2 capture process is crucial for large scale implementation of this technology. In this work, development of novel potassium- and sodium-promoted CaO adsorbents (K–Ca and Na–Ca) is discussed, and their CO2 capture performance at high temperatures is presented. A series of K–Ca and Na–Ca adsorbents with various K/Ca or Na/Ca molar ratios were developed and tested for CO2 capture at high temperatures ranging from 300 to 400 °C. The structural, chemical, and morphological characteristics of the double salts were systematically evaluated before and after exposure to CO2. Our results indicated that CO2 capacity is largely influenced by both K or Na concentration and adsorption temperature. Maximum capacities of 3.8 and 3.2 mmol/g were obtained for K–Ca and Na–Ca double salts, respectively, at 375 °C and 1 bar. Further investigation of the effect of temperature revealed that the window temperature for operation ranges from 300 to 650 °C, while beyond 650 °C, the double salts start to decompose and lose capacity. Moreover, it was found that both adsorption kinetics and capacity improve with temperature, with CO2 uptake reaching a maximum at 10.7 mmol/g at 650 °C over K–Ca double salt. This study represents alkali metal-promoted CaO adsorbents as potential high-temperature adsorbents with similar performance to their MgO-based analogues.

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Section: Introductionmentioning

confidence: 99%

Development of Potassium- and Sodium-Promoted CaO Adsorbents for CO₂ Capture at High Temperatures

Al-Mamoori

Thakkar

et al. 2017

Ind. Eng. Chem. Res.

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“…This approach effectively reduces the solid substance staying time of the calcination but does not work as expected. , Therefore, adding nano inert carriers to calcium-based adsorbents is proposed further based on the approach mentioned above, which can effectively slow down sintering. At present, many inert materials have been studied, such as SiO 2 , − ZrO 2 , , Al 2 O 3 , , La 2 O 3 , Y 2 O 3 , Cr 2 O 3 , CuO, TiO 2 , MnO 2 , MgO, − etc. However, the adhesion behavior between an inert carrier and an adsorbent occurs at high temperatures and results in the loss of reactive sites gradually with chemical reaction processing.…”

Section: Introductionmentioning

confidence: 99%

Influence of Vacancy Defect of Calcium Oxide Surface on the Wettability of Molten Alkali Metal Salt in Calcium Looping Process

et al. 2021

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The influence of the vacancy defect of the CaO surface on the wettability of molten alkali metal salt was studied by molecular dynamics simulations. The results indicated that in the temperature range of 800–1100 K, the molten Na2SO4 on both VDcalcium and VDoxygen defect surfaces presented a poor wettability compared to that on the complete surface. Measurement of the density profile and the contact angle of the molten Na2SO4 showed that the higher the temperature and defect concentration, the worse the wettability. The micromechanism was revealed by calculating the polarization intensity that the vacancy defect surface led to the formation of the induced dipole moment in the molten Na2SO4. Induced polarization caused by defect surfaces reduces the wettability of Na2SO4. More importantly, as the temperature and defect concentration increase, various defect surfaces form loose and local weak liquidity structures. These structures are beneficial for the diffusion of carbon dioxide into the solid, but the reduction in the spreading area caused by poor wettability causes the efficiency of the CaL to decline. The vibration difference between Na2SO4 and CaO increases with the increased temperature and defect concentration. This means that the thermal energy transportability at the interface is suppressed by poor wettability.

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“…The incorporation of titanium additives can introduce calcium titanium oxide (CaTiO 3 ) into CaO-based adsorbents. This introduction can be expected to alleviate the CaO-based adsorbent sintering problem, owing to its thermal stability at the working temperature of CaO-based adsorbents [24,25]. Yu et al used the precipitation and deposition method to prepare Ca/Al/Ti sorbents.…”

Section: Introductionmentioning

confidence: 99%

Multicycle Performance of CaTiO3 Decorated CaO-Based CO2 Adsorbent Prepared by a Versatile Aerosol Assisted Self-Assembly Method

2021

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Calcium oxide (CaO) is a promising adsorbent to separate CO2 from flue gas. However, with cycling of carbonation/decarbonation at high temperature, the serious sintering problem causes its capture capacity to decrease dramatically. A CaTiO3-decorated CaO-based CO2 adsorbent was prepared by a continuous and simple aerosol-assisted self-assembly process in this work. Results indicated that CaTiO3 and CaO formed in the adsorbent, whereas CaO gradually showed a good crystalline structure with increased calcium loading. Owing to the high thermal stability of CaTiO3, it played a role in suppressing the sintering effect and maintaining repeated high-temperature carbonation and decarbonation processes. When the calcium and titanium ratio was 3, the CO2 capture capacity was as large as 7 mmol/g with fast kinetics. After 20 cycles under mild regeneration conditions (700 °C, N2), the performance of CO2 capture of CaTiO3-decorated CaO-based adsorbent nearly unchanged. Even after 10 cycles under severe regeneration conditions (920 °C, CO2), the performance of CO2 capture still remained nearly 70% compared to the first cycle. The addition of CaTiO3 induced good and firm CaO dispersion on its surface. Excellent kinetics and stability were evident.

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Carbon dioxide removal using calcium aluminate carbonates on titanic oxide under warm-gas conditions

Cited by 18 publications

References 37 publications

Development of Potassium- and Sodium-Promoted CaO Adsorbents for CO₂ Capture at High Temperatures

Development of Potassium- and Sodium-Promoted CaO Adsorbents for CO₂ Capture at High Temperatures

Influence of Vacancy Defect of Calcium Oxide Surface on the Wettability of Molten Alkali Metal Salt in Calcium Looping Process

Multicycle Performance of CaTiO3 Decorated CaO-Based CO2 Adsorbent Prepared by a Versatile Aerosol Assisted Self-Assembly Method

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Carbon dioxide removal using calcium aluminate carbonates on titanic oxide under warm-gas conditions

Cited by 18 publications

References 37 publications

Development of Potassium- and Sodium-Promoted CaO Adsorbents for CO2 Capture at High Temperatures

Development of Potassium- and Sodium-Promoted CaO Adsorbents for CO2 Capture at High Temperatures

Influence of Vacancy Defect of Calcium Oxide Surface on the Wettability of Molten Alkali Metal Salt in Calcium Looping Process

Multicycle Performance of CaTiO3 Decorated CaO-Based CO2 Adsorbent Prepared by a Versatile Aerosol Assisted Self-Assembly Method

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Development of Potassium- and Sodium-Promoted CaO Adsorbents for CO₂ Capture at High Temperatures

Development of Potassium- and Sodium-Promoted CaO Adsorbents for CO₂ Capture at High Temperatures