Dry Carbonate Sorbents for CO<sub>2</sub> Capture from Flue Gases: Role of Support in Adsorption Efficiency and Thermal Stability

Dry Carbonate Sorbents for CO<sub>2</sub> Capture from Flue Gases: Role of Support in Adsorption Efficiency and Thermal Stability

This study presents the results of an investigation of carbonate-containing sorbents for CO<sub>2</sub> capture with natural support materials—kaolin and calcium carbonate—at various loadings of the active phase of Na<sub>2</sub>CO<sub>3</sub>. The effects of the...

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Main Authors: Bolatbek Khussain, Alexandr Sass, Alexandr Brodskiy, Murat Zhurinov, Ivan Torlopov, Kenzhegul Rakhmetova, Daulet Zhumadullaev, Yerzhan Boleubayev, Atabek Khussain, Abzal Kenessary, Adel Sarsenova, Tumen Darzhokov
Format: Article
Language:English
Published: MDPI AG 2025-07-01
Series:Molecules
Subjects:
CO<sub>2</sub> capture
chemisorption
carbonate-based sorbents
kaolin
calcium carbonate
thermal stability
Online Access:https://www.mdpi.com/1420-3049/30/13/2859
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Summary:This study presents the results of an investigation of carbonate-containing sorbents for CO<sub>2</sub> capture with natural support materials—kaolin and calcium carbonate—at various loadings of the active phase of Na<sub>2</sub>CO<sub>3</sub>. The effects of the support type on the distribution of the active component, phase composition, and pore structure of the sorbents were studied. It was found that a Na<sub>2</sub>CO<sub>3</sub> loading of 25 wt.% provides the best balance between sorption capacity and technological feasibility. The thermal stability and regeneration capacity of the sorbents were evaluated under high-temperature conditions, revealing high thermal stability of the Na<sub>2</sub>CO<sub>3</sub>/CaCO<sub>3</sub> system up to 1000 °C, along with its durability over multiple adsorption–desorption cycles. Kinetic studies on the Na<sub>2</sub>CO<sub>3</sub>/CaCO<sub>3</sub> sorbent using the shrinking core model demonstrated that the overall CO<sub>2</sub> chemisorption process is controlled by surface chemical reaction at temperatures below 50 °C. The obtained results demonstrate the high potential of CaCO<sub>3</sub>-based sorbents for practical applications in low-temperature CO<sub>2</sub> capture technologies. A promising direction for the use of such sorbents within CCUS is the development of integrated systems, where CO<sub>2</sub> capture is combined with its conversion into valuable products (e.g., methane, methanol, formic acid) through catalytic processes.
ISSN:1420-3049

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