Moderate-Temperature Carbon Capture Using Thermally Pre-Treated Dolomite: A Novel Approach
This study investigates a novel approach to moderate-temperature carbon capture by examining the enhanced performance of thermally pre-treated dolomite. To obtain mixed oxides, dolomite samples were prepared via calcination in a quartz cylindrical furnace under an ambient atmosphere at 900 °C, and s...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-06-01
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| Series: | C |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2311-5629/11/2/37 |
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| Summary: | This study investigates a novel approach to moderate-temperature carbon capture by examining the enhanced performance of thermally pre-treated dolomite. To obtain mixed oxides, dolomite samples were prepared via calcination in a quartz cylindrical furnace under an ambient atmosphere at 900 °C, and subsequently thermally pre-treated under an inert (argon) stream at 650 °C. Characterization of the as-prepared samples involved morphological, structural, textural, and optical features examined through XRD, BET, SEM-EDS, FT-IR, and RAMAN, XPS, and UV-vis spectroscopy, whereas TGA and subsequent multicyclic tests were used to study the CO<sub>2</sub> sorption. The dolomite sample calcined at 900 °C for 60 min, and after being activated under an inert atmosphere (argon), labeled PCD60Act, exhibited the highest CO<sub>2</sub> uptake of 0.477 g<sub>CO2</sub>/g<sub>sorbent</sub>; after 15 sorption–regeneration cycles, it still retained a CO<sub>2</sub> uptake of 0.38 g<sub>CO2</sub>/g<sub>sorbent</sub> at 650 °C, and it was also successfully regenerated at this moderate temperature, demonstrating 84% capture capacity retention. These remarkable results are explained by the crystalline defects generated during the thermal pre-treatments of the dolomite. This research offers valuable perspectives on the viability of employing thermally pre-treated dolomite as an inexpensive, thermally stable, and moderate-temperature regenerable CaO-based sorbent for applications in CO<sub>2</sub> removal in the context of integrated carbon capture and conversion (ICCC) for the production of high-purity hydrogen. |
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| ISSN: | 2311-5629 |