Unveiling the potential of CaO-modified ZnO adsorbents for CO2 capture
Intermediate-high temperature adsorbents are of interest as they can be used in process intensification and integrated CO2 capture and conversion processes to couple gas separation with a chemical reaction. Herein we develop CaO-modified ZnO as a new intermediate-high temperature CO2 adsorbent and s...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
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| Series: | Carbon Capture Science & Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S277265682500123X |
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| Summary: | Intermediate-high temperature adsorbents are of interest as they can be used in process intensification and integrated CO2 capture and conversion processes to couple gas separation with a chemical reaction. Herein we develop CaO-modified ZnO as a new intermediate-high temperature CO2 adsorbent and show that the extent of CaO doping allows tuning of the CO2 adsorption/desorption temperature as well as capture capacity. Five different adsorbents were synthesized with Ca loadings of 0 %, 1 %, 5 %, 10 %, and 15 % by weight on ZnO and tested via fixed bed reactor experiments and TGA-DSC. The highest adsorption capacity was found to be 0.73 mmol/gcat for 5 %Ca/ZnO. The desorption temperatures for CO2 was found to also be influenced by Ca loading. Adsorbents were characterised by XRD, SEM, TGA, BET and ICP-MS, to understand their structure it was determined that CaO deposits on ZnO pores as separate domains. Herein we develop CaO-modified ZnO as a novel intermediate-high temperature CO₂ adsorbent, demonstrating tuneable adsorption/desorption characteristics through CaO dispersion on a ZnO scaffold. |
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| ISSN: | 2772-6568 |