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...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/404057 |
| Acceso en línea: | http://hdl.handle.net/10261/404057 https://api.elsevier.com/content/abstract/scopus_id/105014003236 |
| Access Level: | acceso abierto |
| Palabra clave: | Ca/ZnO CO2 capture High-temperature CO2 adsorbents Thermochemical CO2 capture |
| Sumario: | 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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