Thermokinetic Analysis of Carbon Dioxide Chemical Capture Using a Nickel-Containing Alkaline Ceramic (Li 2 NiO 2 )
Year: 2026
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide Dilithium nickel(II) oxide (Li 2 NiO 2 ) was synthesized by a solid-state reaction and structurally and microstructurally characterized. Then, it was tested as a carbon dioxide (CO 2 ) chemisorbent through dynamic and isothermal thermogravimetric analyses. Sample characterization indicated that the synthesized Li 2 NiO 2 contained a small highly dispersed NiO phase as a secondary phase. CO 2 capture performed on Li 2 NiO 2, through dynamic experiments using different carbon dioxide partial pressures, showed that it had a low CO 2 uptake at low temperatures (200–500 °C) but much higher uptakes at higher temperatures (550–700 °C) regardless of the CO 2 concentration. Isothermal trends and solid product characterization allowed us to elucidate the reaction pathway, implying the lithium-deficient (Li 1– x Ni x O 2 ) crystal phase formation as reactive intermediates, as well as nickel oxide and lithium carbonate as final products. The reaction path evolution showed that low CO 2 concentrations modified the external core–shell microstructure (porosity and specific surface area), which consequently favored CO 2 capture. Complementarily, a kinetic analysis was performed via the Avrami–Erofeev model, the results of which were compared against different alkaline ceramics used for CO 2 capture at high temperatures, revealing the positive performance of Li 2 NiO 2 .
Institutions: Universidad Nacional Autónoma de México, CIC energiGUNE
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
Awards: G2045117430, G4857521017
OpenAlex ID: W7135392250