2024-10-10
ZeroCAL: Eliminating Carbon Dioxide Emissions from Limestone’s Decomposition to Decarbonize Cement Production
2024-10-10 • Adriano Souza Leão, Marie Collin, Swarali Ghodkhande, Arnaud Bouissonnié, Xin Chen, Benjamin Malin, Yiming Liu, Geanna Hovey, Jagannathan Govindhak...
Limestone (calcite, CaCO<sub>3</sub>) is an abundant and cost-effective source of calcium oxide (CaO) for cement and lime production. However, the thermochemical decomposition of limestone (∼800 °C, 1 bar) to produce lime (CaO) results in substantial carbon dioxide (CO<sub>2(g)</sub>) emissions and energy use, i.e., ∼1 tonne [t] of CO<sub>2</sub> and ∼1.4 MWh per t of CaO produced. Here, we describe a new pathway to use CaCO<sub>3</sub> as a Ca source to make hydrated lime (portlandite, Ca(OH)<sub>2</sub>) at ambi…