摘要
Cement production is a carbon-intensive industrial process, with the sector contributing ∼8% of global anthropogenic CO2 emissions. On average, producing each kilogram of cement leads to the emission of 1 kg of CO2─the combination of fuel combustion emissions and carbon released from the feedstock, limestone (CaCO3). Here we report electrochemical cement production based on anion-mediated electrochemical calcium extraction (ECE) that addresses both feedstock and energy emissions. The in situ-generated acidic electrolytes release the feedstock CO2 emissions at high purity, enabling direct carbon utilization or sequestration without costly capture and purification steps. Energy embodied within a separate H2 output stream is sufficient to sinter Ca(OH)2 to produce portland cement, thus removing the CO2 emissions associated with fuel combustion. We then replace CaCO3 with a carbon-free calcium feedstock, gypsum, thereby removing the CO2 emissions embodied in the feedstock. Technoeconomic analysis forecasts that this method could provide a viable, decarbonized cement alternative.
原文 | English |
---|---|
頁(從 - 到) | 4694-4701 |
頁數 | 8 |
期刊 | ACS Energy Letters |
卷 | 8 |
發行號 | 11 |
DOIs | |
出版狀態 | Published - 10 11月 2023 |