Climate Change

Researchers have created emissions-free cement

These tankers are full of carbon dioxide at a cement plant. Image: REUTERS/David Stanway - RC185DB5B900

David L. Chandler

Writer, MIT News

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In a demonstration of the basic chemical reactions used in the new process, electrolysis takes place in neutral water. Dyes show how acid (pink) and base (purple) are produced at the positive and negative electrodes. A variation of this process can be used to convert calcium carbonate (CaCO3) into calcium hydroxide (Ca(OH)2), which can then be used to make Portland cement without producing any greenhouse gas emissions. Cement production currently causes 8 percent of global carbon emissions.
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Climate ChangeFuture of the EnvironmentFourth Industrial Revolution
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