A Transformative Low-Cost Approach for Direct Air Mineralization of CO2 via Repeated Cycles of Ambient Weathering of Metal Oxides

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Exploratory Topics
San Francisco, California
Project Term:
09/06/2021 - 09/05/2022

Technology Description:

One promising method for reducing atmospheric CO2 is a repeated enhanced weathering process, in which a natural reaction between CO2 in air and magnesium- and/or calcium-rich minerals is accelerated to form a solid carbonate that can be processed to regenerate the minerals for reuse and create a captured CO2 stream. The proposed technology combines enhanced weathering innovations with an engineered system that passively exposes these reactive minerals to the air. The approach may significantly reduce the cost of permanent, high-quality carbon removal, and the resulting pure CO2 can be permanently stored or sold for use. The process has the potential to remove 1 gigaton of CO2 by 2035, at a cost of $50/tCO2.


ARPA-E Program Director:
Dr. Marina Sofos
Project Contact:
Shashank Samala
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