What sorbent is used to capture the CO2 from ambient air in the air- capture collector?

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What sorbent is used to capture the CO2 from ambient air in the air- capture collector?

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GRT used sodium hydroxide (NaOH) in its very early work on CO2 air-capture. Currently a different sorbent which is proprietary in nature is used. This new sorbent represents a major step forward in air-capture as it greatly reduces the energy consumed in the process and avoids the toxicity issues associated with sodium hydroxide (lye).

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