Japanese chemists have developed the fastest carbon dioxide trap

A research team led by Professor Seiji Yamazoe has been working on direct capture technology

and air purification (Direct Air Capture).Scientists have studied various materials that could improve the efficiency of devices based on a liquid-solid separation system. The study showed that isophorone diamine (IPDA) in such devices removes carbon dioxide at low concentrations found in the atmosphere with an efficiency of 99%.

In their device, chemists use waterIPDA solution. This amine captures the carbon dioxide contained in the air and turns it into a solid residue of carbamic acid. In a paper published in the American Chemical Society journal ACS Environmental Au, the scientists showed that such a system is easy to reuse. It is sufficient to heat the solution to 60°C to completely release the trapped carbon dioxide and restore the original liquid.

The researchers also note the high speeddevice operation: 201 mmol/h per 1 mol IPDA. This, according to the authors, is twice as fast as all known direct air capture and purification devices operating at low gas concentrations.

Chemists say existing systems are badcope with atmospheric air. The concentration of carbon dioxide in it is usually insufficient for chemical reactions to proceed quickly enough. The second problem is the difficulty in releasing the collected carbon dioxide: as a rule, it requires high energy costs and makes production inefficient.

The developers believe that the new system eliminates these problems and opens up opportunities for industrial use of carbon dioxide traps.

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