GIST research team led by professor Ji-Woong Park has developed material in solid form that absorbs carbon dioxide

High-efficiency Low energy - removal, storage and reuse of CO2

 

 GIST research team developed technology that can capture and store CO2 reversibly in quantitative manner at room temperature.

 

 GIST (Gwangju Institute of Science and Technology, president Jung-Ho SONU) announced that Ji-Woong Park, 45, a professor of the department of materials science and engineering and Myung-Sook Kim, 29, a Ph. D. student developed a new hydroxylated amidine derivative that forms salt as it reacts even in the solid state to CO2 in quantitative manner without moisture or other additives.

 

This compound absorbs carbon dioxide up to about 27% in comparison with its mass. When it is heated at more than 60 degrees, it releases CO2 as gas.

 

CO2 emitted into the atmosphere is a culprit of global warming so many studies are under way for carbon dioxide separation and recovery. Alkanolamine absorbent that is widely used in CO2 absorption process reacts to CO2 fast but it needs high amount of renewable energy due to specific heat of water that comprises much of the absorbent. Also it has a weak point in corrosion and loss.

 

Furthermore, by products or solvents can come out as impurities in recovery process. Therefore, these are removed in order to regenerate pure CO2 so it"s hard to use the absorbent as CO2 storage nor can it be used in removing CO2 of gas fuel.

 

 

Hydroxylated amidine derivative that the team developed tackles all these problems so it is easy to use commercially. 

 

Without adding moisture in capturing CO2, it can desorb in low temperature. So, it consumes less energy. As the process of CO2 capture and release is clean, it can be used in removing impurities of gas fuel or CO2 released in closed space such as submarines, airplanes and spacecrafts. Also, it can be a source of CO2 in the solid state in quantitative way in the process of reusing CO2.

  

The paper of professor Park is published in a recent online issue, Advance Articles, of Chemical Communications, a prominent international academic journal published by Royal Society of Chemistry. Myung-Sook Kim who conducted this research also earned a prize in 16th human tech paper hosted by Samsung Electronics thanks to this research.

 

 

 Professor Ji-Woong Park   Myung-Sook Kim, Ph. D. student

 

*논문제목 : 수산화 아미딘의 고체상, 가역적 이산화탄소 포집 (Reversible, Solid State Capture of Carbon Dioxide by Hydroxylated Amidines)

* 웹주소: http://www.rsc.org/Publishing/Journals/CC/article.asp?doi=b921688j

 

□ Pictures

1. Hydroxylated amidine derivative that absorbs carbon dioxide in quantitative manner without moisture or other additives.

 

 

 

Hydroxylated amidine derivative captures CO2 in a condition without water or other additives when dry CO2 is bubbling in hydroxylated amidine derivative (DBUOH), and yields organic carbonate which releases CO2 quantitatively above 60 degrees and returns to hydroxylated amidine derivative.

This means hydroxylated amidine derivative can be repeatedly used and also become a source of CO2 in synthesis as CO2 capture and release cycle has a characteristic of equivalent response.

 

2. CO2 quantitative capture and release by hydroxylated amidine derivative fixed in porous support

Hydroxylated amidine derivative was combined with porous silica particle, making an absorbent. Then CO2 capture and release experiment was carried out.

 

It showed that there was little loss of absorbent in measuring various cycles and confirmed that it has certain absorption ability. This hydroxylated amidine derivative can be applied in filters that remove CO2 in gas.