The method is based on a recyclable filtration fluid consisting of a superbase-alcohol compound. One gram of the new compound can absorb 156 milligrams of carbon dioxide.
A new method to capture carbon dioxide from the air has been developed at the University of Helsinki's chemistry department.
The method developed by Postdoctoral Researcher is based on a compound of superbase and alcohol. Tests done in professor group show that the compound appears promising: one gram of the compound can absorb 156 milligrams of carbon dioxide directly from untreated ambient air. However, the compound does not react with nitrogen, oxygen or other atmospheric gases. Capasity clearly outperforms the CO2 capture methods currently in use.
The CO2 captured by the compound can be released by heating the compound at 70 °C in 30 minutes. Clean CO2 is recovered and can be recycled.
The ease of releasing CO2 is the key advantage of the new compound. In current compounds, releasing CO2 typically requires heat above 900 degrees Celsius.
- In addition, the compound can be used multiple times: the compound retained 75 percent of its original capacity after 50 cycles, and 50 percent after 100 cycles.
Non-toxic and cost-effective
The new compound was discovered by experimenting with a number of bases in different compounds, says Eshagi Gorji. The experiments lasted more than a year in total.
The most promising base proved to be 1,5,7-triazabicyclo [4.3.0] non-6-ene (TBN), developed at in the professor group, which was combined with benzyl alcohol to produce the final compound.
- None of the components is expensive to produce, Eshaghi Gorji points out. In addition, the fluid is non-toxic.
The compound will now be tested in pilot plants at a near-industrial scale, rather than in grams. A solid version of the liquid compound must be made for this purpose.
- The idea is to bind the compound to compounds such as silica and graphene oxide, which promotes the interaction with carbon dioxide.
