This group created a MOF called MOF-808 that was too facile and the regeneration process too energy intensive to be commercially usable. The new molecule this time is called COF-999.
Two years ago, his lab created a very promising material, MOF-808, that adsorbs CO2, but the researchers found that after hundreds of cycles of adsorption and desorption, the MOFs broke down. These MOFs were decorated inside with amines (NH2 groups), which efficiently bind CO2 and are a common component of carbon capture materials. In fact, the dominant carbon capture method involves bubbling exhaust gases through liquid amines that capture the carbon dioxide. Yaghi noted, however, that the energy intensive regeneration and volatility of liquid amines hinders their further industrialization.
Working with colleagues, Yaghi discovered why some MOFs degrade for DAC applications â" they are unstable under basic, as opposed to acidic, conditions, and amines are bases. He and Zhou worked with colleagues in Germany and Chicago to design a stronger material, which they call COF-999. Whereas MOFs are held together by metal atoms, COFs are held together by covalent carbon-carbon and carbon-nitrogen double bonds, among the strongest chemical bonds in nature.