Science Daily August 5, 2022
A team of researchers in the US (UC Berkely, Stanford University, Texas A&M) has demonstrated new sustainable, solid-state, polyamine-appended, cyanuric acid–stabilized melamine nano porous networks (MNNs) via dynamic combinatorial chemistry (DCC) at the kilogram scale toward effective and high-capacity carbon dioxide capture. Polyamine-appended MNNs reaction mechanisms with carbon dioxide were elucidated with double-level DCC where two-dimensional heteronuclear chemical shift correlation nuclear magnetic resonance spectroscopy was performed to demonstrate the interatomic interactions. They distinguished ammonium carbamate pairs and a mix of ammonium carbamate and carbamic acid during carbon dioxide chemisorption. The coordination of polyamine and cyanuric acid modification endows MNNs with high adsorption capacity (1.82 millimoles per gram at 1 bar), fast adsorption time (less than 1 minute), low price, and extraordinary stability to cycling by flue gas. The work creates a general industrialization method toward carbon dioxide capture via DCC atomic-level design strategies…read more. Open Access TECHNICAL ARTICLEÂ
Demonstration of the dynamic combinatorial species in MNNsCya ⊃ DETA by solid-state NMR… Credit: SCIENCE ADVANCES, 3 Aug 2022, Vol 8, Issue 31