Good question. I was also suspicious of the angle/framing of the paper as a smokestack capture solution. My thoughts are 1. smokestacks are a great place to st

Good question. I was also suspicious of the angle/framing of the paper as a smokestack capture solution. My thoughts are 1. smokestacks are a great place to start, it's thermodynamically easier, has low-hanging fruit, and can be a stepping stone to a atmospheric DAC solution. 2. I bet that the smokestack angle of the paper is due to ALF being a decent oxygen absorber. The paper made the argument that the CO2 (diameter 330pm) vs. N2 (diameter 364pm) selectivity was due to size exclusion principles. But oxygen has diameter 346pm, much closer to CO2, so it would stand to reason that oxygen would compete for CO2 binding efficiency. If you read the supplementary materials/experimental conditions, literally every experiment is done under a protective flow of 99.95% N2 gas, indicating that this compound is not to be exposed to air.