1 when actually applied to absorbing SO2 in flue gas, will organic amines that only contain tertiary amines really not interact with CO2? Like methylated polyethyleneimine and triethanolamine.
2How to avoid the adsorption of CO2 by amine functionalized adsorbents (only adsorbs SO2)?
3 Loading organic amines containing only tertiary amines to porous materials and applying them to flue gas capture after desulfurization and denitrification in power plants, can this composite adsorbent achieve highly selective capture of SO2?
4 If this organic amine is used to completely occupy the pore volume of the porous material, can it be recognized that the adsorbent will not physically adsorb CO2?
Tertiary amines will react with CO2 if water is present, making a bicarbonate salt.
CO2 + NR3 + H2O = [R3NH][HCO3]
However, if water is absent and there are no other related chemicals present like an alcohol or primary/secondary amine (i.e. any N-H, S-H or O-H bond into which CO2 could insert itself), then a tertiary amine will mostly ignore CO2. I say "mostly" because there is a weak interaction between the tertiary amine lone pair and the carbon atom in CO2 that can be detected spectroscopically, but it's not such a strong interaction that you could isolate the amine:CO2 adduct as a product.
Yeah, to follow up on Jessop(an expert in this area), there are known tertiary amine-SO2 adducts that are more stable than tertiaryamine CO2 adducts.
See for example DABSO: Article DABCO-Bis(sulfur dioxide), DABSO, as a Convenient Source of ...
So, SO2 is going to bind much more strongly in the presence of CO2. If it's got lots of water around it might do the chem that Jessop pointed out, but it will depend on relative reaction thermodynamics of that vs. SO2 binding. Perhaps there is DFT on this? (Or I can whip up some calcs on it if you want)
Kyle
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