Polyallylamine (PAA), comprising only primary amines, was combined with SBA-15 and mesocellular siliceous foam (MCF) type mesoporous silicas to prepare solid amine composites as adsorbents for the post combustion capture (PCC) of CO2 from flue gas. Primary only type amine sorbents are of interest since secondary amines, such as those present in polyethyleneimine, are reportedly less stable against oxidative degradation. Primary amines are also known to be more reactive to CO2and exhibit higher heats of adsorption than secondary amines analogues.Sorbents and supports were characterized by helium pycnometry, N2 adsorption/desorption (77K), thermogravimetric analyses (TGA) of their combustion, and also by their TGA response to isothermal (378-423K) CO2 partial pressure swings. Solid PAA sorbents were prepared with up to 17.5 wt% N loading and up to 11 wt% CO2 capacity (in 50% CO2/50% Ar at 398K). The sorbents' capacities for CO2 were found to decrease with increasing temperature, whereas their sorption kinetics improved. Circa 408K was identified as a promising regime for CO2 capture by vacuum swing adsorption.

Polyallylamine-silica composites for CO<sub>2</sub> capture via adsorption

246th National Meeting (2013)

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Polyallylamine-silica composites for CO2 capture via adsorption

Polyallylamine-silica composites for CO₂ capture via adsorption