Phosphorous dendrimer bound polyethyleneimine as solid sorbents for post-combustion CO2 capture

Abstract High capacity solid amine sorbents for CO 2 adsorption were prepared via a cross-linking reaction between polyaldehyde phosphorous dendrimers and polyethyleneimines (PEIs). The best performing sorbent achieves an average CO 2 capacity of 13.1 wt% through 350 cycles of adsorption/desorption over 700 contiguous hours from simulated flue gas conditions (CO 2 , O 2 , H 2 O, and N 2 ). The adsorption operates with relatively high capacities and rapid kinetics between 25 and 85 °C, reaching 90% capacity within the first 10 min of exposure at 65 °C. The capture of CO 2 in the presence of common acid gas contaminants (SO 2 , NO, and NO 2 ) and from sour gas (10,000 ppm H 2 S) was also demonstrated. The heat of adsorption and other physical properties (e.g. surface area, pore volume, and SEM) were measured and disclosed.