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Preparation and performance of amine-based polyacrylamide composite beads for CO2 capture

Nie, Lijuan, Jin, Junsu, Chen, Jian, Mi, Jianguo
Energy 2018 v.161 pp. 60-69
adsorbents, adsorption, carbon dioxide, desorption, energy, ethyleneimine, fluidized beds, heat recovery, polyacrylamide, polymerization
The macropore composite beads were prepared as CO2 adsorbent by polymerization of polyacrylamide and impregnation of 1,2-epoxyhexane functionalized poly(ethyleneimine). The consecutive CO2 adsorption-desorption tests were performed at 1 bar in the range of 50–125 °C. The time required to achieve 90% CO2 uptake (2.64 mmol·g⁻¹) is less than 10 min, and 90% CO2 desorption can be realized within 11 min. After 50 cycles of adsorption-desorption, the adsorption capacity declines 9.2 wt.%. According to the adsorption-desorption thermodynamics without consideration of the heat recovery, the calculated regeneration heat is 2.2 MJ·kg⁻¹(CO2). The attrition resistance of the spherical beads was tested in a bubbling fluidized-bed reactor, and the attrition ratio is 0.30 wt.%·h⁻¹ at 130 °C. These results indicate that the synthesized adsorbent possesses high adsorption efficiency, low desorption energy, and good attrition resistance performance, showing good application prospects for CO2 capture in fluidized-bed reactors.