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

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 degrees 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 030 wt.%.h(-1) at 130 degrees 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. (C) 2018 Elsevier Ltd. All rights reserved.