Enhanced CO[sub.2] Capture by Sorption on Electrospun Poly

Poly(methyl methacrylate) (PMMA) is characterized by high CO[sub.2] capture yield under mild pressures and temperatures. A morphological modification of powdery amorphous PMMA (pPMMA) is carried out by electrospinning to increase the surface/volume ratio of the resulting electrospun PMMAs (ePMMAs). This modification improves the kinetics and the capture yields. The rate constants observed for ePMMAs are two to three times higher than those for pPMMA, reaching 90% saturation values within 5–7 s. The amount of sorbed CO[sub.2] is up to eleven times higher for ePMMAs at 1 °C, and the highest difference in captured CO[sub.2] amount is observed at the lowest tested pressure of 1 MPa. The operating life of the ePMMAs shows a 5% yield loss after ten consecutive runs, indicating good durability. Spent electrospun PMMAs after several cycles of CO[sub.2] sorption-desorption can be regenerated by melting and again electrospinning the molten mass, resulting in a CO[sub.2] capture performance that is undistinguishable from that observed with fresh ePMMA. Scanning electron and atomic force microscopies show a reduction in surface roughness after gas exposure, possibly due to the plasticization effect of CO[sub.2] . This study shows the potential of electrospun PMMAs as solid sorbents for carbon capture from natural gas or pre-combustion and oxyfuel combustion processes.