CO2 regeneration performance enhancement by nanoabsorbents for energy conversion application

A Review on Enhancing Solvent Regeneration in CO2 Absorption Process Using Nanoparticles

“…The physical enhancement mechanisms by nanoparticles on solvent regeneration include activation energy, surface effect and thermal conductivity enhancement effect [57][58][59][60]. The activation energy effect was proposed by Lee et al [59] in 2015.…”

“…The utilization of γ-Al 2 O 3 in 5M MEA was able to allow the reduction of the regeneration temperature from 120-140 • C to 90-95 • C and decrease the regeneration energy requirement by 27%. Table 5 depicts the summary of the past studies on the utilization of Al 2 O 3 nanoparticles in solvent regeneration [58][59][60]100], for the nanoparticles ranging from 15-45 nm. It was reported that a larger nanoparticle has a higher number of regeneration sites of 19 at 45 nm, followed by 15 sites at 20 nm and finally just 8 sites for the base solvent methanol that was used in the study.…”

“…When the size of the nanoparticles was smaller than the surface roughness, the roughness decreased. However, when the size was larger than the surface roughness, then the nucleation site density became larger [58]. Apart from the nanoparticle powder size, its cluster size is also important, as it reflects the nanoparticle's stability.…”

“…The SiO 2 nanoparticle concentration is kept low at 0.01-0.1 vol% [58][59][60]100]. Higher concentrations of the nanoparticle lead to the increase in the viscosity of the solvent.…”

Hollow Fiber Membrane Contactors in CO2 Desorption: A Review

“…The use of nanofluids enhanced the desorption performance by approximately 10-20% in all cases; J.H. Lee et al 150 proposed that the morphological change by the nanoparticles during the CO2 regeneration process is the most influential mechanism of the regeneration performance improvement;…”