In
this study, three different nanoparticlesSiO2,
TiO2, and Al2O3were employed
to enhance the CO2 gas absorption by monoethanolamine (MEA)
solvent. It is observed that, with increased solids loading, the total
mass-transfer enhancement has a tendency to be dominated by the bubble
breaking effect. It is concluded that nanoparticles result in an increased
CO2 absorption rate of >10%. On the other hand, nanoparticles
exhibit much more attractive impact on CO2 desorption.
Under the same desorption extent, solvent with 0.1 wt % TiO2 nanoparticles saved 42% desorption time, compared to that
without nanoparticles. Under higher heat flux density, more input
heat would be supplied to the heat of desorption, rather than the
heat of water evaporation, which is due to the enhancement of desorption
rate by nanoparticles. The issue of particle aggregation was also
investigated by analyzing the size distribution of nanoparticle clusters
and zeta potential of MEA solvents.
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