Abstract
Amine-based absorption has matured into an established technology for CO2 capture from fossil fuel power plants. However, high energy consumption for CO2 desorption remains a challenge. Herein, we report a promising integration of a solid acid catalyst (i.e., HZSM-5) filled into a vapor permeable-liquid impermeable tubular α-Al2O3 ceramic membrane for boosting CO2 desorption from aqueous monoethanolamine (MEA) solution. Experiments were conducted to investigate the effects of catalyst weight, temperature, pressure, liquid flow rate and CO2 loading on CO2 desorption rate and energy consumption. Furthermore, 60 runs of cyclic tests were carried out to assess the stable CO2 desorption rate and the thermal and chemical stability of both the HZSM-5 catalyst and the α-Al2O3 membrane. The experiment results demonstrated that the HZSM-5 filled α-Al2O3 ceramic membrane contactor exhibited high CO2 desorption performance and long-term stability. It is anticipated that integration of solid acid catalyst with porous ceramic membrane holds great promise in practical application to boost the CO2 desorption rate and reduce the energy requirement.
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