Basalt toward energy-efficient CO2 capture by MEA solution
Monoethanolamine(MEA)has been widely used as a CO2 absorbent in flue gas CO2 capture,but the high energy consumption of CO2 regeneration has brought huge economic challenges to the large-scale development of this technology.Adding a solid catalyst to the absorbent can reduce the energy barrier of the regeneration reaction and increase the CO2 desorption rate,ultimately achieving rapid desorption at lower temperatures.This paper used natural mineral nano basalt as a catalyst to enhance the CO2 capture performance of MEA solution.Firstly,the differences of CO2 absorption and desorption performances between the addition of basalt and the blank experiment were compared.Then the physical and chemical properties of the basalt catalytic reaction process were explored using characterization techniques such as X-ray Diffraction(XRD),X-ray Photoelectron Spectroscopy(XPS),Fourier Transform-Infrared Spectroscopy(FTIR),N2 Temperature-Programmed Desorption(N2-TPD),Pyridine Adsorption-Infrared Spectrometry(Py-IR),and NH3 Temperature-Programmed Desorption(NH3-TPD).Finally,the catalytic mechanism of basalt in the MEA solution was proposed.The experimental results showed that basalt rock powder had the ability to provide protons and accept electrons with the presence of Brønsted acid sites,Lewis acid sites and Lewis base sites on its surface.Under 100℃ conditions,compared with the blank experiment,its CO2 cyclic absorption capacity increased by 5.0％,CO2 desorption rate increased by 76.5％,and sensible heat decreased by 11.9％.Therefore,basalt rock powder can be used as a composite catalyst for CO2 capture improvement in MEA solution.
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