Carbon dioxide (CO2) capture is an important strategy to mitigate greenhouse gas emissions and reduce global warming effects. This study synthesizes two nanomaterials, Ce-doped Ni-Al mixed metal oxide (CNAO) and Mn-doped Ni-Al mixed metal oxide (MNAO), from Mn- and Ce-doped Ni-Al-layered double hydroxides using a co-precipitation method followed by a calcination process. The materials are characterized using various techniques, such as High-resolution transmission electron microscopy-energy dispersive x-ray spectroscopy/selected area electron dispersion (HRTEM-EDS/SAED), X-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET), and attenuated total reflection Fourier transform infrared (ATR FT-IR). The CO2 adsorption performance of the materials is evaluated using packed-bed column experiments at the testing conditions of 13 vol% +/- 1 vol% CO2 in N-2 simulated flue gas, flow rate of 20 mL min-1, inlet pressure of 14.15 +/- 0.1 psi, and temperature of 31 C-degrees +/- 2 C-degrees. The results show that both CNAO and MNAO are promising nanomaterials for CO2 capture applications due to their high CO2 adsorption capacity and efficiency. CNAO has a higher saturation capacity of 11.4 mmol g(-1) and a longer breakthrough time than MNAO, which has a saturation capacity of 10.0 mmol g(-1). The doping of Ce and Mn enhances the CO2 adsorption capacity of the materials compared to the un-doped Ni-Al mixed oxide. The mechanisms of CO2 adsorption are mainly linearly adsorbed CO2, bidentate, and monodentate or bulk carbonate formation, as revealed by ATR FT-IR analysis. The regeneration performance results suggest that CNAO is more stable than MNAO under multiple regeneration cycles and more promising material for large-scale CO2 capture applications.

Breakthrough Study of CO2 Adsorption and Regeneration Performance of Mn‐ and Ce‐Doped Ni–Al Layered Double Hydroxides Derived Mixed Oxides in Packed‐Bed Column

Shifa, Tofik A.
;
2024-01-01

Abstract

Carbon dioxide (CO2) capture is an important strategy to mitigate greenhouse gas emissions and reduce global warming effects. This study synthesizes two nanomaterials, Ce-doped Ni-Al mixed metal oxide (CNAO) and Mn-doped Ni-Al mixed metal oxide (MNAO), from Mn- and Ce-doped Ni-Al-layered double hydroxides using a co-precipitation method followed by a calcination process. The materials are characterized using various techniques, such as High-resolution transmission electron microscopy-energy dispersive x-ray spectroscopy/selected area electron dispersion (HRTEM-EDS/SAED), X-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET), and attenuated total reflection Fourier transform infrared (ATR FT-IR). The CO2 adsorption performance of the materials is evaluated using packed-bed column experiments at the testing conditions of 13 vol% +/- 1 vol% CO2 in N-2 simulated flue gas, flow rate of 20 mL min-1, inlet pressure of 14.15 +/- 0.1 psi, and temperature of 31 C-degrees +/- 2 C-degrees. The results show that both CNAO and MNAO are promising nanomaterials for CO2 capture applications due to their high CO2 adsorption capacity and efficiency. CNAO has a higher saturation capacity of 11.4 mmol g(-1) and a longer breakthrough time than MNAO, which has a saturation capacity of 10.0 mmol g(-1). The doping of Ce and Mn enhances the CO2 adsorption capacity of the materials compared to the un-doped Ni-Al mixed oxide. The mechanisms of CO2 adsorption are mainly linearly adsorbed CO2, bidentate, and monodentate or bulk carbonate formation, as revealed by ATR FT-IR analysis. The regeneration performance results suggest that CNAO is more stable than MNAO under multiple regeneration cycles and more promising material for large-scale CO2 capture applications.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10278/5083021
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