Screening of Metal Oxides to Promote CO₂ Adsorption Performance over Polyethyleneimine Incorporated Solid Adsorbents

Abstract:

Amine-modified solid sorbents have attracted extensive interests in post-combustion carbon capture for power plants. Among various amines, polyethyleneiemine (PEI) is likely to be the most effective and promising candidate. However, previous studies have mainly focused on examining various supports to increase PEI loading and then enhance CO₂ adsorption capacity. In this study, one rare earth element (Ce) and 6 first-row transition metals (from V to Cu) in the oxidation states impregnated on PEI incorporated γ-Al₂O₃ were prepared and investigated as potential catalyst/promotor for base-catalyzed reaction. Thermodynamic analysis, including isothermal and quasi-static CO₂ adsorption tests, were implemented to evaluate the performances amongst the 7 metal oxides. The results showed that MnO₂, CeO₂ and Fe₂O₃ showed a better performance in isothermal CO₂ adsorption at 75°C. Upon quasi-static tests, the results also indicates that the peak adsorption temperatures (T_{peak, a}) of V₂O₅ and Cr₂O₃ shifted to high temperature region, whilst opposite behavior of MnO₂ was observed. In preliminary study, density functional theory (DFT) was also adopted to assist the screening of metal oxide in terms of bond length and adsorption energies.

• Periodical: Materials Science Forum (Volume 1005)
• Pages: 93-100
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1005.93
• Online since: August 2020
• Authors: Yang Meng*, Xin Yun Wu, Yu Xin Yan, Shuai Liu, Tao Wu, Cheng Heng Pang
• Keywords: Carbon Capture, Metal Oxides, Polyethyleneimine, Thermodynamic Analysis

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