Investigation Of Catalytic Sorbents For Capture And Conversion Of CO2 To Methane
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Park, Sang Jae
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Abstract
The goal of this thesis is to develop dual function materials (DFM), or a catalytic sorbent, that has higher CO2 sorption and CO2 hydrogenation (methanation) capacities than currently existing materials and study fundamentals of CO2 methanation over the synthesized catalytic sorbents. In the first objective, NaNO3 promoted MgO was synthesized and its capability as a sorbent material for integrated capture and conversion application was evaluated. The CO2 sorption mechanism was explored using in-situ XRD and in-situ FTIR measurements, and isothermal regeneration of the sorbent was performed using the new sorbent. In the second objective, integrated capture and conversion was performed using a catalytic sorbent comprised of NaNO3/MgO + Ru/Al2O3. Higher sorption and methane production capacity were obtained, and the CO2 methanation reaction pathway was investigated over the 1% Ru/Al2O3 catalyst and 5% NaNO3/1%Ru/Al2O3 catalyst as well. In the last objective, in depth mechanistic study was performed using operando FTIR and steady state isotopic transient kinetic analysis (SSITKA) to observe the effect of loading of Ru and the presence of NaNO3 on the CO2 methanation reaction mechanism over Ru/Al2O3 catalysts. This research provides more effective catalytic sorbents than previously studied materials in integrated capture and conversion applications, and reveals underlying mechanism(s) of CO2 methanation over the synthesized materials.
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2021-08-26
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Dissertation