Abstract
Development of sustainable energy technologies and reduction of carbon dioxide in the atmosphere are the two effective strategies in dealing with current environmental issues. Herein we report a Dual Function Material (DFM) consisting of supported sodium carbonate in intimate contact with dispersed Ru as a promising catalytic solution for combining both approaches. The Ru-Na2CO3 DFM deposited on Al2O3 captures CO2 from a flue gas and catalytically converts it to synthetic natural gas (i.e., methane) using H2 generated from renewable sources. The Ru in the DFM, in combination with H2, catalytically hydrogenates both adsorbed CO2 and the bulk Na2CO3, forming methane. The depleted sites adsorb CO2 through a carbonate reformation process and in addition adsorb CO2 on its surface. This material functions well in O2- and H2O-containing flue gas where the favorable Ru redox property allows RuOx, formed during flue gas exposure, to be reduced during the hydrogenation cycle. As a combined CO2 capture and utilization scheme, this technology overcomes many of the limitations of the conventional liquid amine-based CO2 sorbent technology.
Highlights
As predicted by the Intergovernmental Panel on Climate Change (IPCC), carbon dioxide in the atmosphere may reach 570 ppmv by the year of 2100, accompanied by a rise in the mean global temperature of 1.9 ◦ C and mean sea level by 38 cm [1,2,3]
The material used for this process is composed of a nano-dispersed [24] alkaline component in intimate contact with Ru on a high surface area carrier (Al2 O3 ), referred to as a Dual Function Material (DFM)
We have demonstrated that a DFM, containing 5% Ru, 10% Na2 CO3 /Al2 O3, captures CO2 both on the carbonate surface and depleted bulk carbonate sites, which are subsequently hydrogenated to
Summary
As predicted by the Intergovernmental Panel on Climate Change (IPCC), carbon dioxide in the atmosphere may reach 570 ppmv by the year of 2100, accompanied by a rise in the mean global temperature of 1.9 ◦ C and mean sea level by 38 cm [1,2,3]. The material used for this process is composed of a nano-dispersed [24] alkaline component in intimate contact with Ru on a high surface area carrier (Al2 O3 ), referred to as a Dual Function Material (DFM) It adsorbs CO2 on its alkaline component and catalytically converts it to synthetic natural gas (i.e., CH4 ) in the subsequent step over the Ru catalyst approaching a closed loop for carbon utilization. In a typical implementation of this material, the methane produced is dried and compressed and recycled to the inlet of the power plant or integrated into the natural gas grid, ideally closing the carbon cycle This material provides an additional source of sites for CO2 capture by carbonate reformation, yielding an increase in subsequent methane production.
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