Abstract
We report on a simple electrochemical system able to capture gaseous carbon dioxide from a gas mixture and convert it into syngas. The capture/release module is implemented via regeneration of NaOH and acidification of NaHCO3 inside a four-chamber electrochemical flow cell employing Pt foils as catalysts, while the conversion is carried out by a coupled reactor that performs electrochemical reduction of carbon dioxide using ZnO as a catalyst and KHCO3 as an electrolyte. The capture module is optimized such that, powered by a current density of 100 mA/cm2, from a mixture of the CO2–N2 gas stream, a pure and stable CO2 outlet flow of 4–5 mL/min is obtained. The conversion module is able to convert the carbon dioxide into a mixture of gaseous CO and H2 (syngas) with a selectivity for the carbon monoxide of 56%. This represents the first all-electrochemical system for carbon dioxide capture and conversion.
Highlights
In the last decades, the problem of the global warming has gained the attention of the research community
We report on a simple electrochemical system able to capture gaseous carbon dioxide from a gas mixture and convert it into syngas
The capture/release module is implemented via regeneration of NaOH and acidification of NaHCO3 inside a four-chamber electrochemical flow cell employing Pt foils as catalysts, while the conversion is carried out by a coupled reactor that performs electrochemical reduction of carbon dioxide using ZnO as a catalyst and KHCO3 as an electrolyte
Summary
The problem of the global warming has gained the attention of the research community. The dual functional materials consist of Ru as methanation catalyst and nano-dispersed CaO as CO2 adsorbent, both supported on a porous γ-Al2O3 carrier In this way, the capture and utilization occur inside the same reactor operating at a temperature of 320 ◦C, possibly using heat recovered by the flue gas. An electrochemical reactor receiving as inlet pure carbon dioxide, provides syngas as output [14] This solution, composed by the coupling of two simple electrochemical systems, avoids high temperature and toxic substances, so reducing the energy consumption and making this system a suitable green and low-cost possibility for flue gas conversion
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