Temperature-swing gas separation with electrothermal desorption step
TL;DR: In this article, an experimental investigation of a new method for heating adsorbent beds in the desorption step owing to Joule's heat generated inside the adorbent particles by passing an electric current through them is presented.
Abstract: Results of an experimental investigation of a new method for heating adsorbent beds in the desorption step owing to Joule's heat generated inside the adsorbent particles by passing an electric current through them are presented. Desorption of a previously saturated bed and cyclic separation with the electric potential applied to a fibrous activated carbon bed was performed.
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TL;DR: In this paper, novel structured adsorbents for gas separation processes are discussed and general requirements are elucidated and illustrated with respect to specific structures such as monoliths, foams, laminates, and fabric structures.
224 citations
TL;DR: In this article, the authors summarized main parameters governing electrochemical pH-swing processes and put the concept in the framework of available worldwide capture technologies, and provided recommendations for further improvements.
Abstract: Electrochemical CO2 capture technologies are gaining attention due to their flexibility, their ability to address decentralized emissions (e.g., ocean and atmosphere) and their fit in an electrified industry. In the present work, recent progress made in electrochemical CO2 capture is reviewed. The majority of these methods rely on the concept of “pH-swing” and the effect it has on the CO2 hydration/dehydration equilibrium. Through a pH-swing, CO2 can be captured and recovered by shifting the pH of a working fluid between acidic and basic pH. Such swing can be applied electrochemically through electrolysis, bipolar membrane electrodialysis, reversible redox reactions and capacitive deionization. In this review, we summarize main parameters governing these electrochemical pH-swing processes and put the concept in the framework of available worldwide capture technologies. We analyse the energy efficiency and consumption of such systems, and provide recommendations for further improvements. Although electrochemical CO2 capture technologies are rather costly compared to the amine based capture, they can be particularly interesting if more affordable renewable electricity and materials (e.g., electrode and membranes) become widely available. Furthermore, electrochemical methods have the ability to (directly) convert the captured CO2 to value added chemicals and fuels, and hence prepare for a fully electrified circular carbon economy.
148 citations
TL;DR: In this article, a review of post-combustion capture techniques, including thermal or pressure swing principles, adsorption or absorption, and electrical swing or membrane separation processes, is presented.
Abstract: CCS, Carbon Capture and Storage, is considered a promising technology to abate CO2 emissions from point sources. The present review deals with the principle of post-combustion capture techniques, including thermal or pressure swing principles, adsorption or absorption, and electrical swing or membrane separation processes. Opportunities and challenges are assessed. In the first section of absorption processes, several commercial technologies are compared and complemented by the aqueous or chilled ammonia (NH3) process, and a dual or strong alkali absorption. The second section deals with adsorption where fixed beds, circulating fluidized beds and counter-current bed configurations will be discussed, with particular focus on the different adsorbents ranging from zeolites or activated carbon, to more complex amine-functionalized adsorbents, nanotubes or metal organic frameworks (MOFs), and alkali-promoted oxides. Thirdly, membrane processes will be analysed. The review will finally summarize challenges and opportunities. Several research groups confirmed that absorption is the most mature post-combustion capture process: among the assessment of post-combustion CCS, 57% apply absorption, 14% rely on adsorption, 8% use membranes, and 21% apply mineralization or bio-fixation. This conclusion was in-line with expectations since absorption gas separation has been largely applied in various petrochemical industries. All other systems need further development prior to large scale application.
141 citations
TL;DR: In this paper, a comparison of different methods of desorption by heating, purge and/or vacuum is performed with a 5A zeolite on a small laboratory column with heating from the wall.
130 citations
TL;DR: In this paper, an activated carbon honeycomb monolith with low electrical resistivity was employed as selective adsorbent for carbon capture for low molar fractions of CO2 in the flue gas streams.
121 citations
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