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Title: Fundamental research on gas–solid reaction between CO{sub 2} and Li{sub 2}CuO{sub 2} linking application for solid CO{sub 2} absorbent

We compared reactivity between CO{sub 2} and Li{sub 2}CuO{sub 2} with that between CO{sub 2} and Li{sub 4}SiO{sub 4} by using XRD, SEM observation, and thermogravimetry in order to study fundamentally a potential of Li{sub 2}CuO{sub 2} oxide for application to solid CO{sub 2} absorbents. The CO{sub 2} absorption ability of Li{sub 2}CuO{sub 2} was examined by measuring rate constants for the gas–solid reaction between perfectly single-phase Li{sub 2}CuO{sub 2} and CO{sub 2} at various temperatures in 100 vol% CO{sub 2} atmosphere using the rate theory with thermogravimetry using rapid heating. The measured rate constants were compared with those reported previously for Li{sub 4}SiO{sub 4} at various temperatures. Almost no difference was found between these rate constants of Li{sub 2}CuO{sub 2} and Li{sub 4}SiO{sub 4} at temperatures less than 660 °C, but at temperatures higher than 670 °C, the rate constants of Li{sub 2}CuO{sub 2} were greater than those of Li{sub 4}SiO{sub 4}. These results demonstrate that Li{sub 2}CuO{sub 2} can outstrip the ability of Li{sub 4}SiO{sub 4} to absorb CO{sub 2}. Moreover, different from Li{sub 4}SiO{sub 4}, the CO{sub 2} absorption ability of Li{sub 2}CuO{sub 2} decays only slightly, even if the atmospheric CO{sub 2} concentration decreases. -- Graphicalmore » abstract: Surface changes of Li{sub 2}CuO{sub 2} and Li{sub 4}SiO{sub 4} particles by progression of the gas–solid reactions between CO{sub 2} and these oxides. Highlights: • The CO{sub 2} absorption ability of perfect single-phase Li{sub 2}CuO{sub 2} is reported. • Results show that Li{sub 2}CuO{sub 2} can outstrip the Li{sub 4}SiO{sub 4} ability to absorb CO{sub 2}. • The oxide particle CO{sub 2} absorption ability is size- and surface-state-dependent.« less
Authors:
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Publication Date:
OSTI Identifier:
22275861
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 211; Journal Issue: Complete; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORBENTS; ABSORPTION; CARBON DIOXIDE; CUPRATES; DIFFUSION; LITHIUM SILICATES; PARTICLES; REACTION KINETICS; SCANNING ELECTRON MICROSCOPY; SOLIDS; THERMAL GRAVIMETRIC ANALYSIS; X-RAY DIFFRACTION