Carbon dioxide sequestration by ex-situ mineral carbonation
The process developed for carbon dioxide sequestration utilizes a slurry of water mixed with olivine- forsterite end member (Mg{sub 2}SiO{sub 4}), which is reacted with supercritical CO{sub 2} to produce magnesite (MgCO{sub 3}). Carbon dioxide is dissolved in water to form carbonic acid, which likel...
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ftunivnotexas:info:ark/67531/metadc877629 2023-05-15T15:52:33+02:00 Carbon dioxide sequestration by ex-situ mineral carbonation O'Connor, W. K. Dahlin, D. C. Turner, P. C. Walters, R. United States. Office of Fossil Energy. 2000-01-01 115-124 Text https://digital.library.unt.edu/ark:/67531/metadc877629/ English eng Cognizant Communication Corporation, 3 Hartsdale Road, Elmsford, NY 10523 Albany Research Center (United States. Bureau of Mines) rep-no: DOE/ARC-1999-009 osti: 875354 https://digital.library.unt.edu/ark:/67531/metadc877629/ ark: ark:/67531/metadc877629 Second International Dixy Lee Ray Memorial Symposium, Washington, DC, Aug. 29 - Sept. 2, 1999 Partial Pressure Silicate Minerals Carbon Dioxide Water Carbon Dioxide Sequestration Mineral Carbonation 37 Inorganic Organic Physical And Analytical Chemistry 36 Materials Science Kinetics 58 Geosciences Reaction Kinetics Carbonic Acid Carbon Dioxide Sequestration Carbonates Catalysis Olivine Cations Ambient Temperature Stirring Article 2000 ftunivnotexas 2021-06-12T22:08:01Z The process developed for carbon dioxide sequestration utilizes a slurry of water mixed with olivine- forsterite end member (Mg{sub 2}SiO{sub 4}), which is reacted with supercritical CO{sub 2} to produce magnesite (MgCO{sub 3}). Carbon dioxide is dissolved in water to form carbonic acid, which likely dissociates to H{sup +} and HCO{sub 3}{sup -}. The H{sup +} hydrolyzes the silicate mineral, freeing the cation (Mg{sup 2+}), which reacts with the HCO{sub 3}{sup -} to form the solid carbonate. Results of the baseline tests, conducted on ground products of the natural mineral, have demonstrated that the kinetics of the reaction are slow at ambient temperature (22 degrees C) and subcritical CO{sub 2} pressures (below 7.4 MPa). However, at elevated temperature and pressure, coupled with continuous stirring of the slurry and gas dispersion within the water column, significant conversion to the carbonate occurs. Extent of reaction is roughly 90% within 24 h, at 185 degrees C and partial pressure of CO{sub 2} (P{sub CO{sub 2}}) of 11.6 MPa. Current studies suggest that reaction kinetics can be improved by pretreatment of the mineral, catalysis of the reaction, and/or solution modification. Subsequent tests are intended to examine these options, as well as other mineral groups. Article in Journal/Newspaper Carbonic acid University of North Texas: UNT Digital Library |
institution |
Open Polar |
collection |
University of North Texas: UNT Digital Library |
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ftunivnotexas |
language |
English |
topic |
Partial Pressure Silicate Minerals Carbon Dioxide Water Carbon Dioxide Sequestration Mineral Carbonation 37 Inorganic Organic Physical And Analytical Chemistry 36 Materials Science Kinetics 58 Geosciences Reaction Kinetics Carbonic Acid Carbon Dioxide Sequestration Carbonates Catalysis Olivine Cations Ambient Temperature Stirring |
spellingShingle |
Partial Pressure Silicate Minerals Carbon Dioxide Water Carbon Dioxide Sequestration Mineral Carbonation 37 Inorganic Organic Physical And Analytical Chemistry 36 Materials Science Kinetics 58 Geosciences Reaction Kinetics Carbonic Acid Carbon Dioxide Sequestration Carbonates Catalysis Olivine Cations Ambient Temperature Stirring O'Connor, W. K. Dahlin, D. C. Turner, P. C. Walters, R. Carbon dioxide sequestration by ex-situ mineral carbonation |
topic_facet |
Partial Pressure Silicate Minerals Carbon Dioxide Water Carbon Dioxide Sequestration Mineral Carbonation 37 Inorganic Organic Physical And Analytical Chemistry 36 Materials Science Kinetics 58 Geosciences Reaction Kinetics Carbonic Acid Carbon Dioxide Sequestration Carbonates Catalysis Olivine Cations Ambient Temperature Stirring |
description |
The process developed for carbon dioxide sequestration utilizes a slurry of water mixed with olivine- forsterite end member (Mg{sub 2}SiO{sub 4}), which is reacted with supercritical CO{sub 2} to produce magnesite (MgCO{sub 3}). Carbon dioxide is dissolved in water to form carbonic acid, which likely dissociates to H{sup +} and HCO{sub 3}{sup -}. The H{sup +} hydrolyzes the silicate mineral, freeing the cation (Mg{sup 2+}), which reacts with the HCO{sub 3}{sup -} to form the solid carbonate. Results of the baseline tests, conducted on ground products of the natural mineral, have demonstrated that the kinetics of the reaction are slow at ambient temperature (22 degrees C) and subcritical CO{sub 2} pressures (below 7.4 MPa). However, at elevated temperature and pressure, coupled with continuous stirring of the slurry and gas dispersion within the water column, significant conversion to the carbonate occurs. Extent of reaction is roughly 90% within 24 h, at 185 degrees C and partial pressure of CO{sub 2} (P{sub CO{sub 2}}) of 11.6 MPa. Current studies suggest that reaction kinetics can be improved by pretreatment of the mineral, catalysis of the reaction, and/or solution modification. Subsequent tests are intended to examine these options, as well as other mineral groups. |
author2 |
United States. Office of Fossil Energy. |
format |
Article in Journal/Newspaper |
author |
O'Connor, W. K. Dahlin, D. C. Turner, P. C. Walters, R. |
author_facet |
O'Connor, W. K. Dahlin, D. C. Turner, P. C. Walters, R. |
author_sort |
O'Connor, W. K. |
title |
Carbon dioxide sequestration by ex-situ mineral carbonation |
title_short |
Carbon dioxide sequestration by ex-situ mineral carbonation |
title_full |
Carbon dioxide sequestration by ex-situ mineral carbonation |
title_fullStr |
Carbon dioxide sequestration by ex-situ mineral carbonation |
title_full_unstemmed |
Carbon dioxide sequestration by ex-situ mineral carbonation |
title_sort |
carbon dioxide sequestration by ex-situ mineral carbonation |
publisher |
Cognizant Communication Corporation, 3 Hartsdale Road, Elmsford, NY 10523 |
publishDate |
2000 |
url |
https://digital.library.unt.edu/ark:/67531/metadc877629/ |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
Second International Dixy Lee Ray Memorial Symposium, Washington, DC, Aug. 29 - Sept. 2, 1999 |
op_relation |
rep-no: DOE/ARC-1999-009 osti: 875354 https://digital.library.unt.edu/ark:/67531/metadc877629/ ark: ark:/67531/metadc877629 |
_version_ |
1766387697667014656 |