Microstructure and carbon storage capacity of hydrated magnesium carbonates synthesized from different sources and conditions

Haoliang Dong; Cise Unluer; En Hua Yang; Fei Jin; Abir Al-Tabbaa

doi:10.1016/j.jcou.2019.07.016

Microstructure and carbon storage capacity of hydrated magnesium carbonates synthesized from different sources and conditions

Haoliang Dong, Cise Unluer, En Hua Yang^*, Fei Jin, Abir Al-Tabbaa

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

35 Citations (Scopus)

Abstract

Recently, the mineral carbonation via the reaction of CO₂ with saline aquafers received much attention as one of the most promising ways for geologic CO₂ storage. This paper reports microstructure and carbon storage capacity of hydrated magnesium carbonates (HMCs) synthesized from different sources, i.e., reject brine and commercial Mg(OH)₂ slurry, and under different conditions, i.e., pH (8-14) and Mg(OH)₂:CO₂ molar ratio (1:1-1:7). Results show that dypingite (Mg₅(CO₃)₄(OH)₂·5H₂O) is the main phase forming at lower Mg(OH)₂:CO₂ ratios. An increase in the Mg(OH)₂:CO₂ ratio and/or pH leads to the precipitation of nesquehonite (MgCO₃·3H₂O). A unique "house of cards" texture, involving formation of the rosette-like dypingite flakes on the surface of nesquehonite needles, is discovered under elevated pH and Mg(OH)₂:CO₂ ratios. HMCs synthesized from reject brine exhibit a much higher carbon storage capacity of 82.6% than that produced from the commercial Mg(OH)₂ slurry (43.7%). Findings from this study advance understanding of mineral recovery from reject brine and the capture and long-term storage of CO₂ in the form of HMCs.

Original language	English
Pages (from-to)	353-361
Number of pages	9
Journal	Journal of CO2 Utilization
Volume	34
DOIs	https://doi.org/10.1016/j.jcou.2019.07.016
Publication status	Published - Dec 2019
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2019 Elsevier Ltd.

ASJC Scopus Subject Areas

Chemical Engineering (miscellaneous)
Waste Management and Disposal
Process Chemistry and Technology

Keywords

Carbon capture and storage
Hydrated magnesium carbonates (HMCs)
Mg(OH)2
pH
Reject brine

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10.1016/j.jcou.2019.07.016

Cite this

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title = "Microstructure and carbon storage capacity of hydrated magnesium carbonates synthesized from different sources and conditions",

abstract = "Recently, the mineral carbonation via the reaction of CO2 with saline aquafers received much attention as one of the most promising ways for geologic CO2 storage. This paper reports microstructure and carbon storage capacity of hydrated magnesium carbonates (HMCs) synthesized from different sources, i.e., reject brine and commercial Mg(OH)2 slurry, and under different conditions, i.e., pH (8-14) and Mg(OH)2:CO2 molar ratio (1:1-1:7). Results show that dypingite (Mg5(CO3)4(OH)2·5H2O) is the main phase forming at lower Mg(OH)2:CO2 ratios. An increase in the Mg(OH)2:CO2 ratio and/or pH leads to the precipitation of nesquehonite (MgCO3·3H2O). A unique {"}house of cards{"} texture, involving formation of the rosette-like dypingite flakes on the surface of nesquehonite needles, is discovered under elevated pH and Mg(OH)2:CO2 ratios. HMCs synthesized from reject brine exhibit a much higher carbon storage capacity of 82.6\% than that produced from the commercial Mg(OH)2 slurry (43.7\%). Findings from this study advance understanding of mineral recovery from reject brine and the capture and long-term storage of CO2 in the form of HMCs.",

keywords = "Carbon capture and storage, Hydrated magnesium carbonates (HMCs), Mg(OH)2, pH, Reject brine",

author = "Haoliang Dong and Cise Unluer and Yang, \{En Hua\} and Fei Jin and Abir Al-Tabbaa",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd.",

year = "2019",

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doi = "10.1016/j.jcou.2019.07.016",

language = "English",

volume = "34",

pages = "353--361",

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T1 - Microstructure and carbon storage capacity of hydrated magnesium carbonates synthesized from different sources and conditions

AU - Dong, Haoliang

AU - Unluer, Cise

AU - Yang, En Hua

AU - Jin, Fei

AU - Al-Tabbaa, Abir

PY - 2019/12

Y1 - 2019/12

N2 - Recently, the mineral carbonation via the reaction of CO2 with saline aquafers received much attention as one of the most promising ways for geologic CO2 storage. This paper reports microstructure and carbon storage capacity of hydrated magnesium carbonates (HMCs) synthesized from different sources, i.e., reject brine and commercial Mg(OH)2 slurry, and under different conditions, i.e., pH (8-14) and Mg(OH)2:CO2 molar ratio (1:1-1:7). Results show that dypingite (Mg5(CO3)4(OH)2·5H2O) is the main phase forming at lower Mg(OH)2:CO2 ratios. An increase in the Mg(OH)2:CO2 ratio and/or pH leads to the precipitation of nesquehonite (MgCO3·3H2O). A unique "house of cards" texture, involving formation of the rosette-like dypingite flakes on the surface of nesquehonite needles, is discovered under elevated pH and Mg(OH)2:CO2 ratios. HMCs synthesized from reject brine exhibit a much higher carbon storage capacity of 82.6% than that produced from the commercial Mg(OH)2 slurry (43.7%). Findings from this study advance understanding of mineral recovery from reject brine and the capture and long-term storage of CO2 in the form of HMCs.

AB - Recently, the mineral carbonation via the reaction of CO2 with saline aquafers received much attention as one of the most promising ways for geologic CO2 storage. This paper reports microstructure and carbon storage capacity of hydrated magnesium carbonates (HMCs) synthesized from different sources, i.e., reject brine and commercial Mg(OH)2 slurry, and under different conditions, i.e., pH (8-14) and Mg(OH)2:CO2 molar ratio (1:1-1:7). Results show that dypingite (Mg5(CO3)4(OH)2·5H2O) is the main phase forming at lower Mg(OH)2:CO2 ratios. An increase in the Mg(OH)2:CO2 ratio and/or pH leads to the precipitation of nesquehonite (MgCO3·3H2O). A unique "house of cards" texture, involving formation of the rosette-like dypingite flakes on the surface of nesquehonite needles, is discovered under elevated pH and Mg(OH)2:CO2 ratios. HMCs synthesized from reject brine exhibit a much higher carbon storage capacity of 82.6% than that produced from the commercial Mg(OH)2 slurry (43.7%). Findings from this study advance understanding of mineral recovery from reject brine and the capture and long-term storage of CO2 in the form of HMCs.

KW - Carbon capture and storage

KW - Hydrated magnesium carbonates (HMCs)

KW - Mg(OH)2

KW - pH

KW - Reject brine

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Microstructure and carbon storage capacity of hydrated magnesium carbonates synthesized from different sources and conditions

Abstract

Bibliographical note

ASJC Scopus Subject Areas

Keywords

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