Power and Dipple MgO carbon sequestration
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Transcript of Power and Dipple MgO carbon sequestration
Ian Power* and Greg Dipple
Department of Earth, Ocean and Atmospheric Sciences The University of British Columbia, *[email protected]
Assessing the carbon sequestration potential of magnesium oxychloride cement boards
This study 1) documented the fate of fixed
CO2 within magnesium oxychloride (MOC) boards, 2) fingerprinted the source of CO2 to confirm its value as a greenhouse gas offset, 3) determined the passive rate of CO2 sequestration within boards under ambient factory conditions, and 4) determined the potential for accelerating carbonation of MOC board using elevated concentrations of CO2.
2Th Degrees75706560555045403530252015105
Cou
nts
15,000
10,000
5,000
0
Quantifying carbon sequestration
Mineral abundance data and carbon analyses of MgO powders and magnesium oxychloride boards were used to
quantify the amount of sequestered carbon dioxide
X-ray diffraction pattern of MOC board with quantitative analysis
Plates of magnesium carbonate (CO2 sink) associated with needles of magnesium oxychloride phase 5
Changes in microstructure
2 µm
Fingerprinting carbon sources
Stable carbon and oxygen isotopic data were used to confirm the sequestration of atmospheric CO2 within magnesium
oxychloride boards
0
5
10
15
20
-15 -10 -5 0 5
δ18 O
(per
mil)
δ13C (per mil)
Boards MgO
Atmospheric CO2
Bedrock CO2
Rate of carbon sequestration
0.0
0.2
0.4
0.6
0.8
1.0
1.2
0 5 10 15
Seco
ndar
y C
O2 m
ass
/ boa
rd a
rea
(kg/
m2 )
Age (years)
An estimated rate of carbon sequestration within magnesium oxychloride board is 1 kg CO2/m2 of board over 15 years
Carbonation experiment
300 µm
100% CO2
Storage of boards under 100% relative humidity and 100% CO2 accelerated rates of carbon sequestration by nearly 1000x