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4 Φεβ 2021 · Magnesium-rich silicate minerals, such as olivine ((Mg,Fe) 2 SiO 4), in ultramafic and mafic rocks have the potential to produce reactive Mg(OH) 2 with zero CO 2 emissions.
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28 Ιουν 2024 · Ocean alkalinity enhancement (OAE) reduces the concentration of dissolved carbon dioxide (CO 2) in seawater, leading to atmospheric carbon dioxide removal (CDR). Here we report laboratory...
30 Αυγ 2013 · This study investigated the pathways of H 2 O enhanced Mg (OH) 2 carbonation at elevated temperatures and CO 2 pressures (up to 673 K and 1.52 MPa) in the presence of steam and in the slurry phase. For a given reaction temperature, carbonation conversion showed dramatic increase with increasing H 2 O loading.
The proposed mechanism considers the direct effect of the carboxyl moieties (–COO −) found in the polysaccharide constituents of those microorganisms which lowers the energy requirements for dehydrating the Mg 2+ cations while also serving as templates for the nucleation and growth of the Mg carbonates. 25,40 The carboxyl groups play ...
Seawater is a vast reservoir of divalent cations (Ca 2+, Mg 2+) and dissolved CO 2 that can form sparingly soluble carbonates (and/or hydroxides). Long-term (millions of years) storage of CO 2 on Earth occurs by mineralization through the formation of calcite (CaCO 3) and aragonite (CaCO 3 ).
25 Αυγ 2019 · The formation of MgCO 3 ·3H 2 O in the CO 2 mineralization system was investigated using Mg(OH) 2 as an intermediate at 20 °C. Liquid and solid analyses were done for qualitative and quantitative composition characterizations of the reacted samples.
Here we show a novel low-carbon method of 26 producing Mg(OH)2, from globally abundant olivine-rich silicate rocks. A combination 27 of acid digestion and electrolysis of olivine were used to produce Mg(OH)2 in a fully 28 recoverable system. The use of Mg(OH)2 from olivine provides a viable pathway for
