ArticleEnvironmental science & technology2023
Armoring of MgO by a Passivation Layer Impedes Direct Air Capture of CO
Article in Environmental science & technology, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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4 citing papers in PubMed, 31 citations in OpenAlex.
- Spatially decoupled electrochemical strategy for lime passivation prevention and sustainable phosphate recovery.Nature communications · 2026Article
- Effect of multiple calcination cycles on COScientific reports · 2025Article
- Inhibition of Reaction Layer Formation on MgO(100) by Doping with Trace Amounts of Iron.The journal of physical chemistry. C, Nanomaterials and interfaces · 2025Article
- Exploring the Potential of Nonclassical Crystallization Pathways to Advance Cementitious Materials.Chemical reviews · 2024Review
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Authors and funding
9 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
It has been proposed to use magnesium oxide (MgO) to separate carbon dioxide directly from the atmosphere at the gigaton level. We show experimental results on MgO single crystals reacting with the atmosphere for longer (decades) and shorter (days to months) periods with the goal of gauging reaction rates. Here, we find a substantial slowdown of an initially fast reaction as a result of mineral armoring by reaction products (surface passivation). In short-term experiments, we observe fast hydroxylation, carbonation, and formation of amorphous hydrated magnesium carbonate at early stages, leading to the formation of crystalline hydrated Mg carbonates. The preferential location of Mg carbonates along the atomic steps on the crystal surface of MgO indicates the importance of the reactive site density for carbonation kinetics. The analysis of 27-year-old single-crystal MgO samples demonstrates that the thickness of the reacted layer is limited to ∼1.5 μm on average, which is thinner than expected and indicates surface passivation. Thus, if MgO is to be employed for direct air capture of CO
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