2026-10-16 東京大学
カンラン石を利用した地表および地下でのCO₂鉱物化プロセス
＜関連情報＞
- https://www.t.u-tokyo.ac.jp/press/pr2026-10-16-001
- https://www.nature.com/articles/s41467-026-78548-z
表面炭酸化は、CO₂の急速な鉱化作用におけるカンラン石の反応性を左右する Surface carbonation governs olivine reactivity for rapid CO2 mineralization
Zihua Shao, Yunfeng Liang, Gyuhwan Jo, Keisuke Nakamura & Takeshi Tsuji
Nature Communications Published:14 October 2026
DOI:https://doi.org/10.1038/s41467-026-78548-z Ealy provide
Abstract
Ultramafic rocks are a global resource with vast potential for permanent CO2 mineralization. However, the origin of the striking reactivity difference between Ca- and Mg-bearing olivine remains poorly understood. Here we show that this difference arises not merely from the type of cation, but more fundamentally from how these cations modulate the oxygen reactivity. Nonbridging oxygens serve as the oxygen source for CO2 surface reactions, which in Ca-olivine reduce the Ca2+ dissolution barrier by 60% and accelerate ion release by six orders of magnitude. The calculated apparent dissolution rate constants reproduce the experimentally observed complete conversion of Ca-olivine within hours under 1 atm CO2. This multiscale framework reveals how surface reactions govern silicate carbonation and provides a predictive basis for modeling and engineering large-scale CO2 mineralization in both synthetic materials and basaltic reservoirs.
