2023-12-21 パシフィック・ノースウェスト国立研究所(PNNL)
◆太平洋北西部国立研究所（PNNL）の科学者たちは、超臨界CO2を玄武岩貯蔵層に永久に保存する方法を発見し、新しい手法「IL-TEM」を使用して鉱物と水を含む超臨界CO2の反応を観察しました。IL-TEMは貯蔵層モデルの向上に貢献し、商業的な炭素鉱化技術の展開に向けた大きな進展となります。
＜関連情報＞
- https://www.pnnl.gov/publications/nanoscale-analysis-provides-key-answers-modeling-mineralization-basalt
- https://pubs.acs.org/doi/10.1021/acs.estlett.3c00699
同一位置透過型電子顕微鏡を用いた炭素鉱化中のナノスケールプロセスの解明 Resolving Nanoscale Processes during Carbon Mineralization Using Identical Location Transmission Electron Microscopy
Xiaoxu Li, Emily T. Nienhuis, Alexandra B. Nagurney, Quin R. S. Miller, Xin Zhang, and H. Todd Schaef
Environmental Science & Technology Letters Published:December 5, 2023
DOI:https://doi.org/10.1021/acs.estlett.3c00699
Abstract
Basalt reservoirs offer the potential for carbon mineralization, aiding in achieving net-zero emissions. However, debates persist about microscopic crystallization mechanisms due to limited characterization techniques under high-temperature and pressure conditions. By using Identical Location Transmission Electron Microscopy (IL-TEM) and cryo-TEM, this study reveals nanoscale interfacial carbonation processes of forsterite and diopside nanoparticles in water-saturated supercritical carbon dioxide under realistic reservoir conditions. Both minerals undergo preferential metal cation dissolution into a thin water film, forming porous Si-rich amorphous layers, supporting the leached layer mechanism as the dominant mineral reactivity process. Diopside’s amorphous layer has lower porosity and growth rate relative to forsterite, likely related to the connectivity of silicate tetrahedra. Kinetically favorable nesquehonite and aragonite nanocrystals form on the amorphous layers. These findings support the development of accurate reservoir simulations and help enable commercial-scale carbon storage deployment.
