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模拟二氧化碳封存的酸盐矿物界面:正态石表面的结构和稳定性

Julie Aufort¹, Izaac Mitchell², Raffaella Demichelis²

¹Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université, CNRS, MNHN, 4 place Jussieu, 75005 Paris, France.

|July 21, 2025

概括

为了捕获二氧化碳,研究了正方体石表面的原子结构. 表面不稳定,重建,影响矿物界面的二氧化碳减少.

科学领域:

地质化学地质化学
材料科学材料科学材料科学
计算化学计算化学

背景情况:

奥尔托恩斯塔提特 (Mg2Si2O6) 是一种与地质二氧化碳封存相关的酸盐矿物.
了解矿物表面的行为对于碳捕获和储存 (CCS) 技术至关重要.
定石表面的原子结构和稳定性以前没有被探索过.

研究的目的:

为了研究正方体石表面的原子结构和稳定性.
为了确定 orthoenstatite 的初级稳定表面.
了解与二氧化碳相互作用相关的表面重建机制.

主要方法:

密度函数理论 (DFT) 的计算.
经典的刚性离子力场建模.
对非极性静态测量面的分析,重点关注{210},{010},{100},{110}和{120}的面.

主要成果:

确定了三个主要稳定的正方体石表面:{210},{010}和{100}.
在文献中经常引用的{100}表面是最不稳定的.
在{100}表面观察到显著的表面重建,涉及原子重新排列和协调变化.

结论:

表面重建受到化学环境 (例如,氧化或酸盐形成) 的影响,影响其反应性.
提供了在静态石-气体界面上建模二氧化碳减排的基础知识.
允许在二氧化碳捕获环境中开发未来的静态-液体接口模型.

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