替代减缓了低水位超临界二氧化碳中的化碳化
John S Loring1, Tenley E Webb1, Mark E Bowden1
1Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA. john.loring@pnnl.gov.
Physical chemistry chemical physics : PCCP
|October 11, 2024
概括
从矿石中回收结合二氧化碳储存是有希望的. 然而,会减缓酸碳化,影响效率,需要进一步研究以优化.
科学领域:
- 地质化学 地质化学
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
背景情况:
- 从低等级矿石中回收提供了经济潜力,当与二氧化碳 (CO2) 储存相结合时.
- 了解对金属酸盐碳化的影响及其在这个过程中的行为对于可行性至关重要.
研究的目的:
- 在低水位条件下研究合的化石 ((Mg,Co) 2SiO4) 的碳化.
- 确定对二氧化碳储存相关的酸碳化速率和机制的影响.
主要方法:
- 使用 *in situ* 红外光谱学来监测碳化反应.
- 在50°C和90bar的加湿超临界CO2中,在薄水薄膜中检查了Co-doped石的碳化.
主要成果:
- 合合的化率从合合的化石到合富的化石 ((Mg,Co) CO3) 随着水膜厚度的增加而增加.
- 观察到的碳化速率至少比在类似条件下的纯森林石慢10倍.
- 鉴定了Co-doped马格尼石的过度和减少,可能是较慢速率的原因.
结论:
- 在石中加入可以显著减缓碳化速率.
- 热力学因素,特别是较低的过和,决定了在存在时碳化效率的降低.
- 调查结果强调了将回收与二氧化碳封存相结合的挑战和考虑因素.
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