Dynamics of Magnesite Formation at Low Temperature and High pCO_2 in Aqueous Solution

Odeta Qafoku; David A. Dixon; Kevin M. Rosso; Herbert T. Schaef; Mark E. Bowden; Bruce W. Arey; Andrew R. Felmy

首页> 外文期刊>Environmental Science & Technology >Dynamics of Magnesite Formation at Low Temperature and High pCO_2 in Aqueous Solution

【24h】

Dynamics of Magnesite Formation at Low Temperature and High pCO_2 in Aqueous Solution

机译：低温高浓度pCO_2水溶液中菱镁矿形成动力学。

获取原文

获取原文并翻译 | 示例

掌桥外文数据库（机构版） >>

开具论文收录证明 >>

文献代查 >>

页面导航

摘要
著录项
相似文献
相关主题

摘要

Magnesite precipitation from aqueous solution, despite conditions of supersaturation, is kinetically hindered at low temperatures for reasons that remain poorly understood. The present study examines the products of Mg(OH)_2 reaction in solutions saturated with supercritical CO_2 at high pressures (90 and 110 atm) and low temperatures (35 and 50 ℃). Solids characterization combined with in situ solution analysis reveal that the first reaction products are the hydrated carbonates hydromagnesite and nesquehonite, appearing simultaneously with brucite dissolution. Magnesite is not observed until it comprises a minor product at 7 days reaction at 50 ℃. Complete transition to magnesite as the sole product at 35 ℃ (135 days) and at a faster rate at 50 ℃ (56 days) occurs as the hydrated carbonates slowly dissolve under the slightly acidic conditions generated at high pCO_2. Such a reaction progression at high pCO_2 suggests that over long term the hydrated Mg- carbonates functioned as intermediates in magnesite formation. These findings highlight the importance of developing a better understanding of the processes expected to occur during CO_2 storage. They also support the importance of integrating magnesite as an equilibrium phase in reactive transport calculations of the effects of CO_2 sequestration on geological formations at long time scale.

机译：尽管存在过饱和条件，但从水溶液中菱镁矿沉淀在动力学上仍然受阻，原因尚不清楚。本研究研究了在高压（90和110 atm）和低温（35和50℃）下超临界CO_2饱和溶液中Mg（OH）_2反应的产物。固体表征与原位溶液分析相结合显示，第一个反应产物是水合碳酸盐水菱镁矿和水镁石，与水镁石溶解同时出现。菱镁矿直到在50℃下反应7天才形成次要产物时才观察到菱镁矿。由于水合碳酸盐在高pCO_2产生的弱酸性条件下缓慢溶解，因此在35℃（135天）以50℃（56天）以更快的速度完全转变成菱镁矿。在高pCO_2下的这种反应进程表明，从长远来看，水合碳酸镁碳酸盐可作为菱镁矿形成的中间体。这些发现突出了对更好地理解CO_2储存过程中预期发生的过程的重要性。他们还支持将菱镁矿整合为平衡相的重要性，这是在很长的时间内对二氧化碳固存对地质构造的影响的反应输运计算中。

著录项

来源
《Environmental Science & Technology》 |2015年第17期|10736-10744|共9页
作者
Odeta Qafoku; David A. Dixon; Kevin M. Rosso; Herbert T. Schaef; Mark E. Bowden; Bruce W. Arey; Andrew R. Felmy;
展开▼
作者单位

Pacific Northwest National Laboratory, P.O. Box 999, MS K8-96, Richland, Washington 99352, United States;

Department of Chemistry, The University of Alabama, Shelby Hall, Tuscaloosa, Alabama 35487, United States;

Pacific Northwest National Laboratory, P.O. Box 999, MS K8-96, Richland, Washington 99352, United States;

Pacific Northwest National Laboratory, P.O. Box 999, MS K8-96, Richland, Washington 99352, United States;

The Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, United States;

The Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, United States;

Pacific Northwest National Laboratory, P.O. Box 999, MS K8-96, Richland, Washington 99352, United States,Washington State University, Pullman, Washington 99164, United States;

展开▼
收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种 eng
中图分类
关键词

相似文献

外文文献
中文文献
专利

1. Calcite, dolomite and magnesite dissolution kinetics in aqueous solutions at acid to circumneutral pH, 25 to 150?°C and 1 to 55?atm pCO_2: New constraints on CO_2 sequestration in sedimentary basins [J] . Pokrovsky O.S., Golubev S.V., Schott J., Chemical geology . 2009,第3a4期

机译：在酸性至环境pH值，25至150？C和1至55？atm pCO_2下方解石，白云石和菱镁矿在水中的溶解动力学：沉积盆地中CO_2螯合的新限制
2. Dissolution kinetics of magnesite in acidic aqueous solution, a hydrothermal atomic force microscopy (HAFM) study: Step orientation and kink dynamics [J] . Guntram Jordan, Steven R. Higgins, Carrick M. Eggleston, Geochimica et Cosmochimica Acta: Journal of the Geochemical Society and the Meteoritical Society . 2001,第23期

机译：菱镁矿在酸性水溶液中的溶解动力学，水热原子力显微镜研究（HAFM）：步向和扭结动力学
3. Atomistic Molecular Dynamics Simulations of the Lower Critical Solution Temperature Transition of Poly(N-vinylcaprolactam) in Aqueous Solutions [J] . Sun Xiaoquan, Qian Xianghong The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical . 2019,第23期

机译：聚（N-乙烯基己内酰胺）在水溶液中较低的临界溶液温度转变的原子分子动力学模拟
4. Molecular Dynamics Simulations to Determine the Effect of Temperatures and Salt on the Structures of Polyacrylamide and Partially Hydrolyzed Polyacrylamide in Aqueous Solution [C] . Ge Zhou, Jianhui Luo, Qiang Yin, 第四届国际分子模拟与信息技术应用学术会议（The 4th International Conference of Molecular Simulations and Applied Informatics Technologies）论文集 . 2008

机译：确定温度和盐对水溶液中聚丙烯酰胺和部分水解聚丙烯酰胺结构影响的分子动力学模拟
5. THERMODYNAMICS OF AQUEOUS ELECTROLYTE SOLUTIONS AT HIGH TEMPERATURES AND PRESSURES (HEAT CAPACITY, CUBIC SPLINE, DENSITY). [D] . GATES, JEFFREY A. 1985

机译：高温和高压（热容量，立方样条线，密度）下电解质水溶液的热力学。
6. Free Energetics of Carbon Nanotube Association in Aqueous Inorganic NaI Salt Solutions: Temperature Effects using All-Atom Molecular Dynamics Simulations [O] . Shu-Ching Ou, Di Cui, Matthew Wezowicz, -1

机译：无机盐水溶液中碳纳米管缔合的自由能：使用全原子分子动力学模拟的温度效应
7. Hydration and Dynamic Behavior of Poly(N-isopropylacrylamide)s in Aqueous Solution: A Sharp Phase Transition at the Lower Critical Solution Temperature [O] . -1

机译：水溶液中聚（N-异丙基丙烯酰胺）S的水合和动力学行为：临界溶液温度下的尖锐相变
8. Microcalorimetric Detection of Lower Critical Solution Temperatures in Aqueous Polymer Solutions. [R] . Schild, H. G., Tirrell, D. A. 1990

机译：微量热法检测水溶液中低临界溶解温度。

Dynamics of Magnesite Formation at Low Temperature and High pCO_2 in Aqueous Solution

摘要

著录项

相似文献

相关主题

期刊订阅