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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Chemical and morphological changes during olivine carbonation for COz storage in the presence of NaCl and NaHCO3
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Chemical and morphological changes during olivine carbonation for COz storage in the presence of NaCl and NaHCO3

机译：NaCl和NaHCO3存在下橄榄石碳酸化过程中用于COz储存的化学和形态变化

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The increasing concentrations of CO2 in the atmosphere are attributed to the rising consumption of fossil fuels for energy generation around the world. One of the most stable and environmentally benign methods of reducing atmospheric CO2 is by storing it as thermodynamically stable carbonate minerals. Olivine ((Mg,Fe)_2SiO4) is an abundant mineral that reacts with CO2 to form Mg-carbonate. The carbonation of olivine can be enhanced by injecting solutions containing CO2 at high partial pressure into olivine-rich formations at high temperatures, or by performing ex situ mineral carbonation in a reactor system with temperature and pressure control, in this study, the effects of NaHCO3 and NaCl, whose roles in enhanced mineral carbonation have been debated, were investigated in detail along with the effects of temperature, CO2 partial pressure and reaction time for determining the extent of olivine carbonation and its associated chemical and morphological changes. At high temperature and high CO2 pressure conditions, more than 70% olivine carbonation was achieved in 3 hours in the presence of 0.64 M NaHCO3. in contrast, NaCl did not significantly affect olivine carbonation. As olivine was dissolved and carbonated, its pore volume, surface area and particle size were significantly changed and these changes influenced subsequent reactivity of olivine. Thus, for both long-term simulation of olivine carbonation in geologic formations and the ex situ reactor design, the morphological changes of olivine during its reaction with CO2 should be carefully considered in order to accurately estimate the CO2 storage capacity and understand the mechanisms for CO2 trapping by olivine.
机译：大气中二氧化碳浓度的增加归因于世界各地用于能源生产的化石燃料消耗量的增加。减少大气中二氧化碳的最稳定，最环保的方法之一是将其作为热力学稳定的碳酸盐矿物储存。橄榄石（（Mg，Fe）_2SiO4）是一种丰富的矿物质，它与CO2反应形成碳酸镁。可以通过在高温下向富含橄榄石的地层中注入高分压的含CO2溶液或在具有温度和压力控制的反应器系统中进行非原位矿物碳酸化来增强橄榄石的碳酸化作用，在本研究中，该反应是NaHCO3的作用在确定橄榄石碳酸化程度及其相关化学和形态变化的过程中，对温度和CO2分压和反应时间的影响进行了详细研究，并详细讨论了NaCl和NaCl在增强矿物碳酸化中的作用。在高温和高CO2压力条件下，在存在0.64 M NaHCO3的情况下，在3小时内实现了70％以上的橄榄石碳酸化。相反，NaCl并未显着影响橄榄石的碳化。随着橄榄石的溶解和碳酸盐化，其孔隙体积，表面积和粒径都发生了显着变化，这些变化影响了橄榄石的后续反应性。因此，对于地质层中橄榄石碳化的长期模拟和易位反应器设计，都应仔细考虑橄榄石与CO2反应期间的形态变化，以便准确估算CO2的储存能力并了解CO2的机理。被橄榄石困住。

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