College of Engineering and Applied Science, University of Wyoming, Laramie, WY 82071, USA; Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USA.
College of Engineering and Applied Science, University of Wyoming, Laramie, WY 82071, USA.
J Environ Sci (China). 2019 Apr;78:74-80. doi: 10.1016/j.jes.2018.07.005. Epub 2018 Jul 26.
Amine-basedcarbon-capture technologies have been shown to be energetically expensive and to cause significant environmental and epidemiological impacts due to their volatility. Bicarbonate formation from carbon dioxide's reaction with water has been suggested as an effective alternative for capturing CO; however, the thermodynamics of this reaction are not well understood. This study experimentally determined the equilibrium constant of sodium bicarbonate (NaHCO) decomposition to sodium, water, and carbon dioxide; the study also compared the equilibrium constant to theoretical calculations. Using a combination of experimentation and thermodynamic relationships, the unitless equilibrium constants of the forward and reverse reactions were calculated accurately (error <±9% and <±4%, respectively). Equilibrium data were calculated using enthalpy and entropy values of each component of NaHCO decomposition at temperatures ranging from 25 to 155°C respectively. These results offer more data essential to optimizing NaHCO use in environmentally friendly next-generation CO-capture technologies.
基于胺的碳捕集技术由于其挥发性而被证明在能量上是昂贵的，并会造成重大的环境和流行病学影响。二氧化碳与水反应生成碳酸氢盐已被提议作为捕获 CO 的有效替代方法；然而，该反应的热力学性质尚不清楚。本研究通过实验确定了碳酸氢钠（NaHCO）分解为钠、水和二氧化碳的平衡常数；该研究还将平衡常数与理论计算进行了比较。本研究使用实验和热力学关系相结合的方法，准确地计算了正、逆反应的无量纲平衡常数（误差分别为<±9%和<±4%）。在 25 至 155°C 的温度范围内，分别使用碳酸氢钠分解各组分的焓和熵值计算了平衡数据。这些结果提供了优化碳酸氢钠在环保型下一代 CO 捕集技术中应用所必需的更多数据。
