4.7 Article

Impact of Gas-Solid Reaction Thermodynamics on the Performance of a Chemical Looping Ammonia Synthesis Process

期刊

ENERGY & FUELS
卷 36, 期 17, 页码 9757-9767

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.2c01372

关键词

-

资金

  1. Engineering and Physical Sciences Research Council [EP/R51309X/1]
  2. Royal Academy of Engineering [CiET1819\2\57]
  3. EPSRC [EP/P007767/1, EP/P024807/1]

向作者/读者索取更多资源

Novel ammonia catalysts can achieve high reaction rates under milder conditions, leading to lower costs and energy requirements. The sensitivity of the energy and economic performance of a chemical looping process was evaluated based on gas-solid reaction thermodynamics, and it was found that thermodynamic parameters greatly influenced the system's performance.
ABSTRACT: Novel ammonia catalysts seek to achieve high reaction rates under milder conditions, which translate into lower costs and energy requirements. Alkali and alkaline earth metal hydrides have been shown to possess such favorable kinetics when employed in a chemical looping process. The materials act as nitrogen carriers and form ammonia by alternating between pure nitrogen and hydrogen feeds in a two-stage chemical looping reaction. However, the thermodynamics of the novel reaction route in question are only partially available. Here, a chemical looping process was designed and simulated to evaluate the sensitivity of the energy and economic performance of the processes toward the appropriate gas-solid reaction thermodynamics. Thermodynamic parameters, such as reaction pressure and especially equilibrium ammonia yields, influenced the performance of the system. In comparison to a commercial ammonia synthesis unit with a 28% yield at 150 bar, the chemical looping process requires a yield greater than 38% to achieve similar energy consumptions and a yield greater than 26% to achieve similar costs at a given temperature and 150 bar. Entropies and enthalpies of formation of the following pairs were estimated and compared: LiH/Li2NH, MgH2/MgNH, CaH2/ CaNH, SrH2/SrNH, and BaH2/BaNH. Only the LiH/Li2NH pair has satisfied the given criteria, and initial estimates suggest that a 62% yield is obtainable.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据