This work presents an in-situ neutron imaging study of the ammonia sorption reaction in a SrCl₂-Expanded Natural Graphite (ENG) composite loaded into a honeycomb-shaped stainless-steel scaffold and enclosed in a thermochemical heat storage (THS) reactor prototype. The performance of SrCl₂/Sr(NH₃)₈Cl₂-ENG under different pressures and temperatures was investigated and the spatio-temporal content of ammonia was calculated from neutron radiograms. Quantitative image analysis revealed the formation of Sr(NH₃)₈Cl₂ upon ammonia uptake, while the desorption studies revealed a partial ammonia desorption resulting in the formation of the monoamine phase Sr(NH₃)Cl₂ via a stepwise release of ammonia. Neutron imaging also allowed the indirect evaluation of the stainless-steel honeycomb heat conductivity and showed that heat is transferred prevalently via the ENG matrix. Finally, neutron tomography of the reactor prototype was performed to ensure the stability of the THS system and composite material throughout the ammonia cycling experiments.

这项工作提出了原位中子成像研究，研究了SrCl ₂膨胀天然石墨（ENG）复合材料中的氨吸附反应，该复合材料装载到蜂窝状不锈钢支架中并封装在热化学储热（THS）反应器原型中。研究了SrCl ₂ / Sr（NH ₃）₈ Cl ₂ -ENG在不同压力和温度下的性能，并根据中子射线图计算了氨的时空含量。定量图像分析揭示了Sr（NH ₃）₈ Cl _2的形成当氨吸收时，解吸研究表明部分氨解吸，通过逐步释放氨形成单胺相Sr（NH ₃）Cl ₂。中子成像还可以间接评估不锈钢蜂窝的导热性，并显示热量主要通过ENG矩阵传递。最后，对反应堆原型进行中子层析成像，以确保整个氨气循环实验中THS系统和复合材料的稳定性。