The addition of alkali molten salts has been reported as a strategy to overcome the sintering problem presented by calcium oxide in CO₂ capture systems. In this work, the influence of sodium doping in a CaO sorbent was investigated in the sorption enhanced steam methane reforming process (SE-SMR). The goal was to increase the stability of the sorbent and, consequently, the efficiency of the process. For that, a Na-containing sorbent was prepared using the precipitation technique and a pure calcium oxide was obtained by calcination of CaCO₃. The sorbents were physically mixed with 10 % Ni/Al₂O₃ catalyst and tested in 10 cycles of SE-SMR at 600 °C and CH₄:H₂O equals to 4. In general, both materials showed 100 % of CH₄ conversion and H₂ molar fraction of 93.5 vol.%. However, regarding the stability over the SE-SMR cycles, it was evidenced that the addition of sodium decreased the duration of pre-breakthrough comparing with the non-doped material. The XRD, SEM, and TGA results allowed us to observe an inverse relationship of particle diameter and CO₂ capture performance. Na₂CO₃-CaO presented a larger average crystallite size compared to the pure CaO which led to a higher probability of the CaCO₃ layers to inactivate the calcium oxide and, consequently, caused a strong sintering effect. Besides the presence of sodium, the precipitation method and the synthesis conditions could have favored the low initial CO₂ uptake and poor stability of the Na₂CO₃-CaO sorbent.

据报道，添加碱性熔盐是克服 CO ₂捕集系统中氧化钙带来的烧结问题的一种策略。在这项工作中，在吸附增强蒸汽甲烷重整过程 (SE-SMR) 中研究了钠掺杂对 CaO 吸附剂的影响。目标是提高吸附剂的稳定性，从而提高过程的效率。为此，使用沉淀技术制备含钠吸附剂，并通过煅烧CaCO ₃获得纯氧化钙。吸附剂与 10% Ni/Al ₂ O ₃催化剂物理混合，并在 600 °C 和 CH ₄ :H _{2 条件下}进行 10 次 SE-SMR 循环测试O等于4。通常，两种材料都显示出100%的CH ₄转化率和93.5 vol.%的H ₂摩尔分数。然而，关于 SE-SMR 循环的稳定性，有证据表明，与非掺杂材料相比，钠的添加减少了预击穿的持续时间。XRD、SEM 和 TGA 结果使我们能够观察到粒径和 CO ₂捕获性能的反比关系。与纯 CaO 相比，Na ₂ CO ₃ -CaO 呈现出更大的平均微晶尺寸，这导致 CaCO _{3 的}概率更高层使氧化钙失活，从而引起强烈的烧结效应。除了钠的存在外，沉淀方法和合成条件可能有利于Na ₂ CO ₃ -CaO 吸附剂的初始 CO ₂吸收低和稳定性差。