The present work studied the effect of different carbon dioxide (CO₂) adsorbents on Ni‐based dual‐function materials (DFMs) for the development of carbon capture and on‐site utilization in a reactor at isothermal condition. The DFMs containing Ni functioning as a methanation catalyst with various CO₂ adsorbents (i.e., CaO, MgO, K₂CO₃, or Na₂CO₃) were prepared on γ‐Al₂O₃ through sequential impregnation. The result indicated that Ni‐Na₂CO₃/γ‐Al₂O₃ had the highest methanation capacity (i.e., 0.1783 mmol/g) and efficiency (i.e., 71.09%) in the CO₂ adsorption–methanation test. The CO₂ uptake and the subsequent methanation capacity of the Ni‐Na₂CO₃/γ‐Al₂O₃ increased to more than 24 times and more than 17 times, respectively, compared to Ni/γ‐Al₂O₃. The high methanation capacity was correlated to its highest amount of weak basic sites, substantial CO₂ capture capacity and capture/release efficiency, and reactivity to H₂ at a lower temperature, supported by CO₂‐TPD, TGA analyses for adsorption or adsorption–desorption at the isothermal condition, and H₂‐TPRea, respectively. A continuous cyclic CO₂ adsorption–methanation was performed by using the Ni‐Na₂CO₃/γ‐Al₂O₃ and Ni‐CaO/γ‐Al₂O₃, showing that the CO₂ adsorption capacity was stabilized from third cycle onward, whereas the methanation capacity was stabilized at all cycles, indicating the high stability of the DFMs for both CO₂ adsorption and subsequent methanation. This work demonstrated successful synthesis of the Ni‐based, low‐cost, and stable DFMs with the ability to produce methane via the direct capture of CO₂.

中文翻译：

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CO2吸附剂对Ni基双功能材料进行CO2捕获和原位甲烷化的影响

目前的工作研究了不同的二氧化碳（CO ₂）吸附剂对镍基双功能材料（DFM）的影响，以发展碳捕获和在等温条件下反应器中的现场利用。含有Ni作为与各种CO甲烷化催化剂发挥功能的的DFM ₂吸附剂（即，氧化钙，氧化镁，K ₂ CO ₃，或Na ₂ CO ₃）中制备上的γ-Al ₂ ö ₃通过顺序浸渍。结果表明，Ni‐Na ₂ CO ₃ / γ‐Al ₂ O ₃在CO ₂吸附甲烷化试验中甲烷化率最高（0.1783 mmol / g），效率最高（71.09％）。该CO ₂吸收和的Ni娜后续甲烷化容量₂ CO ₃ /γ-Al系₂ ö ₃分别增加至超过24倍，超过17倍，与Ni相比/γ-Al系₂ ö ₃。高甲烷化容量相关的弱碱性位的最高量，大量CO ₂捕获能力和捕获/释放效率，和反应性至H ₂在较低温度下，通过CO支持₂-TPD，TGA分析分别为等温条件下的吸附或吸附-解吸和H ₂ -TPRea。通过使用Ni‐Na ₂ CO ₃ / γ‐Al ₂ O ₃和Ni‐CaO / γ‐Al ₂ O ₃进行连续循环的CO ₂吸附-甲烷化反应，表明从第三次循环开始，CO _2的吸附能力稳定。从此以后，甲烷化能力在所有循环中都保持稳定，这表明DFM对两种CO ₂的高稳定性吸附和随后的甲烷化。这项工作表明成功合成了镍基，低成本且稳定的DFM，并具有通过直接捕获CO ₂产生甲烷的能力。