Ru/NaO/AlO dual-function materials were prepared by varying the support synthesis method and Ru load. Different sol-gel-type and precipitation/ hydrothermal preparation methods were employed in order to synthesize materials with variable nanostructure, surface chemistry and textural properties, thereby effectively tuning the material activity for the methanation of pre-adsorbed CO. The materials were thoroughly characterized and evaluated during the integrated CO capture and methanation process. It was found that the Pechini sol-gel synthesis method led to the structure with the highest porosity, basic site population and high dispersion of methanation and adsorption active Ru and Al-O-Na sites. The corresponding material displayed the highest CH yield (0.47 mmol/g) and fastest CH production kinetics, while stable performance was achieved under successive adsorption-hydrogenation cycles and under the co-presence of O and HO during CO adsorption. Lastly, the increase in Ru load (0.25 wt% - 4 wt% range) could incrementally improve the CH production kinetics during hydrogenation.

中文翻译：

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使用 Ru/Na2O/Al2O3 双功能材料捕获 CO2 并进行甲烷化：载体合成方法和 Ru 负载量的影响

通过改变载体合成方法和Ru负载量制备了Ru/Na2O/Al2O双功能材料。采用不同的溶胶-凝胶型和沉淀/水热制备方法来合成具有可变纳米结构、表面化学和织构特性的材料，从而有效地调节预吸附CO甲烷化的材料活性。对材料进行了彻底的表征和研究。在综合二氧化碳捕获和甲烷化过程中进行评估。结果发现，Pechini 溶胶-凝胶合成方法导致结构具有最高的孔隙率、碱性位点数量以及高度分散的甲烷化和吸附活性Ru和Al-O-Na位点。相应的材料表现出最高的CH产率（0.47 mmol/g）和最快的CH生成动力学，同时在连续的吸附-加氢循环以及CO吸附过程中O和H2O共存下实现了稳定的性能。最后，Ru 负载量的增加（0.25 wt% - 4 wt% 范围）可以逐渐改善加氢过程中 CH 的生产动力学。