The impact of alkali promotion on the CO₂ hydrogenation activity and selectivity over 1 %Ru/Al₂O₃ catalyst was investigated varying the type of metal (Li, Na, K) and precursor salt (carbonates vs. nitrates) while keeping constant the equivalent weight load. Catalysts prepared by sequential impregnations of Ru and alkali precursors on highly resistant γ-Al₂O₃ spheres (1 mm) were characterized by XRD, BET, H₂ chemisorption, PSD, FT-IR, CO₂-TPD, H₂-TPRx and CO₂ catalytic hydrogenation tests at atmospheric pressure under continuous flow conditions in the temperature range 200–430 °C. It was found that both CO₂ capture capacity and methanation activity of Ru/Al₂O₃ catalyst were simultaneously increased only via doping with Li (nitrate), which largely reacted with alumina to form a mixed spinel phase. Therefore, Li-Ru/Al₂O₃ catalyst was successfully tested as a dual functional material operating the cyclic chemical looping process of CO₂-capture followed by its methanation under alternating flow conditions at a fixed temperature as low as 230 °C.

研究了碱促进剂对1％Ru / Al ₂ O ₃催化剂上CO ₂氢化活性和选择性的影响，该方法改变了金属（Li，Na，K）和前体盐（碳酸盐与硝酸盐）的类型，同时保持了恒定。当量重量负荷。通过Ru和碱前体的顺序浸渍上高度耐制备的γ-Al催化剂₂ ö ₃球（1mm）的表征通过XRD，BET，H ₂化学吸附，PSD，FT-IR，CO ₂ -TPD，H ₂ -TPRx在大气压力和200–430°C温度范围内连续流动条件下进行CO ₂催化氢化试验。结果发现，无论是CO仅通过掺杂Li（硝酸盐）即可同时提高Ru / Al ₂ O ₃催化剂的₂捕获容量和甲烷化活性，而Li与硝酸盐大量反应形成混合尖晶石相。因此，成功地将Li-Ru / Al ₂ O ₃催化剂作为双功能材料进行了测试，该材料运行CO ₂捕集的循环化学环化过程，然后在固定温度低至230°C的交替流动条件下进行甲烷化。