Ni-based catalysts, 13.5 Ni wt.%, with enhanced thermal stability and catalytic performance for CO₂ methanation have been synthesized with different La₂O₃ loadings. Catalysts have been extensively characterised by: XRD, IR, H₂-TPR, IPA-TPD, UV–vis-NIR, FE-SEM and tested in CO₂ methanation. SiO₂ addition to Al₂O₃ support decreases the activity for CO₂ methanation, while lanthanum acts as suitable promoter by strongly increasing catalytic performances. Silica presence successfully inhibits the formation of crystalline perovskites phases, stabilizes support morphology, and allows the introduction of high La₂O₃ loadings, allowing a better control of acid-base properties. 37 % wt. La₂O₃ addition gives rise to even higher performances than those previously observed, i.e. 83 % CH₄ yield at 573 K. Reaction orders for CO₂ and H₂ have been determined; La- addition is confirmed to be responsible for a reduction in the CO₂ reaction order, suggesting a stronger CO₂ adsorption and the possible role of these species as a reactant reservoirs.

已经合成了具有不同La ₂ O ₃负载的具有13.5 Ni wt。％的Ni基催化剂，其具有增强的热稳定性和用于CO ₂甲烷化的催化性能。催化剂的广泛特征是：XRD，IR，H ₂ -TPR，IPA-TPD，UV-vis-NIR，FE-SEM，并在CO ₂甲烷化中进行了测试。除Al ₂ O ₃载体外，SiO ₂降低了CO ₂甲烷化的活性，而镧则通过大大提高催化性能而作为合适的促进剂。二氧化硅的存在可成功抑制结晶钙钛矿相的形成，稳定载体形态，并允许引入高La₂ O ₃负载，可以更好地控制酸碱性质。37％重量 的La ₂ ö ₃除了产生了甚至更高的性能比以前观察到的那些，即，83％CH ₄产率在573个K.反应订单CO ₂和H ₂已被确定; 证实了La加成是导致CO ₂反应顺序降低的原因，这表明更强的CO ₂吸附能力以及这些物质作为反应物储库的可能作用。