Ni and Ni-Mg phyllosilicate mesoporous SBA-15 catalysts were successfully prepared via ammonia evaporation (AE) method as evidenced by XRD, H₂-TPR, TEM, FTIR and EXAFS fitting results. The catalysts derived from phyllosilicate structure exhibit superior catalytic performance in CO₂ methanation as compared to catalyst prepared via wetness impregnation (WI) method due to enhanced metal-support interaction and the presence of weakly basic sites provided by surface hydroxyl groups. Incorporation of Mg into phyllosilicate structure with optimum 5 wt% is also found to increase medium basic sites, which can promote monodentate formate formation as identified by DRIFTS analysis and improve CO₂ methanation activity at lower temperatures. Additionally, the turnover frequency of CO₂ conversion can be well correlated with the concentration of basic sites. The strong metal-support interaction derived from phyllosilicate structure along with confinement effect of SBA-15 can suppress metal sintering, resulting in good stability.

XRD，H ₂ -TPR，TEM，FTIR和EXAFS拟合结果证明，通过氨蒸发（AE）方法成功制备了Ni和Ni-Mg页硅酸盐介孔SBA-15催化剂。与通过湿法浸渍（WI）方法制备的催化剂相比，源自页硅酸盐结构的催化剂在CO ₂甲烷化中表现出优异的催化性能，这归因于增强的金属-载体相互作用以及表面羟基提供的弱碱性位点的存在。还发现以最佳的5 wt％将Mg掺入页硅酸盐结构中可以增加中等的碱性位点，如DRIFTS分析所确定的，这可以促进单齿甲酸盐的形成并改善CO ₂低温下的甲烷化活性。另外，CO ₂转化的周转频率可以与碱性位点的浓度很好地相关。源于页硅酸盐结构的强金属-载体相互作用以及SBA-15的限制作用可以抑制金属烧结，从而具有良好的稳定性。