For the conventional Ni/SiO₂ catalyst, the weak metal-support interaction usually resulted in serious Ni sintering at high temperature. To address this problem, a group of Ni-phyllosilicate-derived Ni/SiO₂ catalysts were synthesized via the hydrothermal reaction of nickel nitrate and mesostructured silica nanoparticles (MSN) with three different sizes of 99 (M_S), 184 (M_M), and 725 (M_L) nm. The Ni contents of three nickel phyllosilicate catalysts varied from 5.9 to 19.7 wt%, which exhibited a reverse order of the particle size. It was found that the concentration of silanol group (SiOH) of MSN significantly affected the construction of Ni-phyllosilicate material. The surface silanol group concentration increased with the decrease of particle size of MSN, resulting in the improved formation of nickel phyllosilicate and enhanced catalytic activity for CO₂ methanation. Among all catalysts, M_S/H-24 showed the highest CO₂ conversion of 76.5 % at 450 °C due to the highest Ni dispersion and largest CO₂ and H₂ uptakes. In addition, the optimal catalyst exhibited higher anti-sintering property, long-term stability and hydrothermal stability than an impregnated catalyst (Ms/Im) with the similar Ni content in a lifetime test (450 °C, 100 h) and steam treatment test (600 °C, 6 h), owing to its strong metal-support interaction derived from nickel phyllosilicate.

对于传统的Ni/SiO ₂催化剂，弱金属-载体相互作用通常会导致Ni在高温下严重烧结。为了解决这个问题，通过硝酸镍和介孔结构二氧化硅纳米粒子（MSN）的水热反应合成了一组Ni-页硅酸盐衍生的Ni/SiO ₂催化剂，具有三种不同尺寸的99（M _S），184（M _M） ，和725（M_大号）纳米。三种层状硅酸镍催化剂的 Ni 含量从 5.9 到 19.7 wt% 不等，表现出相反的粒度顺序。发现硅烷醇基团（SiOH) MSN显着影响Ni-页硅酸盐材料的构建。表面硅烷醇基团浓度随着MSN粒径的减小而增加，导致页硅酸镍形成的改善和对CO ₂甲烷化的催化活性增强。在所有催化剂中，M _S /H-24在 450 °C 时表现出最高的 CO ₂转化率，达到 76.5 %，这是因为 Ni 分散度最高，CO ₂和 H ₂最大吸收。此外，在寿命试验（450℃，100h）和蒸汽处理试验中，最佳催化剂比具有相似Ni含量的浸渍催化剂（Ms/Im）表现出更高的抗烧结性能、长期稳定性和水热稳定性(600 °C, 6 h)，由于其来自页硅酸镍的强金属-载体相互作用。