Enhanced CO2 methanation over Ni-based catalysts: a comparative study on silica and alumino-silicate supports

作者：Matteo Tommasi, Alice Gramegna, Alessandro Di Michele, Ermelinda Falletta, Federico Galli, Laura Prati, Ceri Hammond, Ilenia Rossetti · 发表于：International Journal of Hydrogen Energy · 年份：2025 · DOI：10.1016/j.ijhydene.2025.04.217 · 被引用次数：16 · 研究领域：Catalysts for Methane Reforming、Catalytic Processes in Materials Science、Zeolite Catalysis and Synthesis

Various catalysts were prepared through wet impregnation of a Ni precursor. Different supports (SiO 2 , SiO 2 Fumed and ZSM-5) and metal loadings were used, yielding catalysts with different specific surface area, metal support interaction and Ni dispersion. All catalysts showed the presence of a crystalline phase referable to NiO as precursor of the Ni active phase. SEM-EDX analysis confirmed a uniform distribution of the active phase on the support. H 2 -TPR analysis allowed to discriminate between two metal oxide reduction temperatures, indicative of metal dispersion and metal-support interaction strength. Provided that the overall peaks intensity increased with raising Ni loading, raising the Ni content led to a higher increase in intensity of a low reduction temperature peak with respect to higher temperature ones. This was attributed to weak interaction between the NiO and the support and bulker metal particles at high metal concentration. The reduction feature separated in two clearly identifiable reduction peaks for the samples with 45 wt% Ni loading. Experimental tests conducted at atmospheric pressure showed very promising results for the catalysts with the highest Ni-loading with the Silica support. Significant differences between the use of SiO 2 and SiO 2 Fumed were found. SiO 2 Fumed supported materials showed a very high SSA, higher pore volume and bigger pore width compared to the other catalysts. A higher NiO reducibility was correlated for all tests with a h...