Descriptors Affecting Methane Selectivity in CO2 Hydrogenation over Unpromoted Bulk Iron(III)-Based Catalysts

Boosting CO2 hydrogenation to methane over Ni-based ETS-10 zeolite catalyst

The activation and conversion of the CO₂ molecule have always been the most vexing challenge due to its chemical inertness. Developing highly active catalysts, which could overcome dynamic limitations, has emerged as a provable and effective method to promote CO₂ activation–conversion. Herein, ETS-10 zeolite–based catalysts, with active nickel species introduced by in situ doping and impregnation, have been employed for CO₂ methanation. Conspicuous CO₂ conversion (39.7%) and perfect CH₄ selectivity (100%) were achieved over the Ni-doped ETS-10 zeolite catalyst at 280°C. Comprehensive analysis, which include X-ray diffraction, N₂ adsorption–desorption, SEM, TEM, H₂ chemisorption, CO₂ temperature programmed desorption, and X-ray photoelectron spectroscopy, was performed. Also, the results indicated that the resultant hierarchical structure, high metal dispersion, and excellent CO₂ adsorption–activation capacity of the Ni-doped ETS-10 zeolite catalyst played a dominant role in promoting CO₂ conversion and product selectivity.