CO and CO2 methanation over Ni catalysts supported on CeO2, Al2O3 and Y2O3 oxides
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Methanation of carbon oxides (CO and CO2) was studied over Ni-based catalysts supported on CeO2, Al2O3, and Y2O3 oxides. Catalysts were synthesized by solution combustion synthesis and characterized by N2-physisorption, XRD, H2-TPR, TEM, CO-chemisorption, UV–vis DRS, XPS, and CO2-TPD. The effect of reaction temperature (250-500¿°C) was investigated under atmospheric pressure, space velocity (GHSV) of 10,000¿h-1, and stoichiometric reactants ratio of (H2-CO2)/(CO¿+¿CO2)¿=¿3. It can be concluded that the nature of Ni-support interactions played a crucial role in enhancing CO and CO2 hydrogenation at low reaction temperature. Ni/CeO2 catalyst deactivated rapidly due to coke deposition, while the formation of NiAl2O4 spinel explained the lower activity of the Al2O3-supported system. Activity data for Ni/Y2O3 catalysts were closely related to the degree of Ni dispersion as well as to the medium-strength basicity. Good anti-coking and anti-sintering ability were observed after 200¿h of lifetime test.
CitationItaliano, C. [et al.]. CO and CO2 methanation over Ni catalysts supported on CeO2, Al2O3 and Y2O3 oxides. "Applied catalysis B. Environmental", 5 Maig 2020, vol. 264, p. 118494:1-118494:16.
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