Ni-based oxides are widely investigated as catalysts for CO 2 methanation due to their high activity, high selectivity and low cost. The catalytic performances of Ni-based catalysts depend on support properties that strongly influence the dispersion of the catalytic active phase and the Ni-support interaction. Although the CO 2 methanation is widely studied, the structure sensitivity of methanation on nickel is not completely assessed. Ni/CeO 2 nanorods with different nickel/ceria molar ratios (0.05, 0.10, 0.20, 0.30) were prepared by one-pot hydrothermal synthesis. The effect of nickel content and metal particle size on catalytic activity and selectivity for CO 2 methanation were studied using CO 2 :H 2 = 1:4 stoichiometric ratio at high space velocity (300 L g −1 h −1 ). Sample structure and morphology were studied by X-ray diffraction (XRD), Brunauer-Emmet-Teller (BET) analysis, field-emission scanning electron microscopy/energy-dispersive spectroscopy (FE-SEM/EDS), H 2 -temperature programmed reduction (TPR), H 2 -temperature-programmed desorption (TPD). Both the CO production and the turnover frequency appear depending on nickel particle size, suggesting a structure sensitivity of the CO 2 methanation on nickel supported on ceria.

Structure-sensitivity of CO 2 methanation over nanostructured Ni supported on CeO 2 nanorods

Luisetto I.
2019

Abstract

Ni-based oxides are widely investigated as catalysts for CO 2 methanation due to their high activity, high selectivity and low cost. The catalytic performances of Ni-based catalysts depend on support properties that strongly influence the dispersion of the catalytic active phase and the Ni-support interaction. Although the CO 2 methanation is widely studied, the structure sensitivity of methanation on nickel is not completely assessed. Ni/CeO 2 nanorods with different nickel/ceria molar ratios (0.05, 0.10, 0.20, 0.30) were prepared by one-pot hydrothermal synthesis. The effect of nickel content and metal particle size on catalytic activity and selectivity for CO 2 methanation were studied using CO 2 :H 2 = 1:4 stoichiometric ratio at high space velocity (300 L g −1 h −1 ). Sample structure and morphology were studied by X-ray diffraction (XRD), Brunauer-Emmet-Teller (BET) analysis, field-emission scanning electron microscopy/energy-dispersive spectroscopy (FE-SEM/EDS), H 2 -temperature programmed reduction (TPR), H 2 -temperature-programmed desorption (TPD). Both the CO production and the turnover frequency appear depending on nickel particle size, suggesting a structure sensitivity of the CO 2 methanation on nickel supported on ceria.
CO ; 2; methanation ; CO ; 2; valorization ; Ni supported on ceria; Structure-activity relationship
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12079/52667
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