In the present work, CO2 methanation was investigated over Ni, Fe, Ni3Fe1, Ni1Fe1 and Ni1Fe3 catalysts supported on Gadolinia Doped Ceria (GDC) in the temperature range 200-400 degrees C. Both CO2 and H-2 conversion decreased in the order Ni/GDC > Ni3Fe1/GDC > Ni1Fe1/GDC > Ni1Fe3/GDC. No catalytic activity was displayed by Fe/GDC. Maximum CO2 conversion (>90%) was observed at 400 degrees C, with almost 100% selectivity to CH4. The catalysts were characterized by X Ray Diffraction (XRD), N-2 adsorption/desorption, H-2 Temperature Programmed Reduction (H-2-TPR), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS) and CO2 Temperature Programmed Desorption (CO2-TPD). The superior activity of monometallic Ni/GDC with respect to bimetallic Ni Fe/GDC catalysts was ascribed to the presence of surface oxygen vacancies induced by the GDC support, an enhanced basicity of the Ni-rich samples, as well as to the ability of the Ni-GDC to interact with CO2, as suggested by XPS data. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
The role of Gadolinia Doped Ceria support on the promotion of CO2 methanation over Ni and Ni-Fe catalysts
Monforte G;Bonura G;Ferraro M;Dispenza G;Antonucci V;
2017
Abstract
In the present work, CO2 methanation was investigated over Ni, Fe, Ni3Fe1, Ni1Fe1 and Ni1Fe3 catalysts supported on Gadolinia Doped Ceria (GDC) in the temperature range 200-400 degrees C. Both CO2 and H-2 conversion decreased in the order Ni/GDC > Ni3Fe1/GDC > Ni1Fe1/GDC > Ni1Fe3/GDC. No catalytic activity was displayed by Fe/GDC. Maximum CO2 conversion (>90%) was observed at 400 degrees C, with almost 100% selectivity to CH4. The catalysts were characterized by X Ray Diffraction (XRD), N-2 adsorption/desorption, H-2 Temperature Programmed Reduction (H-2-TPR), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS) and CO2 Temperature Programmed Desorption (CO2-TPD). The superior activity of monometallic Ni/GDC with respect to bimetallic Ni Fe/GDC catalysts was ascribed to the presence of surface oxygen vacancies induced by the GDC support, an enhanced basicity of the Ni-rich samples, as well as to the ability of the Ni-GDC to interact with CO2, as suggested by XPS data. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.