RT journal article
T1 CO Methanation over NiO-CeO2 Mixed-Oxide Catalysts Prepared by a Modified Co-Precipitation Method: Effect of the Preparation pH on the Catalytic Performance
A1 Aberkane, Amar Bendieb
A1 Yeste Siguenza, María del Pilar
A1 Fayçal, Djazi
A1 Cauqui López, Miguel Ángel
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
K1 nickel
K1 ceria
K1 CO methanation
AB In this study, a series of NiO-CeO2 mixed-oxide catalysts have been prepared by a modified co-precipitation method similar to the one used for the synthesis of hydrotalcites. The syntheses were carried out at different pH values (8, 9 and 10), in order to determine the influence of this synthetic variable on the properties of the obtained materials. These materials were characterized by using different techniques, such as TGA, XRD, ICP, N-2 adsorption-desorption isotherms, H-2 temperature-programmed reduction (H-2-TPR), and electron microscopy, including high-angle annular dark-field transmission electron microscopy (HAADF-TEM) and EDS. The characterization results revealed the influence of the preparation method, in general, and of the pH value, in particular, on the textural properties of the oxides, as well as on the dispersion of the Ni species. The catalyst prepared at a higher pH value (pH = 10) was the one that exhibited better behavior in the CO methanation reaction (almost 100% CO conversion at 235 degrees C), which is attributed to the achievement, under these synthetic conditions, of a combination of properties (metal dispersion, specific surface area, porosity) more suitable for the reaction.
PB MDPI
SN 2079-4991
YR 2022
FD 2022-08
LK http://hdl.handle.net/10498/27971
UL http://hdl.handle.net/10498/27971
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 15-nov-2026