Effect of metal loading on the CO2 methanation: A comparison between alumina supported Ni and Ru catalysts

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Título: Effect of metal loading on the CO2 methanation: A comparison between alumina supported Ni and Ru catalysts
Autor/es: Quindimil, Adrián | De-La-Torre, Unai | Pereda-Ayo, Beñat | Davó-Quiñonero, Arantxa | Bailón-García, Esther | Lozano-Castello, Dolores | González-Marcos, José A. | Bueno López, Agustín | González-Velasco, Juan R.
Grupo/s de investigación o GITE: Materiales Carbonosos y Medio Ambiente
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Palabras clave: CO2 methanation | Metal loading | Ruthenium | Nickel | Particle size
Área/s de conocimiento: Química Inorgánica
Fecha de publicación: 1-oct-2020
Editor: Elsevier
Cita bibliográfica: Catalysis Today. 2020, 356: 419-432. https://doi.org/10.1016/j.cattod.2019.06.027
Resumen: The hydrogenation of CO2 into CH4 from H2 produced by renewable energy is considered an interesting alternative in order to promote the development of such green energies. In the present work, the effect of Ni and Ru loadings on the catalytic performance of alumina-supported catalysts is studied for CO2 methanation reaction. All catalysts were prepared by wetness incipient impregnation, characterized by several techniques (N2-physisorption, CO2-TPD, XRD, H2-chemisorption, XPS and H2-TPR) and evaluated for CO2 methanation in a fixed bed reactor at GHSV=10,000 h−1 and W/FCO2 0 = 4.7 (g cat.) h mol−1. Characterization results showed that addition of increasing loadings of Ni and Ru lead to the formation of both CO2 adsorption and H2 dissociation active sites, which are necessary to carry out CO2 hydrogenation into methane. Easily reducible ruthenium was dispersed on γ-Al2O3 in form of large agglomerates, whereas Ni was better dispersed presenting a great interaction with the support. 12% Ni and 4% Ru resulted to be the optimal contents providing metal surfaces of 5.1 and 0.6m2 g−1, T50 values of 340 and 310 °C and activity being quite stable for 24 h-on-stream. In terms of turnover frequency (TOF), 4%Ru/Al2O3 catalyst was quite more efficient than 12%Ni/Al2O3, probably due to a greater ability of ruthenium to dissociate hydrogen. The apparent activation energies for alumina supported Ni and Ru were 129 and 84 kJ mol−1, respectively.
Patrocinador/es: The support from the Economy and Competitiveness Spanish Ministry (CTQ2015-67597-C2-1-R and CTQ2015-67597-C2-2-R MINECO-FEDER), the Basque Government (IT657-13 and IT1297-19) and the SGIker (Analytical Services) at the University of the Basque Country are acknowledged. One of the authors (AQ) also acknowledges University of the Basque Country by his PhD grant (PIF-15/351).
URI: http://hdl.handle.net/10045/109848
ISSN: 0920-5861 (Print) | 1873-4308 (Online)
DOI: 10.1016/j.cattod.2019.06.027
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2019 Elsevier B.V.
Revisión científica: si
Versión del editor: https://doi.org/10.1016/j.cattod.2019.06.027
Aparece en las colecciones:INV - MCMA - Artículos de Revistas

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