Isotopic and in situ DRIFTS study of the CO2 methanation mechanism using Ni/CeO2 and Ni/Al2O3 catalysts

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Title: Isotopic and in situ DRIFTS study of the CO2 methanation mechanism using Ni/CeO2 and Ni/Al2O3 catalysts
Authors: Cárdenas-Arenas, Andrea | Quindimil, Adrián | Davó-Quiñonero, Arantxa | Bailón-García, Esther | Lozano-Castello, Dolores | De-La-Torre, Unai | Pereda-Ayo, Beñat | González-Marcos, José A. | González-Velasco, Juan R. | Bueno López, Agustín
Research Group/s: Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: CO2 methanation | Nickel | Ceria | Metal-support interaction | Mechanism | Isotope
Knowledge Area: Química Inorgánica
Issue Date: 15-May-2020
Publisher: Elsevier
Citation: Applied Catalysis B: Environmental. 2020, 265: 118538. doi:10.1016/j.apcatb.2019.118538
Abstract: The CO2 methanation mechanism was studied for Ni/CeO2 and Ni/Al2O3 catalysts. The higher methanation activity and selectivity of Ni/CeO2 is attributed to: i) Ni/CeO2 combines two types of active sites efficient for CO2 dissociation at the NiO-Ceria interface and for H2 dissociation on Ni0 particles; ii) water desorption is the slowest mechanism step, and, due to the high oxygen mobility throughout the ceria lattice, water is not necessarily formed on the same active sites that chemisorb CO2, i.e., the CO2 chemisorption sites are not blocked by water molecules; iii) the Ni/CeO2 surface does not accumulate carbon-containing species under reaction conditions, which allows faster chemisorption and dissociation of CO2. The Ni/Al2O3 catalyst handicaps are that all the steps of the mechanism take place on the same active sites, and the slow release of water and the accumulation of surface formates on these sites delay the chemisorption of further CO2 molecules.
Sponsor: Financial support of: - Economy and Competitiveness Spanish Ministry: Projects CTQ2015-67597-C2-1-R and CTQ2015-67597-C2-2-R MINECO-FEDER) and grant of EBG FJCI-2015-23769. - Generalitat Valenciana: Project PROMETEO/2018/076 and PhD grant of ACA GRISOLIAP/2017/185. - The Basque Government: Project IT657-13. - SGIker (Analytical Services) at the University of the Basque Country. - Spanish Ministry of Education, Culture and Sports grant of ADQ FPU14/01178. - University of the Basque Country PhD grant of AQ PIF-495 15/351.
ISSN: 0926-3373 (Print) | 1873-3883 (Online)
DOI: 10.1016/j.apcatb.2019.118538
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2019 Elsevier B.V.
Peer Review: si
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Appears in Collections:INV - MCMA - Artículos de Revistas

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