Ni stabilised on inorganic complex structures: superior catalysts for chemical CO2 recycling via dry reforming of methane

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Título: Ni stabilised on inorganic complex structures: superior catalysts for chemical CO2 recycling via dry reforming of methane
Autor/es: Le Saché, Estelle | Pastor Pérez, Laura | Watson, David | Sepúlveda-Escribano, Antonio | Ramírez Reina, Tomás
Grupo/s de investigación o GITE: Materiales Avanzados
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Palabras clave: Pyrochlore | CO2 conversion | Dry reforming of methane | Nickel catalysts
Área/s de conocimiento: Química Inorgánica
Fecha de publicación: 15-nov-2018
Editor: Elsevier
Cita bibliográfica: Applied Catalysis B: Environmental. 2018, 236: 458-465. doi:10.1016/j.apcatb.2018.05.051
Resumen: CO2 utilisation is becoming an appealing topic in catalysis science due to the urgent need to deal with greenhouse gases (GHG) emissions. Herein, the dry reforming of methane (DRM) represents a viable route to convert CO2 and CH4 (two of the major GHG) into syngas, a highly valuable intermediate in chemical synthesis. Nickel-based catalysts are economically viable materials for this reaction, however they show inevitable signs of deactivation. In this work stabilisation of Ni in a pyrochlore-perovskite structure is reported as a viable method to prevent fast deactivation. Substitution of Zirconium by Ni at various loadings in the lanthanum zirconate pyrochlore La2Zr2O7 is investigated in terms of reactant conversions under various reaction conditions (temperature and space velocity). XRD analysis of the calcined and reduced catalysts showed the formation of crystalline phases corresponding to the pyrochlore structure La2Zr2-xNixO7-δ and an additional La2NiZrO6 perovskite phase at high Ni loadings. Carbon formation is limited using this formulation strategy and, as a consequence, our best catalyst shows excellent activity for DRM at temperatures as low as 600 °C and displays great stability over 350 h of continuous operation. Exsolution of Ni from the oxide structure, leading to small and well dispersed Ni clusters, could explain the enhanced performance.
Patrocinador/es: Financial support for this work was provided by the Department of Chemical and Process Engineering of the University of Surrey and the EPSRC grants EP/J020184/2 and EP/R512904/1 as well as the Royal Society Research Grant RSGR1180353. Authors would also like to acknowledge the Ministerio de Economía, Industria y Competitividad of Spain (Project MAT2013-45008-P).
URI: http://hdl.handle.net/10045/76011
ISSN: 0926-3373 (Print) | 1873-3883 (Online)
DOI: 10.1016/j.apcatb.2018.05.051
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2018 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).
Revisión científica: si
Versión del editor: https://doi.org/10.1016/j.apcatb.2018.05.051
Aparece en las colecciones:INV - LMA - Artículos de Revistas

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