Enhancing the performance of a novel CoRu/CeO2 bimetallic catalyst for the dry reforming of methane via a mechanochemical process

A mechanochemical synthesis method has been used to synthesize CoRu nanoparticles supported on CeO2 for methane dry reforming. In this work, we study the effect of Ru addition to Co/CeO2-based catalysts and of the synthesis method by screening their catalytic activity, using synchrotron X-ray diffra...

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Detalhes bibliográficos
Autores: Armengol Profitós, Marina, Braga, Andrea, Pascua Solé, Laia|||0000-0001-9791-4586, Lucentini, Ilaria|||0000-0003-1311-9062, García de Andrés, Xènia|||0000-0003-0795-4168, Soler Turu, Lluís|||0000-0003-1591-3366, Vendrell Villafruela, Xavier|||0000-0003-4705-8253, Serrano Carreño, M. Isabel|||0000-0002-4996-9280, Villar García, Ignacio J., Pérez Dieste, Virginia, Escudero, Carlos, Jiménez Divins, Nuria|||0000-0001-6010-5419, Llorca Piqué, Jordi|||0000-0002-7447-9582
Formato: artículo
Fecha de publicación:2024
País:España
Recursos:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/408129
Acesso em linha:https://hdl.handle.net/2117/408129
https://dx.doi.org/10.1016/j.apcatb.2023.123624
Access Level:acceso abierto
Palavra-chave:Catalysis
Mechanochemistry
Methane dry reforming (DRM)
Operando characterization
Bimetallic catalyst
Hydrogen production
Catàlisi
Àrees temàtiques de la UPC::Enginyeria química
Descrição
Resumo:A mechanochemical synthesis method has been used to synthesize CoRu nanoparticles supported on CeO2 for methane dry reforming. In this work, we study the effect of Ru addition to Co/CeO2-based catalysts and of the synthesis method by screening their catalytic activity, using synchrotron X-ray diffraction (XRD), and operando near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS). Ruthenium addition directly impacts the reducibility of cobalt species and results in smaller particle sizes, as demonstrated by H2-temperature programmed reduction and XRD. NAP-XPS shows that Ru modifies the metal-support interaction, as evidenced by the higher Ce3+/Ce ratios for the bimetallic samples and tuning the oxidation state of Ru. The synthesis method also influences the dispersion of Co and Ru on the surface. Mechanochemically-prepared samples (mono- and bimetallic) outperformed the conventionally-synthesized counterparts by reaching higher CH4 and CO2 conversions, resulting in a stable CoRu/CeO2 catalyst for 24 h at 700 °C and yielding an H2/CO ratio close to 1.

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