The role of surface properties in CO2 methanation over carbon-supported Ni catalysts and their promotion by Fe

• Tipo: Artigo em Revista Científica Internacional
• Data: 2020

Autores

Goncalves, LPL (Autor) Outra; Sousa, JPS (Autor) Outra; O.S.G.P. Soares (Autor) FEUP; Bondarchuk, O (Autor) Outra; Lebedev, OI (Autor) Outra; Kolen'ko, YV (Autor) Outra; Manuel Fernando R Pereira (Autor) FEUP

Revista

Título: Catalysis Science and Technology

Vol. 10

Páginas: 7217-7225

ISSN: 2044-4753

Editora: Royal Society of Chemistry

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 2 Citações

Outras Informações

ID Authenticus: P-00T-27D

DOI: 10.1039/d0cy01254h

Abstract (EN): The surface chemistry of the activated carbon supporting material was tailored to investigate the influence of O and N groups as well as O-free Lewis basic sites on the performance of Ni-based catalysts for CO2 methanation. Catalytic experiments demonstrated that 15% Ni on carbon with O-free Lewis basic sites showed the best performance (X-CO2 = 76%, S-CH4 = 97%, T = 450 degrees C, P = 1 bar), suggesting that the methanation reaction is highly dependent on the basicity of the support. Promotion with 5% Fe enabled the decrease of the optimal reaction temperature while improving the stability of the catalyst. Microstructural and compositional studies of the catalyst after a prolonged time on stream experiment suggested that the slight but gradual catalyst deactivation during methanation is associated with the sintering of Ni nanoparticles and the development of a distinct Ni@NiO core-shell nanostructure.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9