Enhanced ceria nanoflakes using graphene oxide as a sacrificial template for CO oxidation and dry reforming of methane
Rood, Shawn (University of Bath. Department of Chemical Engineering)
Ahmet, Huseyin B. (University of Surrey. Department of Chemical Engineering)
Gomez-Ramon, Anais (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Torrente-Murciano, Laura (University of Cambridge. Department of Chemical Engineering and Biotechnology)
Ramírez Reina, Tomás (University of Surrey. Department of Chemical Engineering)
Eslava, Salvador (University of Bath. Department of Chemical Engineering)

Fecha:	2019
Resumen:	The development of novel fabrication methods to produce ceria catalysts with good high-temperature stability is critical for their implementation across a range of different applications. Herein, graphene oxide flakes are used as a sacrificial template in the synthesis of ceria particles to replicate the graphene oxide's two-dimensionality. While performing the synthesis without graphene oxide results in large agglomerations of ceria crystallites, the addition of graphene oxide during the synthesis results in ceria nanoflakes (<10 nm) replicating the graphene oxide morphology. This novel shape limits the diffusion of atoms at high temperature to a two-dimensional plane which is translated into a low sintering degree and consequently, an enhanced thermal stability. In this way, the ceria flakes are capable of maintaining high surface areas after calcination at high temperatures (>400 °C) which results in improved catalytic performance for the oxidation of carbon monoxide. This resistance versus sintering has also a beneficial effect when ceria flakes are used as catalytic support of nickel particles. Improved metal dispersion and high metal-support interaction leads to lower sintering during the dry reforming of methane than similarly prepared un-templated ceria nickel catalysts. These results demonstrate the advantage of using graphene oxide as a sacrificial template for the production of sintering-resistant catalysts with good catalytic performance at high temperatures.
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Ceria ; Dry methane reforming ; CO oxidation ; Graphene oxide ; Template
Publicado en:	Applied catalysis. B, Environmental, Vol. 242 (March 2019) , p. 358-368, ISSN 0926-3373

DOI: 10.1016/j.apcatb.2018.10.011

11 p, 3.8 MB

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