Enhanced ceria nanoflakes using graphene oxide as a sacrificial template for CO oxidation and dry reforming of methane
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Publication Date
2019-03Journal Title
Applied Catalysis B: Environmental
ISSN
0926-3373
Publisher
Elsevier BV
Volume
242
Pages
358-368
Type
Article
This Version
VoR
Metadata
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Rood, S., Ahmet, H., Gomez-Ramon, A., Torrente-Murciano, L., Reina, T., & Eslava, S. (2019). Enhanced ceria nanoflakes using graphene oxide as a sacrificial template for CO oxidation and dry reforming of methane. Applied Catalysis B: Environmental, 242 358-368. https://doi.org/10.1016/j.apcatb.2018.10.011
Abstract
© 2018 The Authors 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.
Sponsorship
Engineering and Physical Sciences Research Council (EP/L020432/2)
Identifiers
External DOI: https://doi.org/10.1016/j.apcatb.2018.10.011
This record's URL: https://www.repository.cam.ac.uk/handle/1810/286614
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