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Enhanced Ceria Nanoflakes using Graphene Oxide as a Sacrificial Template for CO Oxidation and Dry Reforming of Methane

Rood, Shawn C., Ahmet, Huseyin B., Gomez-Ramon, Anais, Torrente-Murciano, Laura, Reina, Tomas R. and Eslava, Salvador (2018) Enhanced Ceria Nanoflakes using Graphene Oxide as a Sacrificial Template for CO Oxidation and Dry Reforming of Methane Applied Catalysis B: Environmental, 242. pp. 358-368.

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Abstract

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.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Rood, Shawn C.
Ahmet, Huseyin B.
Gomez-Ramon, Anais
Torrente-Murciano, Laura
Reina, Tomas R.t.ramirezreina@surrey.ac.uk
Eslava, Salvador
Date : 9 October 2018
Funders : Engineering and Physical Sciences Research Council (EPSRC)
DOI : 10.1016/j.apcatb.2018.10.011
Copyright Disclaimer : © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/)
Uncontrolled Keywords : Ceria; Dry methane reforming; CO oxidation; Graphene oxide; Template
Related URLs :
Depositing User : Clive Harris
Date Deposited : 10 Oct 2018 15:38
Last Modified : 06 Mar 2019 11:06
URI: http://epubs.surrey.ac.uk/id/eprint/849636

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