期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 242, 期 -, 页码 358-368出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2018.10.011
关键词
Ceria; Dry methane reforming; CO oxidation; Graphene oxide; Template
资金
- Engineering and Physical Sciences Research Council (EPSRC) [EP/L016354/1, EP/R512904/1, EP/P008097/1, EP/L020432/2]
- EPSRC [EP/P008097/1, EP/L020432/2] Funding Source: UKRI
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 degrees 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.
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