Gold nanoparticles supported on mesoporous iron oxide for enhanced CO oxidation reaction
| Autor: | Tsuruo Nakayama, Yusuke Yamauchi, Yohei Jikihara, Mohamed Zakaria, Jungmok You, Shunsuke Tanaka, Abdulmohsen Ali Alshehri, Shahriar A. Hossain, Jianjian Lin, Yusuf Valentino Kaneti, Shin-ichi Yusa |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Iron oxide Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Redox 0104 chemical sciences Catalysis chemistry.chemical_compound Chemical engineering chemistry Colloidal gold Copolymer General Materials Science 0210 nano-technology Mesoporous material Dispersion (chemistry) |
| Zdroj: | Nanoscale. 10:4779-4785 |
| ISSN: | 2040-3372 2040-3364 |
| DOI: | 10.1039/c7nr08895g |
| Popis: | Herein, we report the synthesis of gold (Au)-loaded mesoporous iron oxide (Fe2O3) as a catalyst for both CO and NH3 oxidation. The mesoporous Fe2O3 is firstly prepared using polymeric micelles made of an asymmetric triblock copolymer poly(styrene-b-acrylic acid-b-ethylene glycol) (PS-b-PAA-b-PEG). Owing to its unique porous structure and large surface area (87.0 m2 g-1), the as-prepared mesoporous Fe2O3 can be loaded with a considerably higher amount of Au nanoparticles (Au NPs) (7.9 wt%) compared to the commercial Fe2O3 powder (0.8 wt%). Following the Au loading, the mesoporous Fe2O3 structure is still well-retained and Au NPs with varying sizes of 3-10 nm are dispersed throughout the mesoporous support. When evaluated for CO oxidation, the Au-loaded mesoporous Fe2O3 catalyst shows up to 20% higher CO conversion efficiency compared to the commercial Au/Fe2O3 catalyst, especially at lower temperatures (25-150 °C), suggesting the promising potential of this catalyst for low-temperature CO oxidation. Furthermore, the Au-loaded mesoporous Fe2O3 catalyst also displays a higher catalytic activity for NH3 oxidation with a respectable conversion efficiency of 37.4% compared to the commercial Au/Fe2O3 catalyst (15.6%) at 200 °C. The significant enhancement in the catalytic performance of the Au-loaded mesoporous Fe2O3 catalyst for both CO and NH3 oxidation may be attributed to the improved dispersion of the Au NPs and enhanced diffusivity of the reactant molecules due to the presence of mesopores and a higher oxygen activation rate contributed by the increased number of active sites, respectively. |
| Databáze: | OpenAIRE |
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