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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Chow, Ying-Kit Alammar, Tarek Mudring, Anja-Verena |
| Copyright Year | 2015 |
| Abstract | Ce0.5M0.5O2 (M = Ti, Zr, Hf) nanoparticles have been successfully synthesized by microwave irradiation in the ionic liquid [C4mim][Tf2N] (1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide). The morphology, crystallinity, and chemical composition of the obtained materials were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), Raman spectroscopy, and N2–adsorption measurements. XRD and Raman spectroscopy analyses confirmed the formation of solid solutions with cubic fluorite structure. The catalytic activities of the Ce0.5M0.5O2 (M = Ti, Zr, Hf) nanoparticles were investigated in the low-temperature oxidation of CO. Ce0.5Zr0.5O2 nanospheres exhibit the best performance (100% conversion at 350 °C), followed by Ce0.5Hf0.5O2 (55% conversion at 360 °C) and Ce0.5Ti0.5O2 (11% conversion at 350 °C). Heating the as-prepared Ce0.5Zr0.5O2 to 600 °C for extended time leads to a decrease in surface area and, as expected decreased catalytic activity. Depending on the ionic liquid the obtained Ce0.5Zr0.5O2 exhibits different morphologies, varying from nano-spheres in [C4mim][Tf2N] and [P66614][Tf2N] (P66614 = trishexyltetradecylphosphonium) to sheet-like assemblies in [C3mimOH][Tf2N] (C3mimOH = 1-(3-hydroxypropyl)-3-methylimidazolium). The microwave synthesis superiority to other heating methods like sonochemical synthesis and conventional heating was proven by comparative experiments where the catalytic activity of Ce0.5Zr0.5O2 obtained by alternate methods such as conventional heating was found to be poorer than that of the microwave-synthesised material. |
| Starting Page | 1339 |
| Ending Page | 1347 |
| Page Count | 9 |
| File Format | HTM / HTML PDF |
| ISSN | 11440546 |
| Volume Number | 39 |
| Issue Number | 2 |
| Journal | New Journal of Chemistry |
| DOI | 10.1039/c4nj00951g |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Fluorite Energy-dispersive X-ray spectroscopy Butyl group Microwave Microwave chemistry Raman spectroscopy Scanning electron microscope Ionic liquid X-ray crystallography Zirconium Adsorption Amide Raman |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Materials Chemistry Catalysis |
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