Fabrication of FeO -ZrO2 nanostructures for automotive three-way catalysts by supercritical hydrothermal synthesis with supercritical CO2 drying
| Autor: | Gimyeong Seong, Tetsuya Nanba, Takaaki Tomai, Yoshino Nakagawa, Akira Yoko, Seiichi Takami, Osamu Okada, Tadafumi Adschiri, Tsutomu Aida |
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| Rok vydání: | 2019 |
| Předmět: |
Nanostructure
Fabrication Materials science General Chemical Engineering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Supercritical fluid Hydrothermal circulation 0104 chemical sciences Catalysis Chemical engineering Hydrothermal synthesis Reactivity (chemistry) Physical and Theoretical Chemistry 0210 nano-technology NOx |
| Zdroj: | The Journal of Supercritical Fluids. 147:302-309 |
| ISSN: | 0896-8446 |
| DOI: | 10.1016/j.supflu.2018.11.015 |
| Popis: | In this study, an inexpensive and abundant FeOx-based catalyst was developed as a three-way catalyst (TWC). The deactivation associated with the fusion and aggregation of metallic iron under high-temperature reducing conditions was solved by the formation of FeOx-ZrO2 nanostructures. Furthermore, high dispersibility of FeOx in the nanostructures and multiple pores were successfully formed using a supercritical CO2 drying. As a result, the oxygen storage capacity of the FeOx increased dramatically and high stability was obtained. In a TWC reactivity evaluation, the FeZr-TWC showed a high performance similar to that of the commercially available CeO2-based TWC. Even after aging treatment for 20 h at 1000 °C under a 10 vol% steam condition, an NOx (T80, NOx) conversion of greater than 80% was successfully achieved, whereas it was not achieved by the standard TWC. Therefore, the FeZr nanostructures are expected to have sufficient capacity to replace the conventional CeO2-based TWCs. |
| Databáze: | OpenAIRE |
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