Au-Ru/TiO2 prepared by deposition-precipitation with urea: Relevant synthesis parameters to obtain bimetallic particles
| Autor: | Rodolfo Zanella, Catherine Louis, Volkan Ortalan, Chang Wan Han, Lina A. Calzada |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Process Chemistry and Technology Inorganic chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences law.invention chemistry.chemical_compound chemistry Magazine Deposition precipitation law Gold particles Urea 0210 nano-technology Science technology and society Bimetallic strip General Environmental Science |
| Zdroj: | Applied Catalysis B: Environmental. 264:118503 |
| ISSN: | 0926-3373 |
| DOI: | 10.1016/j.apcatb.2019.118503 |
| Popis: | Although Au and Ru are not miscible in the bulk, the paper focusses on the attempts to prepare bimetallic Au-Ru/TiO2 catalysts by deposition-precipitation with urea (co-DPU and sequential DPU, Au then Ru and vice versa). Gold was found already reduced after the preparations of co-DPU and Ru then Au DPU, leading to large gold particles and to catalysts as poorly active as Ru/TiO2 in CO oxidation. The Au-Ru/TiO2 catalysts prepared by Au then Ru DPU provided the most interesting results: small bimetallic particles were formed; after reduction in H2 at 300 °C, their structure was Janus-type and Au core - Ru shell, and the catalyst was poorly active, whereas after reduction at 500 °C, the particles became mainly Ru core - Au shell, and the catalyst showed higher activity than Au/TiO2 and a synergetic effect in CO oxidation compared to the monometallic counterparts. |
| Databáze: | OpenAIRE |
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