Synthesis by the sol-gel method and characterization of Pt-promoted CuO/TiO2-ZrO2 catalysts for decomposition of 2-propanol
| Autor: | F.J. Tzompantzi-Morales, R. Pérez-Hernández, C. Ornelas-Gutiérrez, Pastora Salinas-Hernández, Fernando Morales-Anzures |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Decomposition Catalysis 0104 chemical sciences law.invention Ion Propanol chemistry.chemical_compound chemistry Octahedron law Acetone Calcination 0210 nano-technology Sol-gel Nuclear chemistry |
| Zdroj: | Catalysis Today. 349:228-234 |
| ISSN: | 0920-5861 |
| Popis: | We report the synthesis of xCuO/TiO2-ZrO2 catalysts containing 1, 5 and 10 wt % CuO by the sol-gel method. The solids were dried at 100 °C for 24 h and calcined at 400 °C for another 24 h in an open-air atmosphere. Part of these samples was impregnated with 0.5 wt % of PtO by the wet impregnation method. Samples were characterized by H2-TPR, TPD-CO2, SEM, TEM, XRD and 2-propanol decomposition. Our H2-TPR results indicate that Pt impregnation on the xCuO/TiO2-ZrO2 system promotes the CuO reduction at lower temperature close to 190 °C. UV–Vis bands were associated with isolated Cu2+ ions in octahedral coordination corresponding to CuO particles; and isolated Cu2+ ions in coordination lower than octahedral. Pt impregnation on the surface of the xCTZ samples promotes new basic sites appearing at high temperature as confirmed by TPD-CO2. The higher conversion for the decomposition of 2-propanol to acetone shows that the basic properties of the CuOxPtOx/TiO2-ZrO2 catalysts are superior to those of CuOx/TiO2-ZrO2 samples. |
| Databáze: | OpenAIRE |
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