Synthesis of copper-promoted CeO2 catalysts
The urea method is explored for a high-yield preparation of CuO-CeO 2 catalysts precursors. Solutions containing urea, Ce(NO 3)3, and Cu(NO3)3 were aged at 363 K for 5 h, achieving a quantitative coprecipitation in the form of amorphous Cu(II)-Ce(III) basic carbonates, with Cu(II) contents up to 40%...
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| Autores principales: | , , , , |
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| Formato: | JOUR |
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_08974756_v18_n7_p1945_Jobbagy |
| Aporte de: |
| Sumario: | The urea method is explored for a high-yield preparation of CuO-CeO 2 catalysts precursors. Solutions containing urea, Ce(NO 3)3, and Cu(NO3)3 were aged at 363 K for 5 h, achieving a quantitative coprecipitation in the form of amorphous Cu(II)-Ce(III) basic carbonates, with Cu(II) contents up to 40%. The mixed precursors were characterized by PXRD, SEM, EDS, FTIR, and TG. Upon mild thermal treatment under air atmosphere, i.e., T = 723 K, powders were readily converted into CuO-promoted nanometric ceria. No Tenorite (CuO) segregation is observed after annealing at 873 K. The binary oxides were characterized by means of temperature-programmed reduction (TPR) and a test reaction for the preferential oxidation of carbon monoxide (CO-PROX), achieving the best performance with samples containing around 20% in copper atoms. © 2006 American Chemical Society. |
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