| Título: | Combined removal of diesel soot particulates and NOx over CeO2–ZrO2 mixed oxides |
| Autores: |
Atribak, Idriss Bueno López, Agustín García García, Avelina |
| Fecha: |
2008-10-23 2008-10-23 2008-10-01 |
| Publicador: | RUA Docencia |
| Fuente: |
 |
| Tipo: | info:eu-repo/semantics/article |
| Tema: |
Catalysed soot oxidation Ceria Ce-Zr mixed oxide Solid solution Soot NOx Diesel pollution control Química Inorgánica |
| Descripción: |
CeO2 and Ce–Zr mixed oxides with different Ce:Zr ratios were prepared; characterised by Raman
spectroscopy, XRD, TEM, N2 adsorption at −196 ◦C, and H2-TPR; and tested for soot oxidation under
NOx/O2. Among the different mixed oxides, Ce0.76Zr0.24O2 provided the best results. Ce0.76Zr0.24O2
presented greater activity than pure CeO2 for soot oxidation by NOx/O2 when both catalysts were calcined
at 500 ◦C (soot oxidation rates at 500 ◦C are 14.9 and 11.4 μgsoot/s, respectively), and the catalytic activity
of CeO2 decayed significantly with calcination temperature (from 500 to 1000 ◦C), whereas Ce0.76Zr0.24O2
presented enhanced thermal stability at temperatures as high as 1000 ◦C. In addition, Ce0.76Zr0.24O2
catalysed the reduction of NOx by soot at around 500 ◦C more efficiently than CeO2, thereby contributing
to the decreased NOx emission level. The catalytic activity of CeO2 and Ce0.76Zr0.24O2 for soot oxidation
by NOx/O2 depended on the textural properties (BET area; crystallite size), but other properties of the
oxides, such as redox behaviour and/or enhanced lattice oxygen mobility, also played a significant role. Spanish Ministry of Education and Science (Project CTQ2005-01358) and the ABL contract funded by the Ramon y Cajal Program and the Generalitat Valenciana. |
| Idioma: | Inglés |
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