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EnglishA treatment with H-2 at 800 degreesC followed by mild reoxidation (<300<degrees>C) increases the low temperature (<200<degrees>C) steady-state activity in the reduction of NO by propene in the presence Of O-2 of a Pt(1.5%)/(ZrO2-CeO2 on Al2O3) catalyst. The effect is not present for a lower temperature treatment with H-2 or for reoxidation above 300 degreesC. Transient reactivity tests together with characterization data (H-2-TPR, O-2 uptake, H-2 chemisorption) indicate that the high temperature reduction modifies the characteristics of ceria-zirconia and induced metal-support interaction effects, both responsible of the enhanced catalytic activity at low temperature.
| Titolo: | Enhancement of the low temperature activity in NO reduction in lean conditions by SMSI effect in Pt/CeO2-ZrO2 on alumina catalyst | |
| Autori: | ||
| Data di pubblicazione: | 2001 | |
| Rivista: | ||
| Abstract: | A treatment with H-2 at 800 degreesC followed by mild reoxidation (<300<degrees>C) increases the low temperature (<200<degrees>C) steady-state activity in the reduction of NO by propene in the presence Of O-2 of a Pt(1.5%)/(ZrO2-CeO2 on Al2O3) catalyst. The effect is not present for a lower temperature treatment with H-2 or for reoxidation above 300 degreesC. Transient reactivity tests together with characterization data (H-2-TPR, O-2 uptake, H-2 chemisorption) indicate that the high temperature reduction modifies the characteristics of ceria-zirconia and induced metal-support interaction effects, both responsible of the enhanced catalytic activity at low temperature. | |
| Handle: | http://hdl.handle.net/11368/1695299 | |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1023/A:1016611704769 | |
| Appare nelle tipologie: | 1.1 Articolo in Rivista |
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