Effect of preparation procedure and composition of catalysts based on Mn and Ce oxides in the simultaneous removal of NOX and o-DCB
[EN] Two series of catalysts based on Mn and Ce oxides were prepared by co-precipitation and impregnation, in order to study their physicochemical properties and catalytic performance in the simultaneous reduction of NO and oxidation of o-DCB. Co-precipitation catalysts showed better activity than t...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Universidad del País Vasco |
| Repositorio: | Addi. Archivo Digital para la Docencia y la Investigación |
| OAI Identifier: | oai:addi.ehu.eus:10810/71703 |
| Acceso en línea: | http://hdl.handle.net/10810/71703 |
| Access Level: | acceso abierto |
| Palabra clave: | MnOX and CeO2 Co-precipitation Impregnation o-DCB NH3-SCR |
| Sumario: | [EN] Two series of catalysts based on Mn and Ce oxides were prepared by co-precipitation and impregnation, in order to study their physicochemical properties and catalytic performance in the simultaneous reduction of NO and oxidation of o-DCB. Co-precipitation catalysts showed better activity than those prepared by impregnation because of the formation of a MnOX-CeO2 solid solution, which improves redox and acid properties. Moreover, the catalysts with MnOX content between 80 and 90 mol.%, in which a coexistence between solid solution phase and Mn2O3 crystal was found, presented NO conversion above 90 % at temperatures below 250 °C and o-DCB conversion above 80 % at temperatures above 200 °C. The main by-products of SCR were N2O, produced in the whole range of temperature, and NO2, formed at temperatures above 300 °C. Selectivity to CO2 above 80 % was obtained using co-precipitation catalysts in all temperature range. Deactivation experiments showed that oxidation reaction strongly contributes to deactivate impregnation catalysts, whereas the effect of deactivation is lower in co-precipitation catalysts at high Mn contents. |
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