Skeletal isomerization of linear butenes on boron promoted ferrierite: Effect of the catalyst preparation technique
Potassium and acid ferrierites were impregnated with boron species by wet and incipient wetness techniques. All samples display a medium-intensity band at 3,450-3,470 cm-1 associated to Si-OH•••O groups corresponding to boron-containing units. The 1,398-1,404 cm-1 band assigned to the B-O stretching...
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2008 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/65295 |
| Acceso en línea: | http://hdl.handle.net/11336/65295 |
| Access Level: | acceso abierto |
| Palabra clave: | Boronferrierite Isobutene Skeletal Isomerization Wet Impregnation https://purl.org/becyt/ford/2.4 https://purl.org/becyt/ford/2 |
| Sumario: | Potassium and acid ferrierites were impregnated with boron species by wet and incipient wetness techniques. All samples display a medium-intensity band at 3,450-3,470 cm-1 associated to Si-OH•••O groups corresponding to boron-containing units. The 1,398-1,404 cm-1 band assigned to the B-O stretching in BO3 units does not appear on boron-potassium-ferrierite prepared by wet impregnation. Catalytic performance during the linear butene skeletal isomerization was measured. At 300 °C, boron impregnated by incipient wetness technique on acid ferrierite reduces both linear butene conversion at a short time and isobutene yield in all time range. Boron-potassium-ferrierite prepared by wet impregnation has a suitable acidity to promote isobutene production. At 450 °C, this sample shows the best performance, being the isobutene yield 1.7 times higher than the acid-ferrierite one and reaching the highest isobutene selectivity (92%). This performance is maintained with time. Both isobutene yield and by-product distribution are strongly affected by temperature; dimer intermediates are formed. Finally, both kinds of hydroxyl groups corresponding to 3,466 and 3,635 cm-1 bands influence the isobutene production whereas BO3 sites are inactive for this reaction. |
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