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Valorización catalítica de carbohidratos: obtención de combustibles líquidos basados en cetonas y alcoholes
Pablo Jorge Luggren Juana Isabel Di Cosimo Nora Okulik Fernando Javier Mariño Sergio Rubén de Miguel Carlos Rodolfo Apesteguía
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Resumen/Descripción – provisto por el repositorio digital
In this thesis, the gas-phase conversion of 2-hexanol, a model molecule of the primary conversion of sugars, was investigated on Cu-Mı-Mıı mixed oxides (Mı, Mıı: Mg²⁺, Al³⁺, Ce⁴⁺) with different copper content (0.3-61.2 %) to obtain higher molecular weight compounds of application as liquid transportation fuels. Catalysts were prepared by coprecipitation and characterized by several techniques such as BET surface area, XRD, TPD of CO₂, TPR and N₂O decomposition. The bifunctional metal-base catalytic process occurs through a series of sequential steps comprising dehydrogenation, C-C coupling, dehydration and hydrogenation reactions. Nano-sized Cuº particles promote dehydrogenation and hydrogenation steps whereas acid-base sites provided by Mı(Mıı)-O pairs participate in the C-C coupling reaction. Yields of up to 91 % were obtained for branched C9-C24 compounds, ≈80 % of which were suitable as jet fuels and the rest as diesel substitutes. This product pool was a hydrophobic mixture of ketones, alcohols and hydrocarbons with 160-200 g/mol average molecular weight and an O/C atomic ratio as low as 0.04. A reaction pathway leading to formation of odd carbon atom number products (C9, C15 and C21) was postulated in contrast to the conventional aldol condensation pathway toward even carbon atom number products (C12, C18 and C24). The Cu content notoriously affects the catalyst basicity, metal dispersion, activity, product distribution and rate-limiting step.Palabras clave – provistas por el repositorio digital
Alcohols; Fuels; Copper; Mixed oxides; Aldol condensation; Dehidrogenation; Alcoholes; Combustibles líquidos; Cobre; Óxidos mixtos; Condensación aldólica; Deshidrogenación
Disponibilidad
| Institución detectada | Año de publicación | Navegá | Descargá | Solicitá |
|---|---|---|---|---|
| No requiere | 2015 | Biblioteca Virtual de la Universidad Nacional del Litoral (SNRD) |
|
Información
Tipo de recurso:
tesis
Idiomas de la publicación
- español castellano
País de edición
Argentina
Fecha de publicación
2015-03-11
