Mechanism of tetralin ring opening and ring contraction over bifunctional Ir/SiO2-Al2O3 catalysts
| Autor: | Guy Toussaint, Laurent Piccolo, Salim Nassreddine, Christophe Geantet |
|---|---|
| Přispěvatelé: | Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC) |
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
General Chemical Engineering
Amorphous silica-alumina 02 engineering and technology [CHIM.CATA]Chemical Sciences/Catalysis 010402 general chemistry 021001 nanoscience & nanotechnology Heterogeneous catalysis Photochemistry 01 natural sciences [SDE.ES]Environmental Sciences/Environmental and Society 0104 chemical sciences Catalysis chemistry.chemical_compound General Energy chemistry Hydrogenolysis Environmental Chemistry General Materials Science Tetralin 0210 nano-technology Selectivity Bifunctional Isomerization |
| Zdroj: | ChemSusChem ChemSusChem, ChemPubSoc Europe/Wiley, 2012, 5, pp.1717-1723. ⟨10.1002/cssc.201200080⟩ |
| ISSN: | 1864-5631 1864-564X |
| DOI: | 10.1002/cssc.201200080⟩ |
| Popis: | The development of cleaner fuels from conventional resources requires the finding of new hydrotreatment processes able to improve the combustion performances of fuels and limit undesirable emissions. In the context of gas oil upgrading by selective ring opening, we have investigated the hydroconversion of tetralin over iridium nanoparticles supported on amorphous silica-alumina. The conversion of tetralin leads to hydrogenation, ring-contraction, and ring-opening products. The selectivity to ring-opening/-contraction products (ROCPs) increases linearly with the acid-metal site ratio and can be tuned by modifying the metal loading, the metal nanoparticle size, or the support composition. From the combination of catalytic tests at variable conversion and the products identification by two-dimensional gas chromatography, a mechanistic reaction scheme has been established. Aromatic ROCPs are formed through purely acidic steps, whereas the formation of saturated ROCPs mostly involves bifunctional reaction steps. Iridium-catalyzed hydrogenolysis appears to be a minor pathway with respect to iridium-catalyzed hydrogenation and Bronsted acid catalyzed isomerization. |
| Databáze: | OpenAIRE |
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