| Autor: |
de M.H.J.M. Croon, D.M. Perez Ferrandez, J.C. Schouten, T.A. Nijhuis, M.P.G. Teley, I. Herguedas Fernandez |
| Přispěvatelé: |
Chemical Reactor Engineering, Chemical Engineering and Chemistry |
| Jazyk: |
angličtina |
| Rok vydání: |
2015 |
| Předmět: |
|
| Zdroj: |
Journal of Catalysis, 330, 396-405. Academic Press Inc. |
| ISSN: |
0021-9517 |
| Popis: |
A kinetic study of the epoxidation of propene with molecular oxygen and water in the gas phase has been carried out. This reaction avoids the use of hydrogen as co-reactant, reducing operation costs and simplifying the overall process. Two Au–Ti catalysts were evaluated: Au/TS-1 and Au/Ti–SiO2. It was observed that Au/TS-1 promoted by Cs is active for the reaction, producing propene oxide (PO) and acrolein almost in a one to one ratio. On the other hand, Au/Ti–SiO2 produced acrolein with almost 100% selectivity. This difference in activity can be due to the presence of alkali ions and the higher dispersion of Ti atoms in the case of TS-1. Water in the gas stream is essential for the synthesis of OOH* species that are the active species in the epoxidation. A kinetic model was developed to understand the reaction mechanism. It was determined that an excess of oxygen and water is favorable for the PO/acrolein ratio, while propene has a slight detrimental effect. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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