| Autor: |
Izabela Witońska, Stanislaw Karski, Andrei Stanishevsky, Michael J. Walock, Michał Binczarski, Magdalena Lesiak |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Journal of Molecular Catalysis A: Chemical. 393:248-256 |
| ISSN: |
1381-1169 |
| DOI: |
10.1016/j.molcata.2014.06.022 |
| Popis: |
The effect of iron introduction on the activity and selectivity of chemically precipitated supported palladium catalysts in the hydrodechlorination of 2,4-dichlorophenol in liquid phase at room temperature was studied. Bimetallic Pd–Fe catalysts supported on silica and alumina were characterized by using XPS, XRD, ToF-SIMS and TPR-H2 techniques. The dispersion of active phase in catalytic systems was examined by XRD and chemisorption of CO gas. Bimetallic Pd–Fe/SiO2 and Pd–Fe/Al2O3 catalysts containing 5 wt.% of Pd and 1–20 wt.% of Fe demonstrated high activity and high selectivity to phenol. However, Pd–Fe/Al2O3 catalysts with higher dispersion of the active phase were less active in the studied reaction than Pd–Fe/SiO2 systems, but selectivity to phenol was comparable for both types of bimetallic catalysts. The stability of Pd–Fe/SiO2 systems was higher than the bimetallic Pd–Fe/Al2O3 catalysts but selectivity to phenol decreases for that system systematically in each cycle of reaction, reaching only about 40% in the tenth cycle. It was also found that the addition of Fe to palladium catalysts limited the formation of cyclohexanone in the reaction medium. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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