1. Compared activity and stability of Pd/Al2O3 and Pd/AC catalysts in 4-chlorophenol hydrodechlorination in different pH media
- Author
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de Pedro, Zahara M., Diaz, Elena, Mohedano, Angel F., Casas, Jose A., and Rodriguez, Juan J.
- Subjects
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CHLOROPHENOLS , *SODIUM hydroxide , *PALLADIUM , *ALUMINUM , *ACTINIUM , *CHLORINATION , *CATALYST supports - Abstract
Abstract: Hydrodechlorination of 4-chlorophenol using Pd/A2O3 as catalyst at mild conditions (30°C, 1atm) was carried out in plain water, buffered (CH3COOH/NaCH3COO, NaH2PO4/Na2HPO4 and NaHCO3/Na2CO3) and alkaline NaOH media at different pH. The highest reaction rate was achieved when the process was carried out at alkaline NaOH solution of pH=8.5. Continuous long term experiments (τ: 5.4kgcat h/mol) were performed in plain water and alkaline medium using Pd/Al2O3 and Pd/AC as catalysts. The former showed an appreciable loss of activity upon time on stream, which was associated with the formation of palladium chloride complexes. However, a residual activity remained practically stable, reaching very similar 4-chlorophenol conversion (36%) in both reaction media. The Pd/AC catalyst maintained a constant activity at a 70% 4-chlorophenol conversion once the steady state was reached. This suggests that the AC supported catalyst is less susceptible to the chloride poisoning produced during the reaction. [Copyright &y& Elsevier]
- Published
- 2011
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