✦ LIBER ✦
Poisoning of Pd–carbon catalysts by sulphur, chloro and heavy metal compounds in liquid phase hydrogenation of o-nitrophenol to o-aminophenol
✍ Scribed by Vasant R. Choudhary; Mukund G. Sane
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1998
- Tongue
- English
- Weight
- 102 KB
- Volume
- 73
- Category
- Article
- ISSN
- 0268-2575
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✦ Synopsis
The poisoning of PdÈcarbon (4É1% Pd) catalysts by thiophene, dichloroethane, mercuric chloride and lead, zinc and mercuric acetates at di †erent concentrations (0È5000 g m~3) in the liquid phase hydrogenation of onitrophenol to o-aminophenol (at 308 K and pressure of 1508 kPa) in a H 2 three-phase stirred slurry reactor has been investigated. The hydrogenation activity of the catalyst is drastically reduced due to the presence of these poisons in the reaction mixture, even at a very low concentration of poison (20 g m~3). Among the poisons, mercuric acetate was found to be the most potent. 1998