Poisoning of Pd–carbon catalysts by sulphur, chloro and heavy metal compounds in liquid phase hydrogenation of o-nitrophenol to o-aminophenol

Autor:	Choudhary, Vasant R., Sane, Mukund G.
Zdroj:	Journal of Chemical Technology & Biotechnology; December 1998, Vol. 73 Issue: 4 p336-340, 5p
Abstrakt:	The poisoning of Pd–carbon (4·1% Pd) catalysts by thiophene, dichloroethane, mercuric chloride and lead, zinc and mercuric acetates at different concentrations (0–5000 g m−3) in the liquid phase hydrogenation of o-nitrophenol to o-aminophenol (at 308 K and H2 pressure of 1508 kPa) in a 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 Society of Chemical Industry
Databáze:	Supplemental Index
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