Kinetics of nitrobenzene hydrogenation using a gel entrapped palladium catalyst

Autor: Garry L. Rempel, S. B. Tong, Kenneth F. O'Driscoll
Rok vydání: 1978
Předmět:
Zdroj: The Canadian Journal of Chemical Engineering. 56:340-345
ISSN: 1939-019X
0008-4034
DOI: 10.1002/cjce.5450560311
Popis: Palladium metal has been precipitated in a gel formed by the crosslinking polymerization of 2-hydroxyethylmethacrylate. The metal particles were found to have an average size of 14 nm. The dried polymer gel contained 1.38% Pd; it was crushed and sieved to give gel particles ca 200 μm in size. When the gel containing Pd was swollen by a solvent, catalytic activity toward the quantitative hydrogenation of nitrobenezene to aniline was observed. A detailed study of the kinetics of this hydrogenation revealed that at 101 kPa pressure and 31°C, resistance to the reaction was approximately equally divided between extra-particle mass transfer and the chemical activity of the Pd. The high activity of this novel catalyst is attributed to the large surface of the Pd and the extensive swelling of the gel by the reaction medium. On a precipite le palladium a l'etat metallique dans un gel forme par la polymerisation avec liaisons transversales du 2-hydroxyethylmethacrylate; on a trouve que les particules metalliques avaient une dimension moyenne de 14 millimetres. Le polymere-gel seche contenait 1.38% de palladium; on l'a broye et tamise, ce qui a eu comme resultat la production de particules de gel d'environ 200 μm. En gonflant le gel contenant le palladium au moyen d'un solvant, on a observe une activite catalytique tendant a l'hydrogenation quantitative du nitrobenzene en aniline. Une etude detaillee de la cinetique de ladite hydrogenation a reveve qu' une pression absolue de 101 kP et une temperature de 31°C, la resistance a la reaction etait a peu pres repartie egalement entre le transfert de masse de particules additionnelles et l'activite chimique du palladium. On attribue l'activite considerable du nouveau catalyseur a la surface considerable du palladium et au gonflement pousse du gel par l'agent de reaction.
Databáze: OpenAIRE
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