Three-phase nitrobenzene hydrogenation over supported glass fiber catalysts: reaction kinetics study

The catalytic properties of Pd and Pt supported on woven glass fibers (GF) were investigated in the three-phase hydrogenation of nitrobenzene (NB). Over all catalysts, a 100% yield of aniline was attained. The catalytic activity for the best catalysts was two times higher than the activity of com. Pt/C catalyst traditionally used for liq.-phase hydrogenation. The intrinsic reaction kinetics were studied and a reaction scheme is suggested. The direct formation of aniline from NB was obsd. over Pd/GF with traces of intermediates. Four intermediate products were detected during aniline formation over Pt/GF: nitrosobenzene, phenylhydroxylamine, azoxybenzene, and azobenzene. The Eley-Rideal kinetic model fits the exptl. data well. The parameters of the model were detd. as a function of initial NB concn. and hydrogen pressure. Pt and Pd supported on GF in woven fabrics are suggested as suitable materials for reactors with a structured catalytic bed in multiphase reactor performance. [on SciFinder (R)]


Published in:
Chemical Engineering & Technology, 23, 3, 251-255
Year:
2000
Keywords:
Note:
CAN 132:307978
22-7
Physical Organic Chemistry
Laboratory of Chemical Engineering,Swiss Federal Institute of Technology Lausanne,Lausanne,Switz.
Journal
0930-7516
written in English.
7440-05-3 (Palladium); 7440-06-4 (Platinum) Role: CAT (Catalyst use), USES (Uses) (three-phase nitrobenzene hydrogenation over supported glass fiber catalysts); 98-95-3 (Nitrobenzene) Role: RCT (Reactant), RACT (Reactant or reagent) (three-phase nitrobenzene hydrogenation over supported glass fiber catalysts); 100-65-2P (Phenylhydroxylamine); 103-33-3P (Azobenzene); 495-48-7P (Azoxybenzene); 586-96-9P (Nitrosobenzene) Role: RCT (Reactant), SPN (Synthetic preparation), PREP (Preparation), RACT (Reactant or reagent) (three-phase nitrobenzene hydrogenation over supported glass fiber catalysts); 62-53-3P (Aniline) Role: SPN (Synthetic preparation), PREP (Preparation) (three-phase nitrobenzene hydrogenation over supported glass fiber catalysts)
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 Record created 2006-04-18, last modified 2018-03-17

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