Reaction Kinetics, Mechanisms and Catalysis
Volume/Issue:
Volume 105: Issue 2
Kinetics and mechanism of the hydrogenation of m-dinitrobenzene to m-phenylenediamine
Authors:
Hugo Rojas Grupo de Catálisis (GC-UPTC) Universidad Pedagógica y Tecnológica de Colombia, Escuela de Química, Facultad de Ciencias, Av. Norte, Tunja, Colombia

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Gloria Borda Grupo de Catálisis (GC-UPTC) Universidad Pedagógica y Tecnológica de Colombia, Escuela de Química, Facultad de Ciencias, Av. Norte, Tunja, Colombia

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María Brijaldo Grupo de Catálisis (GC-UPTC) Universidad Pedagógica y Tecnológica de Colombia, Escuela de Química, Facultad de Ciencias, Av. Norte, Tunja, Colombia

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Patricio Reyes Facultad de Ciencias Químicas, Universidad de Concepción, Casilla 160-C, Concepción, Chile, preyes@udec.cl

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Jesús Valencia Centro de Catálisis Heterogénea, Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia, Bogotá, Colombia, jsvalencia@unal.edu.co

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Pages:
271–284
Online Publication Date:
07 Oct 2011
Publication Date:
01 Apr 2012
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s11144-011-0380-6
Keywords:
m-Dinitrobenzene; Hydrogenation; Catalyst; Initial rate; Kinetic study
Restricted access

Abstract

The hydrogenation of m-dinitrobenzene to m-phenylenediamine was carried out as a model hydrogenation reaction of importance to the pharmaceutical and fine chemicals industries with the aim of investigating the kinetics of the reaction. The effect of different conditions: hydrogen pressure, m-dinitrobenzene concentration, reaction temperature, and weight of catalyst on the conversion of m-dinitrobenzene and the yield of m-phenylenediamine were studied using Pt/TiO2 catalyst. During the kinetic study, the intermediate m-nitroaniline was detected. Therefore, the overall reaction was treated as consecutive reactions: first the reduction of m-dinitrobenzene to m-nitroaniline and then, the reduction of m-nitroaniline to m-phenylenediamine. The apparent activation energies of the reaction were determined in each step, to be 33.4 ± 0.4 and 39.8 ± 0.6 kJ/mol. Those results indicated that the hydrogenation of m-nitroaniline toward m-phenylenediamine is the rate determining step in the hydrogenation of m-dinitrobenzene. Two rate equations assuming Langmuir–Hinshelwood mechanism provided the best fit to the experimental data.

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Cover Reaction Kinetics, Mechanisms and Catalysis
Reaction Kinetics, Mechanisms and Catalysis
Print ISSN:
1878-5190
Online ISSN:
1878-5204

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Reaction Kinetics, Mechanisms and Catalysis
Language English
Size B5
Year of
Foundation		 1974
Volumes
per Year		 1
Issues
per Year		 6
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1878-5190 (Print)
ISSN 1878-5204 (Online)

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