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Ir supported over carbon materials for the selective hydrogenation of chloronitrobenzenes

Paper ID Volume ID Publish Year Pages File Format Full-Text
53711 46981 2015 7 PDF Available
Title
Ir supported over carbon materials for the selective hydrogenation of chloronitrobenzenes
Abstract

•Ir catalysts supported on carbon materials with different graphitic character.•The effect of oxygen groups in carbon nanotubes has been evaluated.•Ir/CNT shows the best catalytic performance in p-chloronitrobenzene hydrogenation.•The reactivity of different isomers on Ir/CNT was m > o > p.

In the present work we have studied the effect of carbon supports with different graphitic character (carbon nanotubes, mesoporous graphite and activated carbon) on the catalytic performance of iridium nanoparticles on the liquid phase chemoselective hydrogenation of para-chloronitrobenzene at room temperature. The effect of the oxygen groups was also evaluated by oxidizing a portion of the carbon nanotubes. The Raman and XRD spectra showed that the mesoporous graphite displayed the strongest graphitic character. The characterization of the catalysts by HR-TEM, XPS and TPR-H2, showed that the catalysts had similar particle size and that the catalysts prepared over the previously oxidized support, Ir/CNTox, was not fully reduced. The activity and selectivity achieved with the catalyst Ir/CNT was the best among the samples and the presence of irdium oxide on Ir/CNTox diminished the yield to p-chloroaniline, being the worse catalyst. The reactivity of different isomers was also studied over Ir/CNT and it followed the order m > o > p.

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Keywords
Iridium; Graphitic character; Nitrobenzene hydrogenation
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Ir supported over carbon materials for the selective hydrogenation of chloronitrobenzenes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 249, 1 July 2015, Pages 72–78
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
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