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Ultra-selective gas phase catalytic hydrogenation of aromatic nitro compounds over Au/Al2O3

Paper ID Volume ID Publish Year Pages File Format Full-Text
52081 46864 2008 7 PDF Available
Title
Ultra-selective gas phase catalytic hydrogenation of aromatic nitro compounds over Au/Al2O3
Abstract

We report, for the first time, the exclusive (and time invariant) gas phase hydrogenation of p-chloronitrobenzene to p-chloroaniline over Au/Al2O3 where 393 K ⩽ T ⩽ 523 K (ΔEa = 49 kJ mol−1). Under the same conditions, Pd/Al2O3 promoted the formation of nitrobenzene and aniline, i.e. composite hydrodechlorination and hydrogenation. Reaction over Au–Pd/Al2O3 delivered equivalent activity/selectivity to that obtained with Pd/Al2O3. Temperature programmed reduction analysis and hydrogen uptake measurements suggest there is negligible Au–Pd interaction in the bimetallic. Exclusive formation of the corresponding haloaniline is also demonstrated over Au/Al2O3 for a series of mono- and di-substituted halonitroarenes; the activity sequence is consistent with electron withdrawing substituent activation.

Keywords
Selective hydrogenation; Halonitroarene; Au/Al2O3; Au–Pd/Al2O3
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Ultra-selective gas phase catalytic hydrogenation of aromatic nitro compounds over Au/Al2O3
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 9, Issue 3, 1 March 2008, Pages 475–481
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us