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Catalytic HDC/HDN of 4-chloronitrobenzene in water under ambient-like conditions with Pd supported on pillared clay

Paper ID Volume ID Publish Year Pages File Format Full-Text
45868 46426 2014 7 PDF Available
Title
Catalytic HDC/HDN of 4-chloronitrobenzene in water under ambient-like conditions with Pd supported on pillared clay
Abstract

•The Pd/pillared clay catalyst led to complete dechlorination of 4-chloronitrobenzene and 4-chloroaniline.•The catalyst showed high activity in denitrogenation at ambient-like operating conditions.•Acid pH is optimal for aniline denitrogenation and prevents catalyst poisoning from ammonia.•The catalyst showed high stability in long-term experiments.

Hydrotreatment of 4-chloronitrobenzene in aqueous phase has been carried out under ambient-like operating conditions (25 °C and 1 atm) with H2 using an own-prepared catalyst based on Pd (1 wt%) supported on Al-pillared clay. Nitrobenzene, 4-chloroaniline, aniline and cyclohexanone were identified as reaction byproducts and trace amounts of different azobenzenes were also detected. Complete dechlorination was achieved in around 1.5 h reaction time. Experiments with the aforementioned nitrogenated byproducts were performed to elucidate the reaction pathway. Nitrobenzene was completely converted in short reaction time leading to aniline as main product. Disappearance of 4-chloroaniline was complete after 1 h giving rise to aniline as primary product. An unstable imine/enamine was obtained from aniline, yielding cyclohexanone upon reaction with water. Hydrodenitrogenation of aniline was favored at acidic pH, being released more than 85% N after 10 h. A kinetic analysis is included and values of activation energy are given.

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Keywords
Hydrodechlorination; Hydrodenitrogenation; Chloronitrobenzene; Nitrobenzene; Chloroaniline; Aniline; Pd; Pillared clays
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Catalytic HDC/HDN of 4-chloronitrobenzene in water under ambient-like conditions with Pd supported on pillared clay
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 158–159, October 2014, Pages 175–181
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