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Ni-based structured catalyst for selective 3-phase hydrogenation of nitroaromatics

Paper ID Volume ID Publish Year Pages File Format Full-Text
53243 46955 2016 8 PDF Available
Title
Ni-based structured catalyst for selective 3-phase hydrogenation of nitroaromatics
Abstract

•Ni-based catalyst using activated carbon fibres (ACF) as structured support.•Metallic Ni° (∼2 nm) formation confirmed by TPR, XRD, XPS and STEM analysis.•Up to 99% yield p‐chloroaniline achieved in hydrogenation of p-chloronitrobenzene.•Ni/ACF is 3-fold more active as compared to benchmark Raney nickel.

We report herein on the development of Ni-based catalyst using activated carbon fibres (ACFs) as a structured support and its application for the three‐phase hydrogenation of nitroarenes (T = 353 K; P = 10 bar). It was shown that metallic Ni0 nanoparticles (NPs) with a mean diameter of ∼2.0 nm stabilized by the ACF microporous network were responsible for the catalytic transformation. To obtain optimum catalytic activity, the Ni/ACF catalyst must be freshly prepared and activated in situ by H2 at T > 353 K. Pre-treatment of the ACFs by nitric acid boosted the activity of the Ni/ACF catalyst, which exhibits high performance in hydrogenation of nitrobenzene to aniline (yield, Y ∼100%). The catalyst was tested for the reuse attaining a quasi-steady-state after the sixth reaction thereafter remaining relatively stable over seven consecutive runs. Near-quantitative transformation (Y > 99%) of p-chloronitrobenzene to p‐chloroaniline was achieved under mild conditions over the Ni/ACF catalyst with a ca. 20-fold higher activity than conventional Raney Ni. Thus, new catalyst reported here represents a significant step forward towards a simple, heterogeneous catalytic selective hydrogenation of nitroarenes that employs H2 as the hydrogen source.

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Keywords
Selective hydrogenation; Nitrobenzene; p-Chloroaniline; Ni nanoparticles; Activated carbon fibres; Structured catalyst
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Ni-based structured catalyst for selective 3-phase hydrogenation of nitroaromatics
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 273, 15 September 2016, Pages 244–251
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
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