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Microemulsion-Controlled Synthesis of One-Dimensional Ir Nanowires and Their Catalytic Activity in Selective Hydrogenation of o-Chloronitrobenzene

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    Microemulsion-Controlled Synthesis of One-Dimensional Ir Nanowires and Their Catalytic Activity in Selective Hydrogenation of o-Chloronitrobenzene
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    † State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, P. R. China
    ‡ Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
    *E-mail [email protected]; Tel +86-411-84379680; Fax +86-411-84685940 (X.W.).
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    Cite this: Langmuir 2015, 31, 1, 90–95
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    https://doi.org/10.1021/la5040307
    Published December 16, 2014
    Copyright © 2014 American Chemical Society
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    Abstract

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    Ultrathin iridium nanowires have been synthesized using a convenient method mediated by microemulsion via oriented attachment growth for the first time. The interconnected polycrystalline Ir nanowires possess high aspect ratio, small average diameter of 2 nm, and length up to several hundred nanometers. The 1D growth of surfactant-encapsulated primary nanoparticles, which is determined by the inherent crystal growth habit and the specific interactions of nanocrystals with surfactant molecules, accounts for the formation of Ir nanowires. The as-prepared Ir nanowires show high activity and selectivity toward the hydrogenation production of industrially valuable chloroaniline from o-chloronitrobenzene. Theoretical evidence based on DFT calculation indicates that H2 could be dissociated more easily and quickly on Ir(100) surface than on Ir(111), accounting for the higher hydrogenation rate over Ir nanowires exposing both (200) and (111) crystal facets rather than only (111) facet for Ir nanoparticles.

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    Characterizations, additional TEM images, surfactants structures, XRD pattern, N2 adsorption/desesorption isotherms, and schematic illustration of formation mechanism. This material is available free of charge via the Internet at http://pubs.acs.org.

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    Langmuir

    Cite this: Langmuir 2015, 31, 1, 90–95
    Click to copy citationCitation copied!
    https://doi.org/10.1021/la5040307
    Published December 16, 2014
    Copyright © 2014 American Chemical Society
    Request reuse permissions

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