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Issue 11, 2017
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Fabrication of highly dispersed/active ultrafine Pd nanoparticle supported catalysts: a facile solvent-free in situ dispersion/reduction method

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Abstract

The development of sustainable routes for the synthesis of noble metal supported catalysts is of high importance because of their wide applications on a large scale in the catalysis field. Herein we report a facile solvent-free solid-state dispersion route to fabricate highly dispersed ultrafine palladium nanoparticle supported catalysts. In the first step, a noble metal precursor Pd(acac)2 was dispersed spontaneously by treating the physical mixture of Pd(acac)2 and catalyst support hydroxyapatite (HAP) at 120 °C under a flow of N2. Subsequent H2 reduction results in the formation of two kinds of Pd particles. In situ reduction at 120 °C is essential for preparing highly dispersed Pd nanoparticles (∼1.2 nm, a1Pd/HAP-SSD) and cooling-down reduction leads to the formation of larger Pd nanoparticles (∼4 nm, b1Pd/HAP-SSD). The as-prepared a1Pd/HAP-SSD exhibits higher activity for phenol hydrogenation than b1Pd/HAP-SSD and that obtained by a traditional wet impregnation method, due to the highly dispersed ultrafine Pd0 nanoparticles obtained by in situ dispersion/reduction. Compared with conventional wet chemistry-based methods, the synthesis route in this work simplifies the synthesis process, avoids producing large polluted wastes, and enhances the dispersion of noble metals. This may open a new way to prepare highly dispersed/active noble metal supported catalysts and is also potentially of high importance for the green production of noble metal supported catalysts on a large scale in the future.

Graphical abstract: Fabrication of highly dispersed/active ultrafine Pd nanoparticle supported catalysts: a facile solvent-free in situ dispersion/reduction method

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Publication details

The article was received on 21 Jan 2017, accepted on 21 Apr 2017 and first published on 24 Apr 2017


Article type: Paper
DOI: 10.1039/C7GC00262A
Citation: Green Chem., 2017,19, 2646-2652
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    Fabrication of highly dispersed/active ultrafine Pd nanoparticle supported catalysts: a facile solvent-free in situ dispersion/reduction method

    Y. Shen, X. Bo, Z. Tian, Y. Wang, X. Guo, M. Xie, F. Gao, M. Lin, X. Guo and W. Ding, Green Chem., 2017, 19, 2646
    DOI: 10.1039/C7GC00262A

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