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首页> 外文期刊>RSC Advances >Influence of Ni on enhanced catalytic activity of Cu/Co3O4 towards reduction of nitroaromatic compounds: studies on the reduction kinetics
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Influence of Ni on enhanced catalytic activity of Cu/Co3O4 towards reduction of nitroaromatic compounds: studies on the reduction kinetics

机译：Ni对Cu / Co3O4催化还原硝基芳族化合物的催化活性的影响：还原动力学的研究

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摘要

In this work, we have investigated the influence of Ni on Cu/Co3O4 towards catalytic reduction of nitroaromatic compounds. For this purpose, Cu, Ni and CuNi alloy nanoparticles supported over Co3O4 are synthesized by a surfactant aided co-reduction method. The Co3O4 support is synthesized via a template-free hydrothermal route. The Co3O4 support and CuNi/Co3O4 nanocatalysts are characterized by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), UV-visible spectroscopy and Brunauer-Emmett-Teller (BET) surface area techniques. The Co3O4 supported CuNi alloy nanoparticles exhibit superior catalytic performance for 4-nitrophenol (4-NP) reduction in comparison to the monometallic catalysts due to synergistic effects. Furthermore, the supported bimetallic nanoparticles demonstrate high recycling ability towards the reduction of 4-NP up to six cycles. To demonstrate the effectiveness of the highly active CuNi/Co3O4 nanocatalyst towards reduction of various nitroaromatics, the catalyst is also used for reduction of 4-nitroaniline, 4-nitrotoluene, 3-nitroaniline, and 2-nitroaniline. The presence of the CuNi/Co3O4 interfaces in the nanocatalyst is believed to be responsible for the high catalytic activity.
机译：在这项工作中，我们研究了Ni对Cu / Co3O4催化还原硝基芳族化合物的影响。为此，通过表面活性剂辅助共还原法合成了负载在Co3O4上的Cu，Ni和CuNi合金纳米颗粒。 Co3O4载体是通过无模板的水热路线合成的。 Co3O4载体和CuNi / Co3O4纳米催化剂的特征在于傅立叶变换红外光谱（FTIR），拉曼光谱，透射电子显微镜（TEM），能量色散X射线光谱（EDS），X射线衍射（XRD），紫外可见光光谱法和Brunauer-Emmett-Teller（BET）表面积技术。由于协同效应，与单金属催化剂相比，Co3O4负载的CuNi合金纳米颗粒显示出对4-硝基苯酚（4-NP）还原的优异催化性能。此外，负载的双金属纳米颗粒表现出高的回收能力，可以减少多达4个循环的4-NP。为了证明高活性CuNi / Co3O4纳米催化剂对还原各种硝基芳族化合物的有效性，该催化剂还用于还原4-硝基苯胺，4-硝基甲苯，3-硝基苯胺和2-硝基苯胺。纳米催化剂中CuNi / Co3O4界面的存在被认为是高催化活性的原因。

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