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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Hydrogenation of p-chloronitrobenzene over NiPtB nanoalloy catalysts
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Hydrogenation of p-chloronitrobenzene over NiPtB nanoalloy catalysts

机译：NiPtB纳米合金催化剂上对氯硝基苯的加氢

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摘要

NiPtB nanoalloy catalysts with various Ni contents were prepared by chemical reduction method at room temperature using NaBH4 as reducing agent. Pt and Ni cations were completely reduced to metals, and small amount of boron was also reduced and form alloy with metals. NiPtB formed nanosized alloy struc_ture and X-ray diffraction patterns showed its amorphous nature. The particle size distribution and the surface composition were affected by Ni/Pt ratio in the starting materials and the temperature of heat treatment. The catalytic activity of the nanoalloys was tested for hydrogenation of p-chloronitrobenzene (p-CNB). The activity and selectivity to p-chloroaniline (p-CAN) were affected by the content of Ni in the catalyst. For NiPt_(0.01)B catalyst, the occurrence of surface segregation of B was driven by the strain energy at high reaction temperature. For NiPt_(0.03)B and NiPt_(0.01)B catalysts, Pt segregated to the surface by H_2 affinity. Ni/Pt ratio decreased as the reaction temperature increased. The activity was essentially affected by the addition of Ni on Pt in the NiPtB catalyst, as expected, because Pt is more active than Ni for this reaction. The hydrogenation of p-CNB was very selective and yielded p-CAN exclusively on NiPtB cata_lysts than that on Pt catalyst.
机译：以NaBH4为还原剂，在室温下通过化学还原法制备了各种Ni含量的NiPtB纳米合金催化剂。 Pt和Ni阳离子被完全还原为金属，少量的硼也被还原并与金属形成合金。 NiPtB形成的纳米合金结构，X射线衍射图表明其为非晶态。粒径分布和表面组成受原料中Ni / Pt比和热处理温度的影响。测试了纳米合金对对氯硝基苯（p-CNB）的催化活性。催化剂中Ni的含量会影响对氯苯胺（p-CAN）的活性和选择性。对于NiPt_（0.01）B催化剂，B的表面偏析的发生是由高反应温度下的应变能驱动的。对于NiPt_（0.03）B和NiPt_（0.01）B催化剂，Pt通过H_2亲和力分离到表面。 Ni / Pt比随着反应温度的升高而降低。如所预期的，活性基本上受NiPtB催化剂中Pt上添加Ni的影响，因为在该反应中Pt比Ni更具活性。对-CNB的加氢非常有选择性，在NiPtB催化剂上比在Pt催化剂上只生成p-CAN。

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