Ligand-free Gold Nanoparticles as a Reference Material for Kinetic Modelling of Catalytic Reduction of 4-Nitrophenol
Ligand-free Gold Nanoparticles as a Reference Material for Kinetic Modelling of Catalytic Reduction of 4-Nitrophenol
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DOI：
10.1007/s10562-015-1514-7
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发表时间：
2015-05-01
影响因子：
2.8
通讯作者：
Wagener, Philipp
中科院分区：
文献类型：
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作者：
Gu, Sasa;Kaiser, Julian;Wagener, Philipp
用硼氢化钠还原4-硝基苯酚是测试金属纳米粒子催化活性的常用模型反应。由于所有的反应步骤都只在金属纳米粒子(朗缪尔-辛谢尔伍德模型)的表面进行，金属纳米粒子的配体覆盖阻碍了理论和实验的融合。因此，我们分析了在没有任何稳定剂或配体的情况下，激光烧蚀法制备的裸金纳米粒子在液体中的催化活性。以4-羟基氨基苯酚为中间物种，对催化反应进行了全动力学分析。理论和实验之间有很好的一致性。此外，纳米颗粒的悬浮液保持稳定。因此，无配体纳米颗粒可以作为催化反应机理研究的参考材料。此外，分析表明，激光烧蚀合成的金纳米粒子是该反应最活跃的催化剂之一。
The reduction of 4-nitrophenol by sodium borohydride is a common model reaction to test the catalytic activity of metal nanoparticles. As all reaction steps proceed solely on the surface of the metal nanoparticles (Langmuir-Hinshelwood model), ligand-coverage of metal nanoparticles impedes the merging of theory and experiment. Therefore we analyzed the catalytic activity of bare gold nanoparticles prepared by laser ablation in liquid without any stabilizers or ligands. The catalytic reaction is characterized by a full kinetic analysis including 4-hydroxylaminophenol as an intermediate species. Excellent agreement between theory and experiment is found. Moreover, the suspension of the nanoparticles remains stable. Hence, ligand-free nanoparticles can be used as a reference material for mechanistic studies of catalytic reactions. In addition, the analysis shows that gold nanoparticles synthesized by laser ablation are among the most active catalysts for this reaction.[GRAPHICS].