An electroless deposition technique for the synthesis of highly active and nano-sized Pd particles on silica nanosphere
An electroless deposition technique for the synthesis of highly active and nano-sized Pd particles on silica nanosphere
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DOI：
10.1016/j.cattod.2011.08.014
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发表时间：
2012-05
期刊：
影响因子：
5.3
通讯作者：
Shusuke Okada;T. Kamegawa;K. Mori;H. Yamashita
中科院分区：
文献类型：
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作者：
Shusuke Okada;T. Kamegawa;K. Mori;H. Yamashita
利用Sn2+离子化学沉积技术，将Pd前驱体直接与Sn2+离子相互作用，然后转化为Pd纳米粒子，建立了一种在二氧化硅载体上制备均匀纳米级Pd粒子的简单方法。透射电子显微镜分析表明，与常规浸渍法制备的Pd纳米颗粒(Imp-Pd/SiO_2)相比，化学沉积法制备的Pd纳米颗粒尺寸均匀，尺寸较小。研究了它们对硝基苯加氢反应和H_2O_2和H_2O_2直接合成H_2O_2的催化性能，结果表明，采用化学沉积技术制备的LD-Pd/SiO_2(SnO_2)催化剂的催化活性明显好于IMP-Pd/SiO_2催化剂，这是因为它具有均匀的纳米Pd颗粒。
A simple methodology to synthesize uniform and nano-sized Pd particles supported on silica support has been developed by the electroless deposition technique using Sn2+ion, in which Pd precursor can be interacted directly with the Sn2+ion, and subsequently transformed into Pd nanoparticles. Characterization by TEM analysis proved that the sizes of the Pd nanoparticles using the electroless deposition technique (eld-Pd/SiO2(Sn)) were quite uniform with smaller size compared with that prepared by the conventional impregnation method (imp-Pd/SiO2). Their catalytic applications for the hydrogenation of nitrobenzene and the direct synthesis of H2O2from H2and O2gases were investigated and it is demonstrated that eld-Pd/SiO2(Sn) prepared by the electroless deposition technique was shown to perform significantly better activity than the imp-Pd/SiO2owing to its uniform and nano-sized Pd particles.