| 软模板法六边形纳米Pd粒子的超声制备与表征 |
| Hexagonal Nano-Pd Particles: Sonochemical Preparation by Soft-Template Method and Characterization |
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| 摘要: 在微量十六烷基三甲基溴化铵(CTAB)存在下，超声还原PdCl2水溶液，没有气氛保护且不加还原剂制得了纳米Pd粒子，用XRD、TEM、选区电子衍射(SAED)、UV、HRTEM和低温氮吸附-脱附等进行了表征。结果表明，纳米Pd晶粒的粒径分布集中，约为8 nm，呈六边形，(111)晶面的晶面间距为0.22 nm，晶格条纹清晰均匀。研究了纳米粒子的生长过程，揭示了NR4X-Pd2+配合物的生成，分析了可能的超声反应机理。利用CTAB模板控制得到的纳米粒子比未添加CTAB样品的比表面积增大了10 m2·g-1，有利于催化性能的提高。 |
| 关键词: 钯 纳米粒子 表面活性剂 模板合成 |
| 基金项目: |
| Abstract: Nano-Pd particles were prepared using ultrasonics without gas protection and reductant in the palladium(Ⅱ) chloride aqueous solution by the addition of a small quantity of hexadecyl trimethyl ammonium bromide(CTAB). The samples were characterized by XRD, TEM, Selected Area Electron Diffraction (SAED), UV, HRTEM and low temperature nitrogen adsorption-desorption. The results indicate that the hexagonal nano-Pd particles with a narrow distributed size of 8 nm were observed. The nanoparticles prepared exhibit clearly resolved lattice fringes with an interplanar spacing of 0.22 nm assigned to the (111) plane of the cubic Pd structure. The growth process of palladium nanoparticles were studied and the formation of a NR4X-Pd2+ complex were also indicated. Furthermore, the formation mechanism was discussed as well. The nanoparticles obtained by addition of CTAB increase the BET surface area by 10 m2·g-1 compared to that obtained without surfactant, thus improving the catalytic performance. |
| Keywords: palladium nanoparticles surfactants template synthesis |
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| 王艳丽,张明旭,李本侠,王晓宇.软模板法六边形纳米Pd粒子的超声制备与表征[J].无机化学学报,2011,27(10):1914-1918. |
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