Formation and Growth of Pd Nanoparticles Inside a Highly Cross-Linked Polystyrene Support: Role of the Reducing Agent

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• 作者：Elena Groppo ; Giovanni Agostini ; Elisa Borfecchia ; Liu Wei ; Francesco Giannici ; Giuseppe Portale ; Alessandro Longo ; Carlo Lamberti
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：April 24, 2014
• 年：2014
• 卷：118
• 期：16
• 页码：8406-8415
• 全文大小：446K
• 年卷期：v.118,no.16(April 24, 2014)
• ISSN：1932-7455

文摘

Simultaneous time-resolved SAXS and XANES techniques were employed to follow in situ the formation of Pd nanoparticles in a porous polystyrene support, using palladium acetate as a precursor and gaseous H₂ or CO as reducing agents. These results, in conjunction with data obtained by diffuse reflectance UV鈥搗is and DRIFT spectroscopy and TEM measurements, allowed unraveling of the different roles played by gaseous H₂ and CO in the formation of the Pd nanoparticles. In particular, it was found that the reducing agent affects (i) the reduction rate (which is faster in the presence of CO) and (ii) the properties of the hosted nanoparticles, in terms of size (bigger with CO), morphology (spherical with H₂, triangular-like with CO), and surface properties (unclean with CO). The importance of a multitechnique approach in following the whole process of metal nanoparticles formation clearly emerges.