Large-Scale Synthesis and CO Oxidation Study of FeCr Alloy Supported Pt Nanocatalyst by Electrical Wire Explosion Proces
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Large-Scale Synthesis and CO Oxidation Study of FeCr Alloy Supported Pt Nanocatalyst by Electrical Wire Explosion Process Jung Yeul Yun • A. Satyanarayana Reddy • Sangsun Yang Hyeon Ju Kim • Hye Young Koo • Hye Moon Lee • Chan Ho Jung • Kamran Qadir • Sunmi Kim • Jeong Young Park
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Received: 10 August 2011 / Accepted: 6 January 2012 / Published online: 31 January 2012 Ó Springer Science+Business Media, LLC 2012
Abstract Platinum nanoparticles supported on FeCr alloy have been synthesized at a large-scale by sequential electrical explosion of FeCr alloy and Pt wires in ethanol. X-ray diffraction showed corresponding peaks of nonoxide phase Pt and FeCr alloy nanoparticles. Transmission electron microscopy showed uniform dispersion of Pt nanoparticles on the support with an average size of 2 nm and high thermal stability up to 600 °C. These Pt-FeCr alloy nanoparticles were found to be active for CO oxidation with an activation energy of 15 kcal mol-1 and negligible deactivation. This work demonstrated the application of the electrical wire explosion process for synthesis of supported metal catalysts with high thermal stability and activity. Keywords Electrical wire explosion Pt–Fe nanoparticles Nanocatalyst CO oxidation
1 Introduction Recently, the demand for rapid large-scale synthesis of nanomaterials by effective and low-cost methods has increased due to potential applications in nanotechnology and catalysis [1, 2]. To obtain higher catalytic activity, a high dispersion of metal nanoparticles on the support J. Y. Yun (&) S. Yang H. J. Kim H. Y. Koo H. M. Lee Functional Materials Division, Korea Institute of Materials Science (KIMS), Chang-won 641-831, South Korea e-mail: [email protected] A. S. Reddy C. H. Jung K. Qadir S. Kim J. Y. Park (&) Graduate School of EEWS (WCU), and NanoCentury KI, KAIST, Daejeon 305-701, South Korea e-mail: [email protected]
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material is desired, where metal oxides are commonly used as support materials. The use of metal/alloys provides high thermal stability due to the strong chemical bonds that form between the alloy and the active metal on the surface [3–7]. The use of metal nanoparticles in high temperature catalytic reactions has prompted great attention to be paid to the synthesis of thermally stable nanocatalysts [8, 9]. The overall performance of a supported metal nanocatalyst depends highly on the size and shape of the nanoparticles, the structure and properties of the oxide supports, and metal-oxide interactions [4, 10]. Most common techniques used to prepare oxide-supported nanoparticles include co-precipitation and deposition precipitation [11, 12]. All of the conventional synthesis methods use an organic capping agent to control the size and shape of the active metal or support nanoparticles. Nanoparticles with capping layers are not suitable for high temperature ([300 °C) reactions, such as CO oxidation [8], partial oxidation [13], hydrocarbon cracking [14], combustion [15], and ignition behavior studies [16], as the capping molecules deco
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