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The microwave-assisted ionic liquid nanocomposite synthesis: platinum nanoparticles on graphene and the application on hydrogenation of styrene

Jer-Yeu Lee12, Tung-Yuan Yung345* and Ling-Kang Liu1234*

Author Affiliations

1 Department of Chemistry, Academia Sinica, 1 Roosevelt Road Section 4, Taipei 106, Taiwan

2 Institute of Chemistry, Academia Sinica, 128 Academia Road Section 2, Nankang, Taipei 115, Taiwan

3 Department of Physics, National Central University, 300 Jhongda Road, Jhongli, Taoyuan 320, Taiwan

4 Molecular Science and Technology, Taiwan International Graduate Program, Academia Sinica, 128 Academia Road Section 2, Nankang, Taipei 115, Taiwan

5 Nuclear Fuels and Materials Division, Institute of Nuclear Energy Research, 1000 Wenhua Road, Longtan, Taoyuan 325, Taiwan

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Nanoscale Research Letters 2013, 8:414  doi:10.1186/1556-276X-8-414

Published: 8 October 2013

Abstract

The microwave-assisted nanocomposite synthesis of metal nanoparticles on graphene or graphite oxide was introduced in this research. With microwave assistance, the Pt nanoparticles on graphene/graphite oxide were successfully produced in the ionic liquid of 2-hydroxyethanaminium formate [HOCH2CH2NH3][HCO2]. On graphene/graphite oxide, the sizes of Pt nanoparticles were about 5 to 30 nm from transmitted electron microscopy (TEM) results. The crystalline Pt structures were examined by X-ray diffraction (XRD). Since hydrogenation of styrene is one of the important well-known chemical reactions, herein, we demonstrated then the catalytic hydrogenation capability of the Pt nanoparticles on graphene/graphite oxide for the nanocomposite to compare with that of the commercial catalysts (Pt/C and Pd/C, 10 wt.% metal catalysts on activated carbon from Strem chemicals, Inc.). The conversions with the Pt nanoparticles on graphene are >99% from styrene to ethyl benzene at 100°C and under 140 psi H2 atmosphere. However, ethyl cyclohexane could be found as a side product at 100°C and under 1,520 psi H2 atmosphere utilizing the same nanocomposite catalyst.

Keywords:
Graphene; Pt nanoparticle; Ionic liquid; Microwave; Hydrogenation of styrene