Synthesis of Pd particles with various shapes by ionic
liquids for HFP hydrogenation catalyst
Chang Soo Kim
Kye Sang Yoo
Received: 20 September 2012 / Accepted: 30 November 2012 / Published online: 22 May 2014
Ó Springer Science+Business Media Dordrecht 2014
Abstract Palladium particles were simply synthesized using various ionic liquids.
The morphology of the particles was signiﬁcantly affected by the anion parts of the
ionic liquids. Among the ionic liquids, hexaﬂuorophosphate as an anion part was
more effective in forming the palladium particles with relatively small and narrow
size distribution. However, irregularly shaped palladium particles were synthesized
without ionic liquid assistance. For a hexaﬂuoropropylene hydrogenation to produce
hydroﬂuorocarbons, palladium was impregnated on a carbon powder as a catalyst.
During the preparation of the catalyst, ionic liquids were added to control the shape
of the palladium on the support. After calcinations at 500 °C, all catalysts possessed
the comparable crystal structure. Under identical reaction conditions, the catalyst
prepared using 1-hexyl-3-methylimidazolium hexaﬂuorophosphate was the most
effective in this reaction. Hence, catalytic activity was mainly determined by the
size of the palladium particles.
Keywords Palladium particles Á Ionic liquid Á Shape control Á HFP
Palladium plays essential roles in hydrogen storage, sensing, and catalysts [1–4].
Especially, the size and shape of the Pd particles are crucial parameters in
C. S. Kim
Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 136-791,
K. S. Yoo (&)
Department of Chemical & Biomolecular Engineering, Seoul National University of Science and
Technology, Seoul 139-743, South Korea
Res Chem Intermed (2014) 40:2471–2476