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Issue 6, 2012
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Ruthenium nanoparticlecatalysts stabilized in phosphonium and imidazolium ionic liquids: dependence of catalyst stability and activity on the ionicity of the ionic liquid

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Abstract

Ruthenium nanoparticles (Ru NPs) were synthesized from the reduction of Ru(2-methylallyl)2(cod) under an atmosphere of H2(g) in a series of phosphonium and imidazolium ionic liquids (ILs): [P4,4,4,1]NTf2, [P4,4,4,8]NTf2, [P4,4,4,14]X (for X = NTf2, OTf, PF6), [BMI]NTf2 and [BDMI]NTf2. The Ru NPs embedded in each of these ILs were used as biphasic hydrogenation catalysts for the reduction of cyclohexene. The properties of the NPs, in terms of NP stability and catalytic activity, were dependent on the nature of the IL and these differences were rationalized through a Walden plot analysis of the IL ionicity. This analysis supports the idea that the formation of ion associations, in terms of ion-pairs or supramolecular aggregates, plays a key role in IL stabilization of metal NPs. A correlation between this stabilization mechanism and the NP stability and catalytic activity is hypothesized.

Graphical abstract: Ruthenium nanoparticle catalysts stabilized in phosphonium and imidazolium ionic liquids: dependence of catalyst stability and activity on the ionicity of the ionic liquid

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Publication details

The article was received on 17 Feb 2012, accepted on 21 Mar 2012 and first published on 23 Mar 2012


Article type: Paper
DOI: 10.1039/C2GC35241A
Green Chem., 2012,14, 1736-1742

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    Ruthenium nanoparticle catalysts stabilized in phosphonium and imidazolium ionic liquids: dependence of catalyst stability and activity on the ionicity of the ionic liquid

    K. L. Luska and A. Moores, Green Chem., 2012, 14, 1736
    DOI: 10.1039/C2GC35241A

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