RuxPtySnzcluster-derived nanoparticle catalysts: spectroscopic investigation into the nature of active multinuclear single sites

Maela Manzoli; Vasudev N. Shetti; Jonathan A. L. Blaine; Lei Zhu; Derek Isrow; Veeranna Yempally; Burjor Captain; Salvatore Coluccia; Robert Raja; Enrica Gianotti

doi:10.1039/C1DT11243K

Ru_xPt_ySn_zcluster-derived nanoparticlecatalysts: spectroscopic investigation into the nature of active multinuclear single sites†

Maela Manzoli,*^a Vasudev N. Shetti,^a Jonathan A. L. Blaine,^b Lei Zhu,^c Derek Isrow,^c Veeranna Yempally,^c Burjor Captain,^c Salvatore Coluccia,^a Robert Raja^b and Enrica Gianotti^a

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^a Department of Chemistry IFM and NIS - Centre of Excellence, University of Torino, via P. Giuria 7, Torino, Italy
E-mail: maela.manzoli@unito.it

^b School of Chemistry, University of Southampton, Highfield,, Southampton, U.K.

^c Department of Chemistry, University of Miami, Coral Gables, Florida, USA

Abstract

Cluster-derived Ru_xPt_ySn_znanoparticles are active catalysts in the hydrogenation of nitrobenzene. The nature of the active sites has been elucidated by FTIR spectroscopy using CO and NO as probe molecules. A new metal carbonyl cluster precursor, Pt₂Ru₂(SnBu^t₃)₂(CO)₉(μ-H)₂, has been synthesized to obtain a Ru₂Pt₂Sn₂/SiO₂ catalyst, that displayed remarkably high levels of conversion and selectivities compared to other bi-and monometallic analogues. Spectroscopic comparisons with Ru₅PtSn/SiO₂ indicate that both the nature and the stoichiometry of the metals play a key role in modulating the catalytic activities and selectivities. A multinuclear single-site containing Pt centers, which facilitate the hydrogen activation, coupled with a highly reactive Ru site, possibly involved in the nitrobenzene activation, can be hypothesized. The oxophilicity of tin helps with the anchoring of the nanoparticles, aids the dispersion of the other metals, and can play an important role in influencing the selectivity to aniline.

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Ru_xPt_ySn_zcluster-derived nanoparticlecatalysts: spectroscopic investigation into the nature of active multinuclear single sites†

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Dalton Transactions

RuxPtySnzcluster-derived nanoparticlecatalysts: spectroscopic investigation into the nature of active multinuclear single sites†

Abstract

Supplementary files

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RuxPtySnzcluster-derived nanoparticle catalysts: spectroscopic investigation into the nature of active multinuclear single sites

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Ru_xPt_ySn_zcluster-derived nanoparticlecatalysts: spectroscopic investigation into the nature of active multinuclear single sites†

Ru_xPt_ySn_zcluster-derived nanoparticle catalysts: spectroscopic investigation into the nature of active multinuclear single sites