Nanoscale

Main content

The Copéret group develops and applies tailored organometallic precursors for the synthesis of monodispersed supported metal nanoparticles for applications in heterogeneous catalysis.

We investigate and compare three methodologies: classical impregnation, two-step grafting/post-treatment and colloid approaches.

Classical impregnation. Impregnating inorganic precursor including organometallic compounds onto tailored supports followed by post-treatment allows for the formation of narrowly dispersed small (1-2 nm) nanoparticles, which are typically active in a broad range of applications, e.g. hydrogenation, methanation1 and dry reforming.2,3

Grafting approach. Grafting tailored organometallic precursor onto silica or alumina surface allows for a precise control over the reaction stoichiometry and metal site density. After post-treatment under H2, narrowly dispersed and small nanoparticles are generated, for which the metal-support interface can even be controlled: e.g., metal siloxides grafted on alumina generate metal nanoparticles on surface aluminosilicate.4

Colloidal approach. Colloidal solutions can be prepared from organometallic precursors and then dispersed onto a support. This approach allows a better controlled of the particle size distribution and composition: e.g. 2-nm nickel−silicide nanoparticles from Ni(COD)2 and octylsilane can be prepared and dispersed on silica at low temperature, which generates highly active and stable catalyst for dry reforming.5

References

(1)       Furman, K.; Baudouin, D.; Margossian, T.; Sabnis, K. D.; Cui, Y.; Ribeiro, F. H.; Copéret, C. Journal of Catalysis 2015, 324, 9.

(2)       Baudouin, D.; Rodemerck, U.; Krumeich, F.; Mallmann, A. d.; Szeto, K. C.; Ménard, H.; Veyre, L.; Candy, J.-P.; Webb, P. B.; Thieuleux, C.; Copéret, C. Journal of Catalysis 2013, 297, 27.

(3)       Baudouin, D.; Margossian, T.; Rodemerck, U.; Webb, P. B.; Veyre, L.; Krumeich, F.; Candy, J.-P.; Thieuleux, C.; Copéret, C. ChemCatChem 2016, n/a.

(4)       Héroguel, F.; Siddiqi, G.; Detwiler, M. D.; Zemlyanov, D. Y.; Safonova, O. V.; Copéret, C. Journal of Catalysis 2015, 321, 81.

(5)       Baudouin, D.; Szeto, K. C.; Laurent, P.; De Mallmann, A.; Fenet, B.; Veyre, L.; Rodemerck, U.; Copéret, C.; Thieuleux, C. J. Am. Chem. Soc. 2012, 134, 20624.

 
 
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26.06.2017
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