Preparation of nanostructured Pd particles using a seeding synthesis approach—Application to the selective hydrogenation of buta-1,3-diene

G. Berhault (1) , L. Bisson , C. Thomazeau , D. Uzio , C. Verdon

1 IRCELYON - Institut de recherches sur la catalyse et l'environnement de Lyon

Well-defined nanostructured Pd particles were successfully synthesized in aqueous solution using a seeding-mediated approach with cetyltrimethylammonium bromide (CTAB) acting as both capping and structure-directing agent. Four well-defined nanoobjects were obtained: nanocubes, nanotetrahedra, nanopolyhedra, and nanorods. The anisotropic Pd nanorods exposed preferentially {1 0 0} facets due to the stabilization effect of CTAB. After deposition onto α-Al2O3, these nanostructured Pd particles were tested in the selective hydrogenation of buta-1,3-diene at 298 K under 20 bars of H2. Compared to an isotropic Pd catalyst, anisotropic Pd catalysts were found highly selective for the hydrogenation of buta-1,3-diene into butenes without further hydrogenation into butane. Moreover, on the nanostructured catalysts, further hydrogenation of but-1-ene into butane is reduced while but-2-enes were hardly converted. Finally, an unusual high level of cis but-2-ene isomer was observed. These results suggest a modification of the mechanism usually admitted for Pd catalysts when a well-defined nanomorphology is achieved.

Domaines: Environnement et Société; Catalyse

G. Berhault, L. Bisson, C. Thomazeau, D. Uzio, C. Verdon. Preparation of nanostructured Pd particles using a seeding synthesis approach—Application to the selective hydrogenation of buta-1,3-diene. Applied Catalysis A : General, 2007, 327, pp.32-43. ⟨10.1016/j.apcata.2007.04.028⟩. ⟨hal-00175429⟩