Preparation of Pt°/MCM-41: effect of drying on MCM-41 structure and Pt° dispersion

Baichun Zhu (1) , Franck Letellier (1) , Juliette Blanchard (1) , Katia Fajerwerg (1) , Catherine Louis (1) , Denis Guillaume (2) , Denis Uzio (2) , Miehèle Breysse (1)

1 LRS - Laboratoire de Réactivité de Surface
2 Institut Français du Pétrole

Pt°/MCM-41 catalysts were prepared by electrostatic adsorption of Pt(NH3)42+ at pH=8, followed by calcination under O2 and reduction. This procedure allows to prepare highly dispersed Pt° nanoparticles (D>76%), but has the drawback to modify significantly the structure of the ordered mesoporous support during the washing-drying step (decrease of the average pore diameter of ca. 10 Å and of the surface area of ca. 30 %). In order to circumvent this problem, various washing-drying procedures were investigated. Washing with ethanol followed by drying under vacuum at 30°C was shown to be the most appropriate procedure since it allows to preserve the structure of the support and the high dispersion of the metallic phase.

Domaines: Chimie de coordination

Baichun Zhu, Franck Letellier, Juliette Blanchard, Katia Fajerwerg, Catherine Louis, et al.. Preparation of Pt°/MCM-41: effect of drying on MCM-41 structure and Pt° dispersion. E.M. Gaigneaux; M. Devillers; D.E. De Vos; S. Hermans; P.A. Jacobs; J.A. Martens; P. Ruiz. Scientific Bases for the Preparation of Heterogeneous Catalysts, 162, Elsevier, pp.449-456, 2006, Studies in Surface Science and Catalysis, 978-0-444-52827-8. ⟨10.1016/S0167-2991(06)80939-0⟩. ⟨hal-03663614⟩