Engineering of silica-supported platinum catalysts with hierarchical porosity combining latex synthesis, sonochemistry and sol-gel process – I. Material preparation
Andrés Felipe Sierra Salazar (University of Messina)
Tony Chave (Institut de Chimie Separative de Marcoule (ICSM))
André Ayral (Université de Montpellier)
Sergey I. Nikitenko (Institut de Chimie Separative de Marcoule (ICSM))
Vasile Hulea (ENSCM Ecole Nationale Superieure de Chimie de Montpellier)
Patricia J. Kooyman (TU Delft - Applied Sciences, University of Cape Town)
Frans D. Tichelaar (TU Delft - QN/Zandbergen Lab)
Siglinda Perathoner (University of Messina)
Patrick Lacroix-Desmazes (ENSCM Ecole Nationale Superieure de Chimie de Montpellier)
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Abstract
A novel catalyst preparation procedure is proposed in order to enhance the noble metal distribution at low loadings, while controlling the hierarchical porosity of the support material. Thus, a silica-supported platinum catalyst with hierarchical porosity was prepared using a combination of three processes performed in aqueous medium: emulsion polymerisation, sonochemistry and sol-gel synthesis. First, a polystyrene latex template of ca. 130 nm was synthesised by emulsion polymerisation and subsequently decorated with Pt nanoparticles of ca. 2.1 nm by sonochemical reduction of sodium tetrachloroplatinate. Then, the mesoporous silica support was prepared by a two-step acid-base catalysed sol-gel synthesis around the Pt-loaded latex spheres. Materials with specific surface areas and total pore volumes as high as 615 m2 g−1 and 0.74 cm3 g−1, respectively, were obtained.