The key role of support surface tuning during the preparation of catalysts from reverse micellar-synthesized metal nanoparticles

Silica-supported cobalt catalysts have been prepared by depositing cobalt nanoparticles synthesized in reverse micellar systems. Two different reverse microemulsions comprising both a neutral (Triton X 114) or an ionic (AOT) surfactant were used for the synthesis of nanoparticles. The materials have been characterized by Si-29 MAS NMR, XRD, FTIR, H-2-TPR, and TEM. Protection of the hydroxyl groups on the silica surface by silylation prior to loading of the cobalt nanoparticles has been found crucial for attaining the desired metal dispersions in the final catalyst owing to a higher chemical compatibility between the hydrophobic support surface and the micro-emulsion during the deposition step. (C) 2007 Elsevier B.V. All rights reserved.