Nano Science and Technology Institute
Nanotech 2008 Vol. 1
Nanotech 2008 Vol. 1
Nanotechnology 2008: Materials, Fabrication, Particles, and Characterization - Technical Proceedings of the 2008 NSTI Nanotechnology Conference and Trade Show, Volume 1
Chapter 5: Nanoparticles & Applications

In-situ incorporation of Pd-MPTES complex in nanostructured silica

Authors:J. García Martínez, A.I. Carrillo, N. Linares
Affilation:University of Alicante, ES
Pages:729 - 732
Keywords:zeolite, mesostructured silica, catalysis, Pd, nanoparticles
Abstract:Recently, we described a simple method to incorporate metal nanopaticles in porous materials by functionalization of nanoparticles with trialkoxysilanes. This strategy is based on three steps: first, the metal nanoparticles were produced by controlled reduction in toluene and phase transfer to water, then they were functionallized with mercapto-terminal trialkoxysilanes and finally they were incorporated into the porous material by co-polymerization with a silica alkoxyde (tetraethoxysilane).[5] Herein, we describe a new technique which does not require the preparation of metal nanoparticles but the Pd precursor is directly introduced in the silica support. A Pd(II) complex with triethoxysilane ligands was synthesized by reaction between sodium tetrachloropalladate(II) and mercaptopropyltriethoxysilane (MPTES), previously used for the direct incorporation of Pd nanoparticle in mesoporous silica.[6] The Pd complex with trialkoxysilanes ligands (MPTES) was incorporated to various nanostructured silicas by copolymerization with tetraalkoxysilanes used as a silica precursor. This method allows for in situ incorporating the Pd-MPTES complex in MCM-41 type silica, zeolite A, zeolite Y and silicalite-1 during their synthesis. In a second step, Pd nanoparticles were produced through controlled reduction of the Pd complex by thermal treatment. These novel materials have highly dispersed strongly anchored Pd nanoparticles in their structures.
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