Authors: J. García Martínez, A.I. Carrillo, N. Linares
Affilation: University of Alicante, Spain
Pages: 729 - 732
Keywords: zeolite, mesostructured silica, catalysis, Pd, nanoparticles
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). 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. 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.