Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1484118 | Journal of Non-Crystalline Solids | 2005 | 15 Pages |
Abstract
Pd–Ag/SiO2 and Pd–Cu/SiO2 xerogel catalysts have been synthesized by cogelation of tetraethoxysilane (TEOS) and chelates of either Pd and Ag or Pd and Cu with 3-(2-aminoethylamino)propyltrimethoxysilane (EDAS). After an extensive study of the influences of synthesis operating variables over structural characteristics of gels, highly dispersed bimetallic Pd–Ag/SiO2 and Pd–Cu/SiO2 xerogel catalysts were obtained. These samples are then composed of completely accessible Pd–Ag and Pd–Cu alloy crystallites with sizes of 2–3.5 nm located inside silica particles exhibiting a monodisperse microporous distribution. It appears also that the metal complex acts as a nucleation agent in the formation of silica particles.
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Authors
Stéphanie D. Lambert, Cédric Gommes, Christelle Alié, Natalia Tcherkassova, Jean-Paul Pirard, Benoıˆt Heinrichs,