4.7 Article

Impact of the surface hydrophobicity/hydrophilicity ratio on the catalytic properties of Ni nanoparticles/MCM-41 system used in the hydrogenation of acetophenone

Journal

CATALYSIS TODAY
Volume 372, Issue -, Pages 20-26

Publisher

ELSEVIER
DOI: 10.1016/j.cattod.2020.09.012

Keywords

hydrophobicity; hydrophilicity ratio; MCM-41 nanospheres; Nickel nanoparticles; Hydrogenation; Acetophenone

Funding

  1. FONCyT-ANPCyT [PICT 2017-2808]
  2. National University of La Plata
  3. CONICET

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The study examined the effect of surface hydrophobicity modulation on the performance of palladium nanoparticle catalysts through silylation treatment. The conversion rate of the catalyst was improved by the silylation treatment in chemoselective hydrogenation reactions, while the selectivity to the product was minimally affected.
Three nickel catalysts were prepared supporting pre-synthetized monodisperse Ni nanoparticles of 16 nm. As support, nanospheres of MCM-41 were used. Two batches of these supports were superficially modified by silylation treatments with different functionalizing agents: methyltrimethoxysilane and hexamethyldisilazane. These procedures led to three catalysts whose only structural differences were the surface hydrophobicity degrees. These catalysts were tested in chemoselective hydrogenation of acetophenone and the conversion level was increased by effect of the silylation. Instead, selectivity to 1-phenylethanol, the product of interest, stayed at very similar and high values, about 95 %. The sequence of activity levels was explained considering local effects (steric and energetic) of the different functionalizing groups.

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