Catalytic Activity of Ag/SiO₂ and Ag/Co₃O₄ Hierarchically Porous Monoliths for Hydrogenation of Dyes

Title:Catalytic Activity of Ag/SiO₂ and Ag/Co₃O₄ Hierarchically Porous Monoliths for Hydrogenation of Dyes

Volume: 3 Issue: 3

Author(s): Yasemin Hakat, Trupti V. Kotbagi and Martin G. Bakker

Affiliation:

Keywords: Cobalt oxide, hydrogenation, monolith, nanocasting, silica, silver nanoparticles.

Abstract: In this work, the synthesis of silver (Ag) supported on hierarchically porous silica (SiO₂), and cobalt oxide (Co₃O₄) monoliths and the catalytic activity of these monoliths for the hydrogenation of methylene blue (MB) and methyl orange (MO) dyes in water is reported. The SiO₂ monoliths were synthesized using a sol-gel technique. The Co₃O₄ monoliths were prepared by nanocasting, using the SiO₂ monoliths as template. Loading of Ag nanoparticles on the SiO₂ and Co₃O₄ monoliths, was done by a solution infiltration method using aqueous silver nitrate (AgNO₃) solution followed by reduction with ethylene glycol. The resulting monoliths were characterized by XRD, BET-SA, and SEM, and the catalytic activity of the monoliths was studied for the hydrogenation of MB and MO by sodium borohydride (NaBH₄). Careful control experiments allowed the overall rate of the Ag catalyzed reaction to be corrected for the rates of the non-catalyzed reaction and the rates of dye adsorption on the supports and Ag nanoparticles. Ag supported on SiO₂ gave the fastest hydrogenation for MB, Ag on Co₃O₄ gave the fastest MO hydrogenation.

Cite this article as:

Hakat Yasemin, Kotbagi V. Trupti and Bakker G. Martin, Catalytic Activity of Ag/SiO₂ and Ag/Co₃O₄ Hierarchically Porous Monoliths for Hydrogenation of Dyes, Current Catalysis 2014; 3 (3) . https://dx.doi.org/10.2174/2211544703666140820225515