Synthesis, Organo-Functionalization, and Catalytic Properties of Tungsten Oxide Nanoparticles As Heterogeneous Catalyst for Oxidative Cleavage of Oleic Acid As a Model Fatty Acid into Diacids
2017
Enferadi-Kerenkan, Amir | Ello, Aimé Serge | Do, Trong-On
A series of tungsten oxide nanoparticles (NPs) has been synthesized via a green and straightforward approach exploiting bare tungsten powder as a precursor. The synthesized NPs were further organo-functionalized by cetyltrimethylammonium bromide (CTAB) in order to adjust their surface state and enhance their compatibility with biphasic oxidation of vegetable oils with H₂O₂. Simply, different structures of tungsten oxide were observed, which were characterized by XRD, FTIR, TGA, TEM, N₂ adsorption/desorption isotherms, and zeta potential analysis. All the synthesized nanocatalysts could fully convert oleic acid, and the highest yield of production of the desired diacid (azelaic acid), ∼80%, was achieved by optimization of the CTA⁺ amount on the nanocatalyst’s surface, which show excellent activity compared to the reported heterogeneous works. Thanks to the organo-functionalization, this water-tolerant catalyst exhibited no significant leaching, as well as convenient recovery and steady reuse without a noticeble decrease in activity, at least up to four cycles.
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