Photothermal Oxidation of Cinnamyl Alcohol with Hydrogen Peroxide Catalyzed by Gold Nanoparticle/Antimony‐Doped Tin Oxide Nanocrystals

Abstract

Gold nanoparticles with different mean sizes were formed on antimony‐doped tin oxide nanocrystals by the temperature‐varied deposition‐precipitation method (Au/ATO NCs). Au/ATO NCs possess strong absorption in the near‐infrared region due to Drude excitation in addition to the localized surface plasmon resonance (LSPR) of AuNPs around 530 nm. Au/ATO NCs show thermally activated catalytic activity for the oxidation of cinnamyl alcohol to cinnamaldehyde by hydrogen peroxide. The catalytic activity increases with a decrease in the mean Au particle size (dAu) at 5.3 nm≤dAu≤8.2 nm. Light irradiation (λex >660 nm, ∼0.5 sun) of Au/ATO NCs increases the rate of reaction by more than twice with ∼95 % selectivity. Kinetic analyses indicated that the striking enhancement of the reaction stems from the rise in the temperature near the catalyst surface of ∼30 K due to the photothermal effect of the ATO NCs.

Systematic Investigation on Supported Gold Catalysts Prepared by Fluorine-Free Basic Etching Ti3AlC2 in Selective Oxidation of Aromatic Alcohols to Aldehydes

“…Meanwhile, the adsorbed O 2 molecules were activated by electrons from the catalysts and formed oxidative species of•O 2 - [65]. Finally, the•O 2 captured H atoms from the aforementioned alcoholic intermediates to give benzaldehyde and H 2 O [66].…”