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Anaerobic Alcohol Conversion to Carbonyl Compounds Over Nanoscaled Rh-doped SrTiO3 Under Visible Light.

08:00 EDT 11th April 2019 | BioPortfolio

Summary of "Anaerobic Alcohol Conversion to Carbonyl Compounds Over Nanoscaled Rh-doped SrTiO3 Under Visible Light."

Photocatalytic oxidation of organic compounds on semiconductors provides a mild approach for organic synthesis and solar energy utilization. Herein, we identify the key points for the photocatalytic oxidation over Pt-loaded Rh-doped strontium titanate allowing converting alcohols efficiently and selectively to aldehydes and ketones under anaerobic conditions and visible light with an apparent quantum efficiency of pure benzyl alcohol oxidation at 420 nm up to 49.5%. Mechanistic investigations suggest that thermodynamically the controlled valence band edge position via Rh doping provides a suitable oxidation ability of photo-generated holes, avoiding the powerful hydroxyl radical intermediates prone to over-oxidation resulting in high selectivity. Kinetically, oxygen vacancies induced by Rh3+ substitution in the SrTiO3 lattice not only favor the dissociative adsorption of alcohols yielding alkoxy species, but also induce the weakening of the α-C-H bond facilitating its cleavage by the photo-generated holes. Pt nanoparticles deposited as cocatalyst contribute to the final hydrogen evolution.

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Name: The journal of physical chemistry letters
ISSN: 1948-7185
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