Abstract
AbstractPhotocatalytic oxidation of alcohols with high selectivity is a promising approach for the synthesis of organic compounds under mild conditions and for solar energy conversion. In this work, we report on the highly selective anaerobic photooxidation of alcohols to carbonyl compounds with coupled H2 production over Pt‐loaded Fe‐doped SrTiO3 under visible light. Representatively, an optimized apparent quantum efficiency of 13.2 % at 420 nm was obtained for benzyl alcohol oxidation. X‐ray absorption fine structure and in situ diffuse reflectance IR spectroscopy revealed that the surface oxygen vacancies and the fine‐tuned valence band edge position induced by Fe doping not only contributed to the activation of α‐C−H bonds in alcohols, but also avoided the over‐oxidation of the obtained carbonyl compounds.
Highlights
Photocatalytic oxidation of alcohols with high selectivity is a promising approach for the synthesis of organic compounds under mild conditions and for solar energy conversion
The alpha C H bonds in the alcohol molecules were activated by the oxygen defects on the photocatalyst surface and the limited oxidation potential of Fedoped SrTiO3 with fine-tuned valence band edge contributed to the very high selectivity
The highly crystalline Fe-doped SrTiO3 nanoparticles were synthesized by the polymerized complex method and exhibited a cubic phase of SrTiO3 when calcined higher than 500 °C.[10]
Summary
Selective Anaerobic Oxidation of Alcohols Over Fedoped SrTiO3 Under Visible Light. Yezi Hu,[a] Guixia Zhao,*[a, b] Qiushi Pan,[b] Huihui Wang,[a] Zewen Shen,[a] Baoxiang Peng,[b, c]. We applied Rh-doped SrTiO3 as photocatalyst in the anaerobic oxidation of alcohols under visible light, which was able to efficiently and selectively convert alcohols to carbonyl compounds. The apparent quantum efficiency (AQE) for the oxidation process of pure benzyl alcohol reached 49.5 % at nm.[7] It was found that the photocatalytic performance was highly dependent on the abundance of surface oxygen defects generated by doping with Rh. Due to the limited resources and the high price of Rh, more abundant elements such as Fe are considered promising to achieve selective photocatalytic oxidation of alcohols under visible light.[8] Fe-doped SrTiO3 (Fe-STO). The alpha C H bonds in the alcohol molecules were activated by the oxygen defects on the photocatalyst surface and the limited oxidation potential of Fedoped SrTiO3 with fine-tuned valence band edge contributed to the very high selectivity.
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