(369e) Gold Nanorod@TiO2 Yolk-Shell Nanostructures for Visible-Light-Driven Photocatalytic Oxidation of Benzyl Alcohol
- Conference: AIChE Annual Meeting
- Year: 2015
- Proceeding: 2015 AIChE Annual Meeting Proceedings
- Group: Catalysis and Reaction Engineering Division
- Time: Tuesday, November 10, 2015 - 1:50pm-2:10pm
Selective oxidation of alcohols to corresponding carbonyl compounds such as aldehydes and ketones is an essential process for the synthesis of various chemicals as intermediates for pharmaceutical and fragrance industries. Recently, photocatalytic oxidation has been widely explored to meet the request of green chemistry. Among different semicondutor photocatalysts, titanium dioxide (TiO2) is a benchmark catalyst for its effectiveness, nontoxicity, low cost, and chemical stability. However, because of the large band gap, TiO2 shows high activity only in the UV region, which accounts for less than 5% of the total energy of the solar spectrum. Thus, efforts have been devoted to synthesize TiO2-based photocatalysts responsive to visible light, during which the Sensitizing by plasmonic metals has been proved to be a promising method. 
In this work, three kinds of gold nanorod@TiO2 yolk-shell (GNR@TiO2-YSs) catalysts with different aspect ratios (2.4, 4.2 and 5.4) are synthesized by an improved silica template method, which are denoted as GNR@TiO2-2.4-YSs, GNR@TiO2-4.2-YSs and GNR@TiO2-5.4-YSs, respectively. For comparison purpose, gold nanoparticles@TiO2 yolk-shell (GNP@TiO2-YS) catalysts and pure TiO2hollow spheres (HSs) were also synthesized by the similar method.
With a hollow TiO2 shell and a unique tunable cylindrical gold core, the GNR@TiO2-YS exhibits a high surface area and a wide absorption range from ultraviolet to near infrared region. The remarkable photochemical activity is obtained when such catalyst applied to the oxidation of benzyl alcohol. A mechanism is put forward and verified to describe the reaction process, which elucidates the advantages of such a structure when the catalysts are utilized to selectively photocatalytic oxidation.
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