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首页> 外文期刊>ACS applied materials & interfaces >Highly Efficient and Selective Oxidation of Aromatic Alcohols Photocatalyzed by Nanoporous Hierarchical Pt/Bi2WO6 in Organic Solvent-Free Environment
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Highly Efficient and Selective Oxidation of Aromatic Alcohols Photocatalyzed by Nanoporous Hierarchical Pt/Bi2WO6 in Organic Solvent-Free Environment

机译：无溶剂环境下纳米多孔Pt / Bi2WO6光催化高效选择性氧化芳香醇

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摘要

Selective conversion of aromatic alcohols into corresponding aldehydes is important from energy and environmental stance. Here, we describe highly selective (>99%) and efficient conversion (>99%) of aromatic alcohols (e.g., 4-methoxybenzyl alcohol and 4-nitrobenzyl alcohol) into their corresponding aldehydes in the presence of Pt-modified nanoporous hierarchical Bi2WO6 spheres in water under simulated sunlight at ambient conditions. Overoxidation of p-anisaldehyde, formed during photooxidation process, was not observed until comprehensive alcohol oxidation was attained. Furthermore, the catalyst showed substantial oxidation under dark and course of conversion was different than that of under light. Dependency of alcohol oxidation on substrate concentration, photocatalyst amount, and Pt loading was studied. The effect of various radical scavengers was investigated, and the rate-determining step was elucidated. It has been envisaged that the reduction site of semiconductor photocatalysts plays more decisive role in determining the selectivity as alcohol preferably get oxidized over that of water. Furthermore, the chemical stability and recyclability of the photocatalyst were investigated.
机译：从能量和环境的立场来看，芳族醇选择性转化为相应的醛很重要。在这里，我们描述了在Pt修饰的纳米多孔Bi2WO6球存在下，芳香族醇（例如4-甲氧基苄醇和4-硝基苄醇）的高选择性（> 99％）和有效转化（> 99％）转化为其相应的醛的方法。在环境条件下在模拟阳光下的水中。直到达到全面的醇氧化，才观察到在光氧化过程中形成的对茴香醛的过度氧化。此外，该催化剂在黑暗下显示出明显的氧化，并且转化过程与在光照下的转化过程不同。研究了醇氧化对底物浓度，光催化剂量和铂载量的依赖性。研究了各种自由基清除剂的作用，并阐明了决定速率的步骤。已经设想到，由于醇优选地比水的氧化程度高，因此半导体光催化剂的还原位点在确定选择性方面起着决定性的作用。此外，研究了光催化剂的化学稳定性和可回收性。

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