Uniform catalytic active sites are crucial for both fundamental studies and practical applications. In this study, a Bi₂O₃-coated carbon nanotubes (CNTs) composite (Bi₂O₃-CNTs) was employed as a support to immobilize Pt catalysts using both atomic layer deposition (ALD) and impregnation methods. The geometric and electronic properties of the catalysts, along with their performance in the base-free oxidation of glycerol to dihydroxyacetone (DHA), were comparatively investigated. The results indicate that the ALD-prepared catalyst significantly outperforms the impregnation-prepared one in terms of catalytic activity and DHA yield. Characterization of the catalysts reveals that the superior performance of the ALD-prepared catalyst is attributed to the uniform Pt- Bi₂O₃ interface and the positively charged Pt species. Furthermore, tuning the geometric and electronic properties of ALD-prepared Pt catalysts leads to the development of a catalyst featuring a relatively abundant Pt-Bi₂O₃ interface and electron-deficient Pt, resulting in enhanced catalytic performance. These findings may offer valuable guidance for developing and optimizing Pt-based catalysts for the selective oxidation of glycerol to DHA.

中文翻译：

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构建均匀的 Pt-Bi2O3 界面，以增强甘油向二羟基丙酮的选择性氧化


均匀的催化活性位点对于基础研究和实际应用都至关重要。在这项研究中，采用 Bi₂O₃ 涂层碳纳米管 （CNT） 复合材料 （Bi₂O 3-CNTs） 作为载体，使用原子层沉积 （ALD） 和浸渍方法固定 Pt 催化剂。对催化剂的几何和电子性质，以及它们在甘油无碱氧化为二羟基丙酮 （DHA） 中的性能进行了比较研究。结果表明，ALD 制备的催化剂在催化活性和 DHA 产率方面明显优于浸渍制备的催化剂。催化剂的表征表明，ALD 制备的催化剂的优异性能归因于均匀的 Pt-Bi₂O₃ 界面和带正电荷的 Pt 物质。此外，调整 ALD 制备的 Pt 催化剂的几何和电子性质导致开发出具有相对丰富的 Pt-Bi₂O₃ 界面和缺电子 Pt 的催化剂，从而提高了催化性能。这些发现可能为开发和优化用于甘油选择性氧化为 DHA 的 Pt 基催化剂提供有价值的指导。