Abstract Mesoporous NiO/Bi2WO6 nanocomposite has been synthesized and found to be an efficient catalyst for the oxidation of primary and secondary benzylic alcohols under mild conditions. The mean particle size of the nanocomposite, determined by SEM and TEM, is about 60 nm. The BET analysis shows a narrow pore-size distribution of 6–9 nm and specific surface area of 73 m2g-1, which is much higher than its individual components, i.e. Bi2WO6 and NiO nanoparticles. This mesoporous structure facilitates the access of bulky molecules to the active sites of the catalyst, increasing the catalytic activity. In this study, the effects of oxidant, reaction time, solvent, amount of catalyst, and catalyst reusability have been investigated. The results reveal that the synthesized nanocomposite shows a significant improvement in the oxidation of benzylic alcohols to their corresponding aldehydes under mild conditions with the selectivity over 99% and higher conversion percentage compared to its individual components. Additionally, the results of this study suggest that the conversions of substituted benzyl alcohols are dependent on the position of substituents on the ring. The catalyst can be recycled five times and reused for oxidation of alcohols without significant loss of activity.

中文翻译：

---

用于醇选择性氧化的介孔 NiO/Bi2WO6 纳米复合材料的合成

摘要 已经合成了介孔 NiO/Bi2WO6 纳米复合材料，并发现它是一种在温和条件下氧化伯醇和仲醇的有效催化剂。通过 SEM 和 TEM 测定的纳米复合材料的平均粒径约为 60 nm。BET 分析显示 6-9 nm 的窄孔径分布和 73 m2g-1 的比表面积，远高于其单个组分，即 Bi2WO6 和 NiO 纳米颗粒。这种介孔结构有利于大分子进入催化剂的活性位点，从而提高催化活性。在这项研究中，研究了氧化剂、反应时间、溶剂、催化剂用量和催化剂重复使用性的影响。结果表明，合成的纳米复合材料在温和条件下显着改善了苯甲醇氧化成相应醛的能力，与单个组分相比，选择性超过 99%，转化率更高。此外，这项研究的结果表明，取代苯甲醇的转化率取决于环上取代基的位置。该催化剂可循环使用五次，可重复用于醇的氧化而不会显着损失活性。这项研究的结果表明，取代苯甲醇的转化率取决于环上取代基的位置。该催化剂可循环使用五次，可重复用于醇的氧化，而不会显着损失活性。这项研究的结果表明，取代苯甲醇的转化率取决于环上取代基的位置。该催化剂可循环使用五次，可重复用于醇的氧化而不会显着损失活性。