A mesoporous silica bearing uniformly distributed copper oxide nanoparticles (CuO@mesoporous SiO₂) was prepared through silica nanocasting copper metal organic frameworks (MOFs) followed by calcination. The nanocasting filled the micropores of MOFs with silica and then, the calcination removed the organic linker in MOFs and converted copper metal ions into CuO particles, resulting in the CuO@mesoporous SiO₂ architecture. The characterization results indicated that the final product basically maintained the original MOF morphology and the mesoporous silica effectively prevented the aggregation of nanoparticles. In addition, the CuO@mesoporous SiO₂ exhibited a superior activity for catalyzing the oxidation of styrene, which could be attributed to the fact that the dispersed CuO particles in mesoporous silica provided more accessible catalytic sites and better stability. This work provides a new strategy to prepare nanoparticles@mesoporous silica with adjustable morphology structure, which has a promising potential in the field of heterogeneous catalysis.

中文翻译：

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通过煅烧用于苯乙烯氧化反应的纳米铸造金属有机骨架 (MOF) 制备 CuO@介孔 SiO2

通过二氧化硅纳米浇铸铜金属有机骨架（MOFs），然后进行煅烧，制备了一种载有均匀分布的氧化铜纳米颗粒的介孔二氧化硅（CuO@mesoporous SiO _{2 ）。}纳米铸造用二氧化硅填充 MOF 的微孔，然后煅烧去除 MOF 中的有机连接剂，并将铜金属离子转化为 CuO 颗粒，从而形成 CuO@介孔 SiO ₂结构。表征结果表明，最终产物基本保持了原有的MOF形貌，介孔二氧化硅有效地防止了纳米粒子的聚集。此外，CuO@介孔 SiO ₂表现出优异的催化苯乙烯氧化的活性，这可能是由于介孔二氧化硅中分散的CuO颗粒提供了更容易接近的催化位点和更好的稳定性。该工作为制备具有可调形貌结构的纳米粒子@介孔二氧化硅提供了新的策略，在多相催化领域具有广阔的应用前景。