Ligand-free gold nanoclusters confined in mesoporous silica nanoparticles for styrene epoxidation,Nanoscale Advances

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Ligand-free gold nanoclusters confined in mesoporous silica nanoparticles for styrene epoxidation
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-03-18 , DOI: 10.1039/c9na00781d
Buthainah Al-Shankiti ₁ , Walid Al-Maksoud ₂ , Madathumpady Abubaker Habeeb Muhammed ₁ , Dalaver H Anjum ₃ , Basem Moosa ₁ , Jean-Marie Basset ₂ , Niveen M Khashab ₁

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We present a novel approach to produce gold nanoclusters (Au NCs) in the pores of mesoporous silica nanoparticles (MSNs) by sequential and controlled addition of metal ions and reducing agents. This impregnation technique was followed to confine Au NCs inside the pores of MSNs without adding external ligands or stabilizing agents. TEM images show a uniform distribution of monodisperse NCs with an average size of 1.37 ± 0.4 nm. Since the NCs are grown in situ in MSN pores, additional support and high temperature calcination are not required to use them as catalysts. The use of Au NC/MSNs as a catalyst for the epoxidation of styrene in the presence of tert-butyl hydroperoxide (TBHP) as a terminal oxidant resulted in an 88% conversion of styrene in 12 h with a 74% selectivity towards styrene epoxide. Our observations suggest that this remarkable catalytic performance is due to the small size of Au NCs and the strong interaction between gold and the MSNs. This catalytic conversion is environmentally friendly as it is solvent free. We believe our synthetic approach can be extended to other metal NCs offering a wide range of applications.

中文翻译：

限制在介孔二氧化硅纳米粒子中的无配体金纳米团簇用于苯乙烯环氧化

我们提出了一种通过顺序和受控地添加金属离子和还原剂来在介孔二氧化硅纳米粒子 (MSN) 的孔隙中产生金纳米簇 (Au NCs) 的新方法。遵循这种浸渍技术将 Au NCs 限制在 MSNs 的孔内，而不添加外部配体或稳定剂。TEM 图像显示平均尺寸为 1.37 ± 0.4 nm 的单分散 NC 分布均匀。由于 NC在 MSN 孔中原位生长，因此不需要额外的载体和高温煅烧即可将它们用作催化剂。Au NC/ MSNs在叔叔存在下作为苯乙烯环氧化催化剂的用途-丁基过氧化氢 (TBHP) 作为末端氧化剂导致苯乙烯在 12 小时内转化率为 88%，对苯乙烯环氧化物的选择性为 74%。我们的观察表明，这种显着的催化性能是由于 Au NCs 的小尺寸以及金和 MSNs 之间的强相互作用。这种催化转化是环保的，因为它不含溶剂。我们相信我们的合成方法可以扩展到提供广泛应用的其他金属 NC。

更新日期：2020-04-24

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