Abstract

It is highly desirable to design hollow structures with multi-scale functions by mimicking cells for the construction of micro/nanoreactors. Herein, we report the construction of hollow-structured submicrometer-photoreactors with bimetallic catalysts loaded within mesoporous silicas. The synthesis parameters are optimized to study the evolution of hollow structure through hydrothermal treatment and an ‘adhesive-contraction’ formation mechanism is proposed. AuPt@HMZS catalysts exhibited a broader absorbance region under visible light and the adsorption edge displayed a red-shift, indicating the strong metal–metal interactions at the alloy interface. The reaction performance of the coupled Au-Pt catalysts can be tuned to achieve excellent catalytic activity in cinnamyl alcohol oxidation to cinnamic acid for 3.1 mmol g⁻¹ with 99% selectivity. The proposed strategy to build hollow structures as multifunctional micro/nanoreactors is promising for the design of high-performance and sustainable catalysts for chemical synthesis.

中文翻译：

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构建中空介孔二氧化硅纳米反应器以增强 Au-Pt 催化剂的光氧化

摘要

通过模拟细胞构建微/纳米反应器来设计具有多尺度功能的中空结构是非常可取的。在此，我们报告了在介孔二氧化硅中负载双金属催化剂的中空结构亚微米光反应器的构建。优化合成参数以研究通过水热处理的空心结构的演变，并提出了“粘合剂-收缩”形成机制。AuPt@HMZS催化剂在可见光下表现出更宽的吸收区域，吸附边缘呈现红移，表明合金界面处金属-金属相互作用强。可以调整偶联的 Au-Pt 催化剂的反应性能，以在 3.1 mmol g ^{-1 的}肉桂醇氧化成肉桂酸中实现优异的催化活性具有 99% 的选择性。提出的将空心结构构建为多功能微/纳米反应器的策略有望用于设计高性能和可持续的化学合成催化剂。