Tian Hao, Zhao Jinhui, Wang Xinyao, Wang Lizhuo, Liu Hao, Wang Guoxiu, Huang Jun, Liu Jian, Lu G Q Max
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics (DICP), Chinese Academy of Sciences, Dalian 116023, China.
Laboratory for Catalysis Engineering, School of Chemical and Biomolecular Engineering, Sydney Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia.
Natl Sci Rev. 2020 Apr 24;7(11):1647-1655. doi: 10.1093/nsr/nwaa080. eCollection 2020 Nov.
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 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.
通过模仿细胞来设计具有多尺度功能的中空结构以构建微/纳反应器是非常理想的。在此，我们报道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。优化了合成参数以研究通过水热处理中空结构的演变，并提出了一种“粘附-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，且吸附边缘出现红移，表明在合金界面处存在强烈的金属-金属相互作用。耦合的Au-Pt催化剂的反应性能可以调节，从而在肉桂醇氧化为肉桂酸的反应中实现优异的催化活性，产率为3.1 mmol g，选择性为99%。所提出的构建中空结构作为多功能微/纳反应器的策略，对于设计用于化学合成的高性能和可持续催化剂具有广阔前景。
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