Construction of hollow mesoporous silica nanoreactors for enhanced photo-oxidations over Au-Pt catalysts

• 来源期刊: 国家科学评论（英文版）
• 年，卷（期）: 2020,（11）
• 所属期刊栏目: Special Topic:Hierarchically Porous Materials
• 页码范围: 1647-1655
• 页数: 9页
• 语种: 英文
• DOI: 10.1093/nsr/nwaa080

摘要

It is highly desirable to design hollow structures with multi-scale functions by mimicking cells for the construction ofmicro/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.