Explaining the Size Dependence in Platinum‐Nanoparticle‐Catalyzed Hydrogenation Reactions. Issue 50 (11th November 2016)

• Record Type: Journal Article
• Authors: Bai, Licheng; Wang, Xin; Chen, Qiang; Ye, Yifan; Zheng, Haoquan; Guo, Jinghua; Yin, Yadong; Gao, Chuanbo
• Is Part Of: Angewandte Chemie international edition. Volume 55:Issue 50(2016)
• Page Start: 15656
• Page End: 15661
• Publication Date: 2016-11-11
• Subjects: d-band electron structure -- heterogeneous catalysis -- hydrogenation reactions -- platinum nanoparticles -- size effects; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201609663
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Hydrogenation reactions are industrially important reactions that typically require unfavorably high H2 pressure and temperature for many functional groups. Herein we reveal surprisingly strong size‐dependent activity of Pt nanoparticles (PtNPs) in catalyzing this reaction. Based on unambiguous spectral analyses, the size effect has been rationalized by the size‐dependent d‐band electron structure of the PtNPs. This understanding enables production of a catalyst with size of 1.2 nm, which shows a sixfold increase in turnover frequency and 28‐fold increase in mass activity in the regioselective hydrogenation of quinoline, compared with PtNPs of 5.3 nm, allowing the reaction to proceed under ambient conditions with unprecedentedly high reaction rates. The size effect and the synthesis strategy developed herein may provide a general methodology in the design of metal‐nanoparticle‐based catalysts for a broad range of organic syntheses. Abstract : Cat. size : The activity of Pt nanoparticles (PtNPs) in catalyzing the regioselective hydrogenation of quinoline (see picture) is strongly dependent on the size of the PtNPs. This dependence is rationalized by the size‐dependent d‐band electron structure of the PtNPs and thus their interactions with the reactants and the products.