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Enhanced Chemoselectivity in Pt–Fe@mSiO2 Bimetallic Nanoparticles in the Absence of Surface Modifying Ligands

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Abstract

Noble metal-based bimetallic nanoparticles (NPs) synthesized using colloidal methods always contain organic capping agents. These NPs show high selectivities in many chemoselective hydrogenation reactions benefitting from both capping agents and secondary metals. However, it is challenging to separately identify the role of the secondary metal and the capping agents in the bimetallic NPs because the complete removal of the capping agents can often cause their aggregation or structural/compositional changes. Herein we report the synthesis of Pt5Fex (x = 1, 2 and 4) bimetallic NPs capped by an inorganic mesoporous silica (mSiO2) shell, which could prevent NP aggregation during high-temperature treatment to remove capping agents. Using these Pt5Fex@mSiO2 NPs with a clean surface, we could demonstrate the role played independently by the bimetallic composition in the selective hydrogenation of cinnamaldehyde and furfural. Understanding the functions of the secondary metal and the surface modifying ligands on the selectivity enhancement of bimetallic NPs is necessary for the design of high-performance chemoselective catalysts.

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Acknowledgements

Acknowledgment is made to the Donors of the American Chemical Society Petroleum Research Fund for partial support of this research. This work is also supported by the National Science Foundation (CHE-1607305). We thank G.J. Miller for the use of the XRD.

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Authors and Affiliations

  1. Department of Chemistry, Iowa State University, Ames, IA, 50011, USA

    Raghu V. Maligal-Ganesh, Kyle Brashler, Xuechen Luan, Tian Wei Goh, Jeffrey Gustafson, Jiashu Wu & Wenyu Huang

  2. Ames Laboratory, U.S. Department of Energy, Ames, IA, 50011, USA

    Raghu V. Maligal-Ganesh, Xuechen Luan, Tian Wei Goh & Wenyu Huang

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  1. Raghu V. Maligal-Ganesh
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  2. Kyle Brashler
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Correspondence to Wenyu Huang.

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Maligal-Ganesh, R.V., Brashler, K., Luan, X. et al. Enhanced Chemoselectivity in Pt–Fe@mSiO2 Bimetallic Nanoparticles in the Absence of Surface Modifying Ligands. Top Catal 61, 940–948 (2018). https://doi.org/10.1007/s11244-018-0933-2

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  • DOI: https://doi.org/10.1007/s11244-018-0933-2

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