Silica-Encapsulated Pt-Sn Intermetallic Nanoparticles: A Robust Catalytic Platform for Parahydrogen-Induced Polarization of Gases and Liquids

Evan W Zhao; Raghu Maligal-Ganesh; Chaoxian Xiao; Tian-Wei Goh; Zhiyuan Qi; Yuchen Pei; Helena E Hagelin-Weaver; Wenyu Huang; Clifford R Bowers

doi:10.1002/anie.201701314

Silica-Encapsulated Pt-Sn Intermetallic Nanoparticles: A Robust Catalytic Platform for Parahydrogen-Induced Polarization of Gases and Liquids

Angew Chem Int Ed Engl. 2017 Mar 27;56(14):3925-3929. doi: 10.1002/anie.201701314. Epub 2017 Mar 9.

Authors

Evan W Zhao¹, Raghu Maligal-Ganesh², Chaoxian Xiao², Tian-Wei Goh², Zhiyuan Qi², Yuchen Pei², Helena E Hagelin-Weaver¹, Wenyu Huang², Clifford R Bowers¹

Affiliations

¹ Department of Chemistry and Department of Chemical Engineering, University of Florida, Gainesville, FL, 32611, USA.
² Department of Chemistry, Iowa State University, Ames Laboratory, U.S. Department of Energy, Ames, IA, 50011, USA.

PMID: 28276607
DOI: 10.1002/anie.201701314

Abstract

Recently, a facile method for the synthesis of size-monodisperse Pt, Pt₃ Sn, and PtSn intermetallic nanoparticles (iNPs) that are confined within a thermally robust mesoporous silica (mSiO₂ ) shell was introduced. These nanomaterials offer improved selectivity, activity, and stability for large-scale catalytic applications. Here we present the first study of parahydrogen-induced polarization NMR on these Pt-Sn catalysts. A 3000-fold increase in the pairwise selectivity, relative to the monometallic Pt, was observed using the PtSn@mSiO₂ catalyst. The results are explained by the elimination of the three-fold Pt sites on the Pt(111) surface. Furthermore, Pt-Sn iNPs are shown to be a robust catalytic platform for parahydrogen-induced polarization for in vivo magnetic resonance imaging.

Keywords: PtSn; hydrogenation; hyperpolarization; intermetallics; parahydrogen.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.