title: Silica-Encapsulated Pt-Sn Intermetallic Nanoparticles: A Robust Catalytic Platform for Parahydrogen-Induced Polarization of Gases and Liquids.
abstract: Recently, a facile method for the synthesis of size-monodisperse Pt, Pt3Sn, 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@mSiO2catalyst. 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.
authors.affiliation: Department of Chemistry and Department of Chemical Engineering, University of Florida, Gainesville, FL, 32611, USA.
authors.forename: Evan W
authors.identifier: 0000-0003-2233-8603
authors.initials: EW
authors.lastname: Zhao
authors.affiliation: Department of Chemistry, Iowa State University, Ames Laboratory, U.S. Department of Energy, Ames, IA, 50011, USA.
authors.forename: Raghu
authors.initials: R
authors.lastname: Maligal-Ganesh
authors.affiliation: Department of Chemistry, Iowa State University, Ames Laboratory, U.S. Department of Energy, Ames, IA, 50011, USA.
authors.forename: Chaoxian
authors.initials: C
authors.lastname: Xiao
authors.affiliation: Department of Chemistry, Iowa State University, Ames Laboratory, U.S. Department of Energy, Ames, IA, 50011, USA.
authors.forename: Tian-Wei
authors.initials: TW
authors.lastname: Goh
authors.affiliation: Department of Chemistry, Iowa State University, Ames Laboratory, U.S. Department of Energy, Ames, IA, 50011, USA.
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Qi
authors.affiliation: Department of Chemistry, Iowa State University, Ames Laboratory, U.S. Department of Energy, Ames, IA, 50011, USA.
authors.forename: Yuchen
authors.initials: Y
authors.lastname: Pei
authors.affiliation: Department of Chemistry and Department of Chemical Engineering, University of Florida, Gainesville, FL, 32611, USA.
authors.forename: Helena E
authors.initials: HE
authors.lastname: Hagelin-Weaver
authors.affiliation: Department of Chemistry, Iowa State University, Ames Laboratory, U.S. Department of Energy, Ames, IA, 50011, USA.
authors.forename: Wenyu
authors.initials: W
authors.lastname: Huang
authors.affiliation: Department of Chemistry and Department of Chemical Engineering, University of Florida, Gainesville, FL, 32611, USA.
authors.forename: Clifford R
authors.identifier: 0000-0001-6155-5163
authors.initials: CR
authors.lastname: Bowers
keywords: PtSn; hydrogenation; hyperpolarization; intermetallics; parahydrogen