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Silica‐Encapsulated Pt‐Sn Intermetallic Nanoparticles: A Robust Catalytic Platform for Parahydrogen‐Induced Polarization of Gases and Liquids
Author(s) -
Zhao Evan W.,
MaligalGanesh Raghu,
Xiao Chaoxian,
Goh TianWei,
Qi Zhiyuan,
Pei Yuchen,
HagelinWeaver Helena E.,
Huang Wenyu,
Bowers Clifford R.
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201701314
Subject(s) - catalysis , selectivity , intermetallic , mesoporous silica , nanomaterials , nanoparticle , spin isomers of hydrogen , induced polarization , materials science , polarization (electrochemistry) , chemistry , dispersity , mesoporous material , chemical engineering , nanotechnology , hydrogen , organic chemistry , alloy , engineering , electrical engineering , electrical resistivity and conductivity
Recently, a facile method for the synthesis of size‐monodisperse Pt, Pt 3 Sn, and PtSn intermetallic nanoparticles (iNPs) that are confined within a thermally robust mesoporous silica (mSiO 2 ) 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@mSiO 2 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.