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Magnetically Separable Gold Catalyst for the Aerobic Oxidation of Amines
Author(s) -
Aschwanden Linda,
Panella Barbara,
Rossbach Peggy,
Keller Beat,
Baiker Alfons
Publication year - 2009
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.200900085
Subject(s) - catalysis , scanning electron microscope , superparamagnetism , selectivity , adsorption , transmission electron microscopy , scanning transmission electron microscopy , colloidal gold , mass spectrometry , materials science , magnetic separation , iron oxide , oxide , chemistry , nanoparticle , inorganic chemistry , nuclear chemistry , chemical engineering , nanotechnology , magnetization , organic chemistry , metallurgy , chromatography , physics , quantum mechanics , magnetic field , engineering , composite material
A magnetically separable, recyclable gold catalyst consisting of gold nanoparticles supported on intimately mixed superparamagnetic ceria/iron oxide has been prepared by simple addition of the preformed mixed oxide support and the gold precursor, Au(OAc) 3 , to the reaction mixture of the aerobic oxidation of amines. The catalyst was characterized by means of X‐ray diffraction (XRD), N 2 adsorption, superconducting quantum‐interference device (SQUID) measurements, time‐of‐flight secondary ion mass spectrometry (TOF‐SIMS), scanning transmission electron microscopy (STEM), and scanning electron microscopy with an energy‐dispersive X‐ray spectrometer (SEM‐EDAX). Catalytic tests with various amines showed high selectivity to the corresponding imines (87–100 %), and good separation efficiency and recyclability of the catalyst.