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A Single Source Precursor Route to Group 13 Homo‐ and Heterometallic Oxides as Highly Active Supports for Gold‐Catalyzed Aerobic Epoxidation of trans ‐Stilbene
Author(s) -
Mishra Shashank,
Mendez Violaine,
Jeanneau Erwann,
Caps Valérie,
Daniele Stéphane
Publication year - 2013
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201201191
Subject(s) - chemistry , catalysis , x ray photoelectron spectroscopy , homoleptic , indium , oxide , metal , methylcyclohexane , nuclear chemistry , inorganic chemistry , crystallography , chemical engineering , organic chemistry , engineering
A new Mitsubishi‐type of star‐shaped homoleptic derivative of indium(III), In 4 (mdea) 6 ( 2 , mdeaH 2 = N ‐methyldiethanolamine), was synthesized by the chloro–aminoalkoxo exchange reaction of a heteroleptic complex In 6 Cl 6 (mdea) 6 ( 1 ) and used as a facile single source molecular precursor for the sol–gel preparation of high surface area indium oxide. Successful deposition of gold nanoparticles (1 wt.‐%) of average size 3.3 nm on the above metal oxide by using HAuCl 4 · 3H 2 O afforded a highly efficient Au/In 2 O 3 catalyst for the aerobic epoxidation of trans ‐stilbene at low temperature. The above single source precursor approach was further extended to obtain other group 13 homo‐ and heterometallic oxides, namely, α‐Ga 2 O 3 , β‐Ga 2 O 3 and Al 4 Ga 2 O 9 , as highly active supports for gold catalysts. The obtained Au/M 2 O 3 (M = Ga, In) and Au/Al 4 Ga 2 O 9 catalysts were thoroughly characterized by using several physicochemical techniques such as XRD, high resolution transmission electron microscopy (HR‐TEM), energy‐dispersive X‐ray (EDX) spectroscopy, and X‐ray photoelectron spectroscopy (XPS). A comparative study of the above catalysts for the model aerobic oxidation of stilbene in methylcyclohexane was undertaken.