Premium
Convenient and Mild Epoxidation of Alkenes Using Heterogeneous Cobalt Oxide Catalysts
Author(s) -
Banerjee Debasis,
Jagadeesh Rajenahally V.,
Junge Kathrin,
Pohl MargaMartina,
Radnik Jörg,
Brückner Angelika,
Beller Matthias
Publication year - 2014
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201310420
Subject(s) - catalysis , cobalt , oxide , graphene , cobalt oxide , chemistry , x ray photoelectron spectroscopy , carbon fibers , metal , nitrogen , inorganic chemistry , selectivity , materials science , organic chemistry , chemical engineering , nanotechnology , composite number , engineering , composite material
A general epoxidation of aromatic and aliphatic olefins has been developed under mild conditions using heterogeneous Co x O y –N/C ( x =1,3; y =1,4) catalysts and tert ‐butyl hydroperoxide as the terminal oxidant. Various stilbenes and aliphatic alkenes, including renewable olefins, and vitamin and cholesterol derivatives, were successfully transformed into the corresponding epoxides with high selectivity and often good yields. The cobalt oxide catalyst can be recycled up to five times without significant loss of activity or change in structure. Characterization of the catalyst by XRD, TEM, XPS, and EPR analysis revealed the formation of cobalt oxide nanoparticles with varying size (Co 3 O 4 with some CoO) and very few large particles with a metallic Co core and an oxidic shell. During the pyrolysis process the nitrogen ligand forms graphene‐type layers, in which selected carbon atoms are substituted by nitrogen.