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High Catalytic Synergism between the Components of the Rhenium Complex@Silver Hybrid Material in Alkene Epoxidations
Author(s) -
Indra Arindam,
Greiner Mark,
Gericke Axel Knop,
Schlögl Robert,
Avnir David,
Driess Matthias
Publication year - 2014
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.201402042
Subject(s) - rhenium , catalysis , alkene , adsorption , metal , heterogeneous catalysis , materials science , composite number , inorganic chemistry , chemistry , chemical engineering , photochemistry , organic chemistry , metallurgy , composite material , engineering
The immobilization of a water‐soluble rhenium complex in metallic silver matrices has resulted in a highly efficient catalyst for epoxidation, which has better epoxidation catalytic activity than the individual components. This unprecedented synergism could be obtained only by using the novel immobilization methodology, and not by using the standard adsorption process. The composite catalyst has been fully characterized (by using XRD, TEM, SEM, energy‐dispersive X‐ray spectroscopy, and atomic X‐ray mapping), and the synergism has originated as a result of the proximity of the two components. Photoemission spectroscopic studies confirm the presence of +6 and +7 oxidation states of rhenium in metallic silver in the active catalyst.