10.1002/anie.201710766
Angewandte Chemie International Edition
COMMUNICATION
After establishing this convenient access to highly dispersed
CoNx catalysts and having demonstrated their activity in FA
dehydrogenation, it was important to evaluate their recyclability
and stability. For any type of practical application, it is critical to
avoid the agglomeration during the reaction course. For this
reason, we reused the Co(1)/phen(7)/C catalyst in FA
dehydrogenation under optimal reaction conditions. To our
delight, the catalyst was still active after the fifth run, and
showed only slightly deactivation (Scheme S5). Notably, the
cobalt centers were quite stable during the reaction which was
proved by XRD, XPS and TEM (Figure S7-S10).
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In summary, we have developed a convenient synthesis of
materials with highly dispersed cobalt-nitrogen centers
supported on carbon. Compared to our previously described
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reactions further demonstrated the CoNx species as the active
site in the catalyst for this reaction. Further employments of this
highly dispersed CoNx/C catalyst in other reactions are ongoing
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Experimental Section
All characterization methods, reaction setup, procedures of the
catalyst preparation and catalytic dehydrogenation of FA can be
found in SI.
Acknowledgements
We thank Mrs Astrid Lehmann for the elemental analysis results
and Dr. Henrik Lund for XRD results.
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Keywords: cobalt • heterogeneous catalysis • formic acid •
dehydrogenation • energy
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