EN
Today’s energy concerns require the development
of suitable solutions for the storage of energy from renewable
resources. Although the chemical storage of energy using
molecular hydrogen as energy carrier is one of the best
options, this type of energy storage requires the conversion
of hydrogen to liquid organic hydrogen careers (LOHCs)
for practical reasons. This goal is challenging and highly
desirable at the same time. In comparison to dihydrogen,
hydrogen storage in LOHCs offers easier handling and
minimum dangers involved in their production, storage,
and reconversion. To achieve efficient processes based on
LOHCs highly active catalyst systems are required which
ideally are based on cheap and abundant metals such
as iron. This review summarizes recent advances in ironcatalyzed
hydrogenation and dehydrogenation reactions,
with relevance to reversible hydrogen storage in small
molecules. It entails the dehydrogenation reactions of formic
acid and methanol water mixtures, the reverse reaction,
the hydrogenation of CO2, dehydrogenation of alcohols,
and the hydrogenation of different carbonyl compounds as
the formal reverse reaction, as well as hydrogenation and
dehydrogenation reactions of N-heterocyclic compounds
and hydrogen release reactions from amino boranes.