Sulfide Catalysis without
Coordinatively Unsaturated
Sites: Hydrogenation, Cis–Trans Isomerization, and H<sub>2</sub>/D<sub>2</sub> Scrambling over MoS<sub>2</sub> and WS<sub>2</sub>
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Abstract
Simple test reactions as ethene hydrogenation, 2-butene
cis–trans
isomerization and H<sub>2</sub>/D<sub>2</sub> scrambling were shown
to be catalyzed by MoS<sub>2</sub> and WS<sub>2</sub> in surface states
which did not chemisorb oxygen and were, according to XPS analysis,
saturated by sulfide species. This is a clear experimental disproof
of classical concepts that require coordinative unsaturation for catalytic
reactions to occur on such surfaces. It supports new concepts developed
on model catalysts and by theoretical calculations so far, which have
been in need of confirmation from real catalysis
