Abstract
The cover picture shows the hierarchical structure of the famous Li/MgO catalyst prepared for the oxidative dimerization of methane. It transpires that the Li/MgOx islands named as active sites are only transient species. Upon their complete volatilization, a modified structure of the parent MgO is generated, which exhibits high-energy surface terminations, such as steps and defect clusters. The porosity on several scales directs the material flow and may accommodate gas-phase reactions coupled to the surface activation of methane. The Minireview “Morphology and Microstructure of Li/MgO Catalysts for the Oxidative Coupling of Methane” on p. 949 ff., by Schlögl et al., reviews the structure-directory function of Li additives modifying the MgO bulk upon exposure to high temperatures and reactive atmospheres. The role of point defects and the redox activity of such modified MgO remain elusive.
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