In this paper, we design a new interrupted AST‐type zeolitic imidazolate framework with cub and interrupted ast cages, which exhibits permanent porosity, high hydrophobicity and strong solid‐state photoluminescent properties. More details are discussed in the article by Wang & Zhang et al. on page 449–452.
The cover picture shows an arrangement of ruthenium atoms representing the active site of ruthenium catalysts for ammonia synthesis. This B(5)-type active site consists of three ruthenium atoms in one layer (blue spheres) and two ruthenium atoms in the layer directly above this (red spheres). This arrangement is energetically preferred, because none of the ruthenium atoms is in contact with both of the nitrogen atoms (green spheres) of the adsorbed N(2) molecule. Based on knowledge of this active site a number of catalysts were prepared by using [Ru(3)(CO)(12)] (upper green sphere) as a precursor. These catalysts were characterized (left red sphere and TEM micrograph in the background), tested using a parallel screening procedure (left and lower blue spheres), and kinetically analyzed (right blue sphere). The resulting barium-promoted Ru/MgO catalyst is the most active catalyst for ammonia synthesis to be described (right red sphere). It can be concluded that the B(5)-type site also dominates the activity of the promoted catalysts (lower green sphere). The enormous catalytic potential of Ba-Ru/MgO is described by Muhler et al. on pp. 1061 ff. 相似文献
