(9), c = 27.344 (6)/~, wR = 0.027 for 682 reflections] crystallize in related structures with a partly disordered arrangement of Al-atom triangles and rare-earth-metal atoms. Similar monoatomic layers to those in ErNi3AI9 build up the orthorhombic structure of Y2Co3AI9 (Y2Co3Ga9 type). The stoichiometry 1:3:9 is related to that of RzT3A19 by replacing every second mixed layer of composition R2AI3 by an Al-atom layer (A13): 6RT3A19 = 6R2T3AI9 -3RzAI3 + 3A13.
The electronic influence on the catalytic properties in the semihydrogenation of acetylene is addressed by applying unsupported intermetallic materials from the solid solution Ga 1−x Sn x Pd 2 (0 ≤ x ≤ 1). Due to the only marginal changes in the crystal structure, the whole series shows excellent selectivity to ethylene (∼85%) comparable with the binary GaPd 2 . Moreover, the incremental addition of up to one electron per formula unit reveals a maximum in the specific catalytic activity around the nominal composition with x = 0.28 corresponding to 4.0 atom % tin in the near-surface region, as revealed by operando X-ray photoelectron spectroscopy measurements. The study shows a reliable and quantitative relation between the d-band shift and catalytic activity, revealing once more the potential of intermetallic compounds in heterogeneous catalysis.
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