Synthesis and Catalytic Properties of Heterobimetallic Clusters

无机化学项目的这笔拨款将继续支持杂双金属化合物的合成工作，杂双金属化合物由一个主基团杂原子（如硫）和从组（钼或钨）和（铁、钴或镍）中选择的一种或多种金属紧密结合在一起组成。将确定簇与感兴趣的催化分子（如CO、氢、炔、噻吩等）的化学反应，以及簇与表面金属氧化物载体的反应。研究发现，这些新的团簇负载在金属氧化物表面时，在催化CO加氢和加氢脱硫方面表现出有趣的选择性。建议确定存在于氧化物表面上的系综的性质，并阐明它们的催化作用模式。将被合成和研究的化合物在许多重要的化学过程中，如一氧化碳与氢的反应中，表现出选择性和高效的催化剂。其中一些化合物在加热后分解，形成高度活泼的小金属原子团簇，也可用作催化剂。

This grant in the Inorganic Chemistry Program will support continued work on the synthesis of heterobimetallic compounds which consist of a main group heteroatom, e.g., sulfur, and one or more metals selected from the sets, (molybdenum or tungsten) and (iron, cobalt, or nickel) tightly bonded together in a cluster. The chemical reactions of the clusters with molecules of interst in catalysis, e.g., CO, hydrogen, alkynes, thiophene, etc., will be determined, as will the reactions of the clusters with the surface metal oxide supports. It has been found that these new clusters show interesting selectivities in the catalysis of CO hydrogenation and hydrodesulfurization when supported on the surface of metal oxides. It is proposed to determine the nature of the ensembles present on the oxide surfaces and elucidate their mode of catalytic action. The compounds which will be synthesized and studied show promose as selective and efficient catalysts for a variety of important chemical processes, such as the reaction of carbon monoxide with hydrogen. Some of these compounds decompose upon heating to form highly reactive small clusters of metal atoms which may also be useful as catalysts.