Related Studies of Other Investigators

Recent work conducted in the laboratory of G. Ertl in Munich has extended the investigations on the ruthenium-copper system to include single crystal specimens (18-20). The results of the work are in excellent accord with those obtained in our laboratory on unsupported ruthenium-copper aggregates and on supported ruthenium-copper clusters as well. Our work on supported bimetallic clusters of ruthenium and copper is discussed in detail in the following chapter. 

The studies of Ertl and associates employed a surface consisting of the (0001) face of a ruthenium single crystal. Copper was deposited on the ruthenium surface by exposing the surface to a flux of copper atoms obtained by evaporation of a copper source. From low energy electron diffraction, Auger electron spectroscopy, thermal desorption, and work function measurements (18) Ertl and associates concluded that copper deposits on the ruthenium surface at 540 K in the form of a two-dimensional overlayer to coverages of 50 to 60%, beyond which there is a transition to a three-dimensional growth phase. 

Sinfelt, J.H. Barnett, A.E. and Carter, J.L., inventors Exxon Research and Engineering Company, assignee. Inhibition of hydrogenolysis. U.S. Patent 3,617,518. 4 pages. November 2, 1971. 

Sinfelt, J.H. Supported bimetallic cluster catalysts. / Catal. 29 308-315 1973. 

Hansen, M. Constitution of Binary Alloys. 2nd ed. New York McGraw-Hill 1958 p. 607, 620. 

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