Stanley G. Brandenberger

Hydrogen chemisorption and surface composition of silica-supported platinum-copper alloys

Abstract Silica-supported platinum-copper alloys were prepared as single-phase solid solutions. The surface composition of the alloy crystallites depends upon crystallite size: the larger the crystallite, the more the surface is enriched with copper. The surface composition of small crystallites (diameter

Mechanism of olefin disproportionation

Disproportionation of olefins has been investigated under selective conditions. The primary products from the reaction of 1-pentene are ethylene and n-octenes, and 2-pentene yields 2-butene and n-hexenes. From the mixed olefins, 1-pentene and 2-pentene, propylene, n-heptenes, 1-butene, and n-hexenes are primary products. A mixture of 1-pentene and 1-hexene gives ethylene and n-nonenes as initial products. From these results and consideration of molecular orbital symmetry conservation, it is proposed that the reaction proceeds via adsorbed cyclobutane.