Hydrogenation of Carbon Monoxide over Ruthenium-Rhenium on Alumina Catalysts

摘要

Ru/Al sub 2 O sub 3 , Re/Al sub 2 O sub 3 and Ru-Re/Al sub 2 O sub 3 catalysts were synthesized and characterized. A kinetics study was conducted for the methanation reaction on each of these catalysts using a Berty reactor. Operating conditions for kinetic experiments were 200 to 260 exp 0 C and 35 to 40 atm. Hydrocarbon products were detected by a gas chromatograph. It was found that the Ru/Al sub 2 O sub 3 and Re/Al sub 2 O sub 3 gave similar activation energies. The Ru-Re/Al sub 2 O sub 3 catalyst gave a significantly higher activation energy. Kinetic orders with respect to carbon monoxide and hydrogen were determined. Two mechanisms were proposed, one for the Ru/Al sub 2 O sub 3 and Re/Al sub 2 O sub 3 catalysts and one for the Ru-Re/Al sub 2 O sub 3 catalyst, from which the experimentally observed reaction orders could be derived. An Auger electron spectroscopy study was conducted on a 50:50 atom percent ruthenium-rhenium alloy to determine surface segregation. No surface segregation was observed even after heating the alloy for two weeks at 1050 exp 0 C. 22 figures, 9 tables. (ERA citation 08:011652)