Abstract
Abstract The effect of lithium, potassium, cesium, and sulfur on CO hydrogenation over Rh/SiO 2 was studied in a differential reactor at 300°C and 10 atm. Small quantities of ethylene were added to the CO/H 2 reactant stream to delineate the various additive effect on CO insertion and hydrogenation steps during CO hydrogenation. H 2 S was found to strongly inhibit CO hydrogenation but had little effect on the CO insertion step. The most obvious effect of alkali additives was the suppression of hydrogenation. The suppression of hydrogenation on Rh/SiO 2 led to enhancement of C 2+ hydrocarbon selectivity in CO hydrogenation.
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