Characterization of supported cobalt catalysts for CO hydrogenation.

摘要

Temperature-programmed reduction, X-ray photoelectron spectroscopy, and X-ray diffraction have been used as characterization techniques to investigate the effects caused by the support and metal precursor on the catalytic and reduction behaviors of dispersed cobalt CO hydrogenation catalysts. Silica, cerium oxide, and lanthanum oxide have been employed as supports. The nitrate, chloride, and acetate salts were used as the cobalt precursors. Both calcined and uncalcined catalysts have been studied. Under almost all of the conditions studied, the cobalt nitrate-derived catalysts had the highest activity for CO hydrogenation. The cobalt chloride-derived catalysts were generally poor catalysts with very low activity, unless the catalysts were calcined prior to the reduction process.;The support appears to be the dominant factor in reaction selectivity with the average chain length of the hydrocarbon products having the following order: Co/La