Oxygenates from syngas over highly dispersed cobalt catalysts

Effects of impregnation strategy on structure and performance of bimetallic CoFe/AC catalysts for higher alcohols synthesis from syngas

“…The lower selectivity to alcohols for 15Co/SiO 2 catalyst is in accord with the results of studies using inorganic oxide supported monometallic cobalt catalyst with poor selectivity towards alcohols [30][31][32]. Whereas, it has been reported by Matsuzaki et al that SiO 2 supported cobalt catalyst is active for the alcohols formation [55][56][57]. They claimed that the alcohols formation was attributed to the highly dispersed metallic cobalt sites and corresponding bridged-CO species.…”

Cobalt supported on zirconia and sulfated zirconia II. Reactivity of adsorbed NOx compounds toward methane

“…At the same time, the band at 3667 cm −1 (due to the ν(OH)-stretching mode of adsorbed formic acid) appears in the spectrum with reduced intensity and a new band at 1896 cm −1 is detected. The latter absorption, according to the literature data [12,15], is assigned to ν(CO)-stretching vibration of linear or bridged carbonyls of cobalt in a zero oxidation state. Based on these facts, it is concluded that at 723 K the decomposition of formic acid to CO and H 2 O prevails.…”

“…The sharp band at 3019 cm −1 is due to the ν 3 mode of the gaseous methane. The weak absorption at 1848 cm −1 is characteristic of the ν(CO) mode of bridged carbonyl species adsorbed on metallic cobalt sites [12]. These experimental facts show that the oxidation of methane has occurred.…”

Effect of preparation conditions on the catalytic performance of Co/Ni catalysts for CO hydrogenation

“…Numerous studies have been devoted to ascertaining the influence of mixed carriers (e.g. titania, silica, alumina and zirconia) on the activity and stability of Co catalysts (Iglesia, 1997;Jalama et al, 2007;Wan et al, 2006;Matsuzaki et al, 1997;Kogelbauer et al, 1996;Hurlbut et al, 1996).…”