Tuning the Fischer–Tropsch reaction over CoxMnyLa/AC catalysts toward alcohols: Effects of La promotion

Cobalt catalysts on carbon-based materials for Fischer-Tropsch synthesis: a review

“…In the hydrogenation of carbon monoxide, the efficient control of the reaction selectivity to methane, olefins, oxygenated products, or long-chain paraffins is a major concern [275]. In FTS, a major challenge is the suppression of paraffinic byproducts and the promotion of alcohols and olefins [276]. For Co catalysts, the ability of cobalt to be selective with respect to alcohols and olefins strongly depends on properties such as metal dispersion or particle size, MSI and reducibility.…”

“…Using promoters also contributes to tune the MSI, thus increasing the number of active Co 0 surface sites, which enhances FTS rate and increases selectivity into FTS alcohols and olefins products. For example, Pt and Ru as promoters allow boosting FTS rate and SC5+ [140,159,186,199,277], Cu and CeO2-x are suitable for alcohol formation [275], while Mn and La are more beneficial for olefins formation [276,285]. >The high selectivity for alcohols, olefins and paraffins for promoted catalysts are attributed to the electronic properties of the promoters [140].…”

“…>The high selectivity for alcohols, olefins and paraffins for promoted catalysts are attributed to the electronic properties of the promoters [140]. Manganese facilitates the CO dissociative adsorption by the Lewis acid-base interaction between Mn 2+ and the oxygen atom of CO adsorbed, while La promoter assist both the hydrogenation and the CO insertion, thus, increasing the selectivity into paraffin and alcohol [276,286]. The reduction promoters such as Pt and Ru, affect the electronic structure of cobalt particles and increase the activity and selectivity into heavy paraffins [140].…”

Carbon-based catalysts for Fischer–Tropsch synthesis

“…The addition of 1 wt% La into 15Co-0.5Mn/AC improved the selectivity towards alcohols. 90 The hydrogenation of alkyl chains was favored in La promoted Co x Mn/AC due to the enhancement of H 2 chemisorption, resulting in a shift of the product selectivity toward short-chain length hydrocarbons. A relatively low loading of La provides a strong promotion effect on the alcohol synthesis.…”

Effect of the support on cobalt carbide catalysts for sustainable production of olefins from syngas

“…In addition to the formation of olefins, a large amount of oxygenates was also detected in the CNT-supported catalyst. Ding et al [38][39][40][41] reported that a high activity and high alcohol selectivity could be obtained on activated carbon-supported cobalt catalysts from syngas via FT reaction. They attributed this to the high dispersion of Co and the formation of Co2C species.…”