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Higher Alcohol Synthesis: Catalysis Reviews: Vol 33, No …

Synthesis of Higher Alcohols_1984 | Catalysis | …

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The Synthesis of Higher Alcohols Using Modified | …

The results revealed that Ni or Co modified K/β-Mo 2 C catalysts were shown to be highly active and selective towards the synthesis of mixed alcohols, especially for the C 2 + OH production, but Fe caused a negative effect.

Higher alcohol synthesis via syngas over CoMn catalysts derived from hydrotalcite-like precursors

Geometrical parameters of reactants and representative intermediates for methanol and higher alcohol synthesis over ZnCu(211) and Cs2O-ZnCu(211) and energy profiles of HCO and H2CO hydrogenation of HCO ()

Synthesis of higher alcohols from syngas overCU …

The promoting role of lanthanum oxide (La2O3) in the catalytic synthesis of mixed higher (C2–C6) alcohols from syngas on Co-based catalysts was investigated using a combination of in situ and ex situ X-ray diffraction (XRD), photoelectron spectroscopy (XPS), catalyst reactivity performance studies, and ab initio molecular dynamics (AIMD) simulations. XRD measurements show that doping with La (0.5 wt %) onto activated carbon (AC) supported Co catalyst enhances the Co2C phase formation, whereas the Co2C phase formation is largely suppressed on alumina supported Co catalyst. A strong correlation of the selectivity toward alcohols with the ratio of Co2C/Co particles present in the catalysts was observed. AIMD simulations suggest that on AC supports La exists as an oxide phase in the form of small clusters in the vicinity of Co particles. It was found that Co2C formation is energetically favorable, especially for smaller Co particles because of the formation of surface carbide. Theoretical mechanistic studies indicate that oxygenated hydrocarbons can be formed on these catalysts by multiple routes involving the formation of CHO and CHCO species at the interface between the La2O3 phase and Co/Co2C. A detailed comparison with previous findings in the literature as well as discussion of the implications of these results upon the improvement of the selectivity of these catalysts toward higher alcohols is presented.

Ethanol and higher alcohols have been identified as potential fuel additives or hydrogen carriers for use in fuel cells. One method of ethanol production is catalytic conversion of syngas (a mixture of CO, H2, CO2, and H2O), derived from biomass, coal, or natural gas. Thermodynamics of CO hydrogenation shows that ethanol is favored as the sole product at conditions of practical interest, but if methane is allowed as product in this analysis, essentially no ethanol is formed at equilibrium. The kinetics of ethanol formation must therefore be maximized. Although rhodium-based catalysts give C2+ oxygenates with high selectivity, their prohibitive cost has spurred research on less expensive copper-based alternatives. Copper-based catalysts require an optimum amount of promoter to suppress undesired reactions and maximize the yields of ethanol and higher alcohols. Common promoters include alkali, transition metals and their oxides, and rare earth oxides. Careful selection of operating variables is also necessary to achieve the desired activity and selectivity. This review describes the effects of promoters, supports, and operating conditions on the performance of copper-based catalysts for conversion of dry syngas to ethanol and higher alcohols. Proposed mechanisms from the literature for ethanol and higher-alcohol synthesis are outlined.

Catalytic synthesis of higher alcohols from Syngas

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