Enhanced C3+ alcohol synthesis from syngas using KCoMoSx catalysts: effect of the Co-Mo ratio on catalyst performance

CO hydrogenation over K‐Co‐MoSxcatalyst to mixed alcohols: A kinetic analysis

“…Our recent investigation also showed that cobalt‐molybdenum sulfide promoted by potassium is an effective catalyst system for HA synthesis 16 . Detailed study on the role of potassium and cobalt in K‐modified CoMoS x catalysts and their promotional effects on the selectivity of HAs have been reported by our group 17 . In this study, we aimed to analyze the kinetics of mixed alcohol synthesis over this catalyst system enabling an insight into the reaction and providing information applicable for reactor design and process optimization.…”

“…The influence of the H 2 /CO molar feed ratio on the selectivity of liquid oxygenates indicates that the selectivity decreases linearly with higher H 2 /CO molar feed ratios as shown in Figure 1D. At higher H 2 /CO molar ratio, the rate of chain growth by CO insertion decreases and higher hydrogen partial pressures supports the hydrogenation of intermediates to hydrocarbons 17 . As such, the selectivity of liquid oxygenates decreases at higher H 2 /CO molar ratio.…”

“…On the other hand, microkinetic models are complicated, but they are useful in case of design of new catalyst or improving the catalyst performance by providing insight into intermediates and preferred reaction pathways. However, in this study, our focus was on simplest approach providing information for reactor design and scale‐up as the insight into the role and function of catalyst active sites was studied in our previous report 17 …”

“…At higher H 2 /CO molar ratio, the rate of chain growth by CO insertion decreases and higher hydrogen partial pressures supports the hydrogenation of intermediates to hydrocarbons. 17 As such, the selectivity of liquid oxygenates decreases at higher H 2 /CO molar ratio.…”

“…16 Detailed study on the role of potassium and cobalt in K-modified CoMoS x catalysts and their promotional effects on the selectivity of HAs have been reported by our group. 17 In this study, we aimed to analyze the kinetics of mixed alcohol synthesis over this catalyst system enabling an insight into the reaction and providing information applicable for reactor design and process optimization. The effects of operating conditions such as temperature, pressure, gas hourly space velocity, and H 2 /CO molar feed ratio on HA selectivity have been investigated.…”