CoMn Catalysts Derived from Hydrotalcite-Like Precursors for Direct Conversion of Syngas to Fuel Range Hydrocarbons

Abstract

Two different groups of CoMn catalysts derived from hydrotalcite-like precursors were prepared through the co-precipitation method, and their performance in the direct production of gasoline and jet fuel range hydrocarbons through Fischer–Tropsch (FT) synthesis was evaluated in a batch autoclave reactor at 240 °C and 7 MPa and H2/CO of 2. The physicochemical properties of the prepared catalysts were investigated and characterized using different characterization techniques. Catalyst performance was significantly affected by the catalyst preparation method. The crystalline phase of the catalyst prepared using KOH contained Co3O4 and some Co2MnO4.5 spinels, with a lower reducibility and catalytic activity than cobalt oxide. The available cobalt active sites are responsible for the chain growth, and the accessible acid sites are responsible for the cracking and isomerization. The catalysts prepared using KOH + K2CO3 mixture as a precipitant agent exhibited a high selectivity of 51–61% for gasoline (C5–C10) and 30–50% for jet fuel (C8–C16) range hydrocarbons compared with catalysts precipitated by KOH. The CoMn-HTC-III catalyst with the highest number of available acid sites showed the highest selectivity to C5–C10 hydrocarbons, which demonstrates that a high Brønsted acidity leads to the high degree of cracking of FT products. The CO conversion did not significantly change, and it was around 35–39% for all catalysts. Owing to the poor activity in the water-gas shift reaction, CO2 formation was less than 2% in all the catalysts.

Life Cycle Assessment of Aviation Fuel Production from Steel-Industry Off-Gas

“…In 2009, the American Society for Testing Materials issued its inaugural approval for aviation kerosene produced using the FTJ method for use in commercial flights [10]. The Fischer-Tropsch (FT) process converts syngas, consisting of CO and H 2 , into alkane fuels [11]. Catalysts are pivotal in FT synthesis, commonly employing Fe, Co, Ni, and Ru [12].…”

Greener Catalysis for Environmental Applications

“…In such a sense, authors [7] have demonstrated the substitution of La with K cations in LaNiO 3 perovskite that exhibited a 100% selectivity towards the methanation of CO 2 at all temperatures investigated. On the other hand, reducing CO to value-added products such as gasoline and jet fuel range hydrocarbons by two different groups of CoMn catalysts derived from hydrotalcite-like precursors was reported by Gholami et al [8]. The catalysts prepared using a KOH + K 2 CO 3 mixture as a precipitant agent exhibited a high selectivity of 51-61% for gasoline (C 5 -C 10 ) and 30-50% for jet fuel (C 8 -C 16 ) range hydrocarbons compared with catalysts precipitated by KOH.…”