Abstract
Different structures of cobalt and potassium modified molybdenum sulfide catalyst (KCoMoS2) were synthesized by hydrothermal synthesis, coprecipitation and reverse microemulsion methods. Nitrogen adsorption, XRD, TEM, XPS and HAADF-STEM-EDS techniques were used to characterize the catalysts structures. The results indicate that the molybdenum sulfide-based catalyst synthesized by the reverse microemulsion method possessed less sheets with small lateral dimensions, while the catalysts prepared by the former two methods contained a higher number of stacking MoS2 layers. In the test of higher alcohol synthesis from CO hydrogenation, it was found that the catalyst synthesized by the reverse microemulsion method exhibited the best CO conversion and C2+OH selectivity among the prepared catalysts. The correlation study between the catalysts structure and the reaction properties implies that the shorter and thinner molybdenum sulfide sheet structure favored for the exposure of the active sites, which, in turn, brought about an enhanced CO conversion and more C2+OH formation.
Highlights
With the shortage of petroleum resources, finding production routes for alternative fuels and the optimization of energy structure are of great significance for mitigating energy and environmental protection pressures as well as sustainable economic development [1,2]
The structures of hydrothermal synthesis method (HT)-KCoMo, CP-KCoMo, and ME-KCoMo catalysts were characterized by the BJH pore size distribution
KCoMoS2 catalysts of different structures were synthesized by hydrothermal synthesis, coprecipitation and reverse microemulsion methods
Summary
With the shortage of petroleum resources, finding production routes for alternative fuels and the optimization of energy structure are of great significance for mitigating energy and environmental protection pressures as well as sustainable economic development [1,2]. The catalytic production process for higher alcohols synthesis from syngas needs to occur over the solid catalysts, which are roughly classified into the following four categories: modified methanol synthesis catalysts [5,6], modified Fischer-Tropsch synthesis catalysts [7,8], noble metal ruthenium-based catalysts [9,10], and molybdenum sulfide-based catalysts [11,12]. Among these catalyst systems, the modified methanol synthesis catalyst mainly produced methanol with a lower C2+ OH selectivity.
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