Structure of Co–K–Mo/γ-Al2O3 catalysts and their catalytic activity for mixed alcohols synthesis

Sol–gel Preparation of K–Co–Mo Catalyst and its Application in Mixed Alcohol Synthesis from CO Hydrogenation

“…Over the un-promoted K-MoS 2 sample, the activity and selectivity toward alcohol synthesis were rather low, and the predominant products were hydrocarbons. When the cobalt was incorporated, the space-time-yield (STY) of the total alcohol and the selectivity for C 2+ alcohol remarkably increased, indicating that the presence of cobalt in the catalysts was much effective for alcohol formation, consistent with the previous reports [10][11][12]. Comparing the three K-Co-Mo samples, the catalysts SKCM01 and SKCM02 that prepared by sol-gel method exhibited much higher STY of alcohol and selectivity for C 2+ alcohol than those of SKCM03.…”

“…Table 4 lists the catalytic performance of SKCM01 and those of some similar catalysts in previous reports [12,17,22]. Comparison with the unsupported K-Co-Mo catalysts in patents, the SKCM01 exhibited better activity for alcohol synthesis except that the C 1 OH/C 2+ OH ratio was a little high.…”

“…Jalowiechi et al [29] studied the treatment of sulfided Mo catalysts with H 2 and revealed that the supported MoS 2 /Al 2 O 3 catalysts can store much more amount of H 2 than the unsupported MoS 2 catalysts since the Mo species can be highly dispersed on the support. In light of the above, the Reaction conditions: T = 583 K, P = 5.0 MPa, GHSV = 4,800 h -1 , H 2 /CO = 2 [12] a Based on a CO 2 -free basis high alcohol activity of the sol-gel catalyst in this study should be attributed to its characteristics of large surface area and homogenous distribution of multi-components. Large specific surface area and small particle size contributed to create more Mo(CUS).…”

“…It was found that 3d transition metals, such as cobalt or nickel, are effective promoters of the Mo-based catalysts for enhancing the alcohol production, especially for improving the C 2+ alcohol selectivity [10][11][12]. Tatsumi et al [10] studied the catalytic performance and structure of reduced K-Ni-Mo/SiO 2 , and suggested that Ni-Mo alloy was the active species for alcohol formation.…”

“…Tatsumi et al [10] studied the catalytic performance and structure of reduced K-Ni-Mo/SiO 2 , and suggested that Ni-Mo alloy was the active species for alcohol formation. Bian et al [12] found that for sulfided K-Co-Mo/Al 2 O 3 catalysts, enhancing the interaction between Co and Mo atoms improved the activity and selectivity for mixed alcohol remarkably.…”