Effects of La₂O₃ on the Mixed Higher Alcohols Synthesis from Syngas over Co Catalysts: A Combined Theoretical and Experimental Study

Effects of impregnation strategy on structure and performance of bimetallic CoFe/AC catalysts for higher alcohols synthesis from syngas

“…However, the relatively lower alcohols selectivity of SiO 2 supported catalysts compared to the activated carbon supported catalysts mainly resulted from the absence of Co 2 C species. In combination with the previous phase analysis of the catalysts, it was deduced that the activated carbon promoted the formation of Co 2 C, while the silica suppressed the formation of Co 2 C. This deduction is in accordance with the result of Wang's work [46]. They found that the doping with La onto activated carbon supported Co catalyst promoted the Co 2 C phase formation, whereas it is largely suppressed on alumina supported Co catalyst.…”

“…These observations confirmed that the Co 2 C species were formed in the bimetallic catalysts during the CO hydrogenation, as shown by XRD results previously. Based on the previous investigations of our group [14,[25][26][27] and other researchers [46,47] as well as the result of this work, the formation of Co 2 C during the reaction seems to be pivotal for the synthesis of alcohols over the activated carbon supported bimetallic catalysts.…”

“…Based on the results of Table 2, it could be seen that the activated carbon support was more suitable for the alcohol synthesis compared to SiO 2 . According to Wang et al [46], the activated carbon facilitated the formation of Co 2 C species, while Al 2 O 3 restricted it. And Pei et al reported that the excess addition of SiO 2 to Co/AC catalyst inhibited the Co 2 C formation [26].…”

Characterization of Modified Fischer–Tropsch Catalysts Promoted with Alkaline Metals for Higher Alcohol Synthesis

“…Since hydrogenation of CO to hydrocarbon is thermodynamically more favorable than hydrogenation to alcohols, it is understandable that alcohol formation requires selective catalysts [11][12][13][14]. Therefore, a combination of the methanol synthesis catalysts (containing Cu) and the usual F-T catalysts containing transition metal oxides such as Co, Cr can theoretically work to produce high-molecularweight alcohols by CO hydrogenation [15].…”

Metal organic framework-mediated synthesis of potassium-promoted cobalt-based catalysts for higher oxygenates synthesis

“…Forming Co 2 C on the surface of a cobalt catalyst can provide both metallic cobalt and Co 2 C sites in close proximity, as is required for oxygenate formation. Although the role of Co 2 C in CO hydrogenation is not certain, there are several studies that detected the formation of cobalt carbide on catalysts with high oxygenate yields [20,[31][32][33][34].…”