Untitled

Effect of K, Mn and Cr on the Fischer–Tropsch Activity of Fe:Co/TiO2 Catalysts

“…The increased reduction level is accompanied by an unexpected slight increase in dispersion level. The results obtained are consistent with that reported for Co/MnO [38] and Fe/MnO [39] systems, but difficult to correlate with studies where high Mn loadings were used with unsupported Fe:Co catalysts [40] In an effort to improve the performance of the system, the 0.1% Mn promoted Fe:Co/TiO 2 was reduced at two additional temperatures, i.e. 325 and 350°C.…”

“…Jensen and Massoth [26] noted that low level Mn promotion (<5%) of Co showed more pronounced selectivity effects than higher levels of Mn promotion. Gonzalez-Cortes et al [40] have reported on unsupported Mn promoted Fe:Co catalysts in the FT reaction (5:1 Fe:Co catalysts, >7% Mn) and showed that an increase in CH 4 and a slight decrease in olefin/paraffin ratio was generally observed.…”

Effect of preparation method on catalytic performance, structure and surface reaction rates of MgO supported Fe–Co–Mn catalyst for CO hydrogenation

“…The mixing of metal components has a great effect on the activity and selectivity because of the possible electronic interaction between metal species [13]. Fe-Mn and Co-Mn catalyst favor C 2 -C 4 olefins [14,15] than the other Fe or Co-based bimetallic catalysts. The CoMn catalysts are mainly composed of metallic cobalt particles dispersed in MnO [16], but Fe-Co catalyst favor intermetallic alloy formation [17,18].…”

Characterization of iron-cobalt oxide catalysts: Effect of different supports and promoters upon the structure and morphology of precursors and catalysts

“…It has been reported that a mixture of the two most active catalysts, Fe and Co, have generated product streams in the FT reaction richer in olefins than expected from either Fe or Co catalysts [15][16][17][18]. Fe/Co catalyst mixtures, typically supported, have been synthesized by numerous routes [15][16][17][18][19][20]. Supports that have been used include alumina [20], silica [21], carbon [22][23][24], zirconia [25] and titania [6,7,26,27].…”