Fe/γ-Al₂O₃and Fe–K/γ-Al₂O₃as reverse water-gas shift catalysts

Abstract

Fe–K/Al2O3 is shown to be an effective RWGS catalyst with high CO selectivity.

The Effect of Copper Addition on the Activity and Stability of Iron-Based CO2 Hydrogenation Catalysts

“…Table 2 provides preliminary results that support literature findings on the necessity of adding potassium to the catalyst matrix to achieve higher catalyst activity [24,32,33]. Without the addition of potassium to the catalyst matrix, CO 2 conversion drops to 17% and both the methane (35%) and carbon monoxide (11%) selectivities increase (Table 2).…”

“…Table 1 shows that a pure iron catalyst (100Fe/K) has similar activity to what has been previously published for studies performed at 300 °C and 290 psi [6,9,31,32,33]. The overall CO 2 conversion was 24%, 79% of which was converted into useful hydrocarbons.…”

“…To evaluate the potential benefits of adding copper to an iron-based CO 2 reduction catalyst, a standard iron CO 2 hydrogenation catalyst that has been covered extensively in the literature was used as the baseline catalyst matrix [6,9,31,33,34]. …”

A Critical Look at Direct Catalytic Hydrogenation of Carbon Dioxide to Olefins

“…Kinetic studies showed that, for aF e ÀK/Al 2 O 3 catalyst, ac ombination of redox and associativep athways occurs, with the redox mechanismd ominating. [82] Scheme 2s hows the elementary reactions for each proposed mechanism. In the redox pathway,C O 2 adsorbs and dissociates on the reduced active sites, which leads to the oxidation of actives ites.…”

“…[82] Scheme3.Reduction and carburization steps of an iron-based catalyst. [82] Scheme3.Reduction and carburization steps of an iron-based catalyst.…”