Bimetallic Fe–Co catalysts for the one step selective hydrogenation of CO₂to liquid hydrocarbons

Abstract

The direct conversion of CO2 to value-added products has received considerable attention as it can effectively mitigate CO2 emission and alleviate over-reliance on fossil fuels. We report the synthesis of...

Insights into Fischer–Tropsch catalysis: current perspectives, mechanisms, and emerging trends in energy research

“…Satthawong et al (2013) found that the combination of Fe with Co with a high Fe/Co ratio can enhance the activity and selectivity when using CO 2 and H 2 . Wang et al (2023b) proposed that Co enhances the activity by its H 2 dissociation ability, which can be altered by potassium to enhance the hydrogenation characteristics of CO formation and additionally enhances the formation of Fe phases that reduce CO 2 to CO.…”

Atomic-Scale Insights into Carbon Dioxide Hydrogenation over Bimetallic Iron–Cobalt Catalysts: A Density Functional Theory Study

“…There is a consensus in the literature that Fe-based nanoparticles that are utilized in CO or CO 2 hydrogenation transform to the active iron oxide and/or iron carbide phases under reaction conditions. Therefore, FeCo bimetallic nanoparticles that have higher Fe contents are generally represented by iron oxide or iron carbide facets [3], that are typically modelled by Fe-based phases doped by Co atoms in the literature [11]. On the other hand, cobalt catalysts are typically found in their metallic form, and cobalt nanoparticles that are smaller than 100 nm are reported to adopt the fcc crystal structure, exposing predominantly the most stable 111 facet [39].…”

“…Recently, Wang et al [11] found that Co doping could modify the performance of K-promoted Fe-based bimetallic catalysts, by increasing activity while also increasing the selectivity to CH 4 , C 2 -C 4 olefins, and C 5+ hydrocarbons. In order to obtain a mechanistic explanation of the observed behavior, the authors investigated CO 2 , CO, and H 2 adsorption energies on pure and Co-doped Fe and K-Fe oxide/carbide surfaces using DFT modeling for the proposed active phases of Fe-rich bimetallic FeCo catalysts.…”

“…Based on experimental data and DFT modeling, they concluded that FeCo alloy in the metallic phase could be the active phase for the high selectivity to the desired hydrocarbons, as it hinders methane formation (CH hydrogenation) and promotes CH coupling when promoted by Na species. In particular, they compared metallic Co (10)(11), CoO(100) and FeCo(110) alloy surfaces for CH hydrogenation and CH-CH coupling reactions. Their results showed that although the FeCo alloy surface favors CH hydrogenation over coupling compared to metallic Co, in the presence of Na, the FeCo surface promotes coupling over hydrogenation.…”

Rational Design of Pd-Based Alloys for 1,3-Butadiene Selective Hydrogenation via Equilibrium Models of Nanoparticles

“…Selective hydrogenation is one of the critical reactions to remove alkynes and dienes in monoolefine-rich steam. − The hydrocarbon streams from naphtha cracking typically contain 0.1∼1% alkynes or dienes, which must be reduced below 10 ppm before the subsequent reaction process because they poison the catalysts and degrade the product quality . For example, as for the alkylation reaction of the monoolefin in the C 4 fraction (1-butene and 2-butene-rich steam) to produce gasoline, a small amount of 1,3-butadiene in the C 4 fraction would lead to butadiene polymerization and form a heavy alkane polymer upon acid catalyst, which decreases the octane number of alkylated oil .…”