Influence of copper and potassium on the structure and carbidisation of supported iron catalysts for Fischer–Tropsch synthesis

Чернавский, П. А.; Казак, В.О.; Панкина, Г. В.; Perfiliev, Yu. D.; Li, Tong; Virginie, Mirella; Khodakov, Andreï Y.

doi:10.1039/c6cy02676a

Cited by 58 publications

(62 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[55] It is also used as an active site in the RWGS reaction, which inhibits methane production, in contrast with Co, Ni, and Ru. [55] It is also used as an active site in the RWGS reaction, which inhibits methane production, in contrast with Co, Ni, and Ru.…”

Section: Iron-basedcatalystsmentioning

confidence: 99%

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

2019

View full text Add to dashboard Cite

ReviewsScheme2.Redox (left) and associative (right) reaction pathways for the RWGS reaction. [82] Scheme3.Reduction and carburization steps of an iron-based catalyst. [83] Scheme4.Catalytic activity (top) and iron-phase composition of the catalyst (bottom) as af unction of time during the reaction. Reactionconditions:H 2 / CO 2 = 3, 250 8C, 1MPa, FeÀAlÀCuÀ9K catalyst. FT refers to the Fischer-Tropschr eaction. Arrows indicatethe increase or decrease of reaction yield/iron phase during ac ertain episode. [84] ChemSusChem

show abstract

Section: Iron-basedcatalystsmentioning

confidence: 99%

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

2019

View full text Add to dashboard Cite

show abstract

“…The most prominent effect was observed for coimpregnated catalyst (FeK)/CQ. Recently, we found that potassium inhibits the reduction of Fe 2 O 3 to Fe 3 O 4 by synthesis gas and significantly accelerates the formation of carbide . Cooling the catalysts after synthesis gas treatment with simultaneous measurement of magnetization demonstrated that Fe 5 C 2 is the only magnetic phase formed in such conditions (Figure ).…”

Section: Resultsmentioning

confidence: 95%

“…In as‐prepared catalysts, the interaction between an alkali metal and iron oxides strengthens Fe—O bonds thus decreasing iron reducibility . However, the formation of iron carbides is promoted by potassium …”

Section: Introductionmentioning

confidence: 99%

Carbon–Silica Composite as an Effective Support for Iron Fischer–Tropsch Synthesis Catalysts

et al. 2019

Self Cite

View full text Add to dashboard Cite

Carbon–silica composite is prepared by the impregnation of silica with aqueous glucose solution followed by drying and calcination in an inert atmosphere. This material is proposed as a support for the potassium‐promoted iron catalysts for Fischer–Tropsch synthesis (FTS). The catalysts are prepared by incipient wetness impregnation. The reducibility of CQ‐supported iron is increased and Hägg carbide is formed in the course of activation in CO/H2 flow at 400 °C for 2 h. Subsequent exposure in FTS conditions results in the significant increase of iron carbide particles, from 3–4 to 20–30 nm, while no such increase is detected for the pure silica as support. The carbon–silica composite support provides a beneficial effect on the catalytic activity of iron in CO hydrogenation as well as the suppression of methane formation and increasing Anderson–Schulz–Flory distribution (ASF) chain growth parameter. The catalysts are characterized by nitrogen adsorption, X‐ray absorption spectroscopy (XPS), transmission electron microscopy (TEM), and in situ magnetic measurements in the course of temperature‐programmed reduction by H2 and synthesis gas.

show abstract

“…Dual promoters usually function synergistically in literatures. Some of work employ a combination of cationic and anionic species, such as alkali metals and S promoter, and some focus on bimetallic promoters such as MnK, CuK, NaZn and so on . Some promoters, such as Mn, were reported with a combination effect on both particle size and local chemical environment, which contribute to catalytic performance in FTO .…”

Section: Introductionmentioning

confidence: 99%

Effect of Ca Promoter on the Structure and Catalytic Behavior of FeK/Al₂O₃ Catalyst in Fischer‐Tropsch Synthesis

et al. 2019

View full text Add to dashboard Cite

Fischer‐Tropsch synthesis (FTS) to olefins is an alternative route for lower olefins production. The role of alkaline‐earth metals as promoters in FTS was not so clear. Herein, we prepared a series of FeKCa/Al2O3 catalysts by excessive co‐impregnation method to elucidate the promotion effect of Ca on catalytic performance. Characterization technologies of N2 physisorption, XRD, Raman spectrum, TEM and CO chemisorption were used to study the textural properties, phase composition and dispersion of Fe species. The results showed that the addition of Ca promotes dispersion of iron species thus leads to much smaller crystallite size. Meanwhile, no electron donation effect was observed upon Ca introduction, as evidenced by XPS and H2‐TPR. A maximum of FTY is achieved at 1.0 wt.% Ca, followed by a decline when adding excessive Ca due to less exposed active sites. Notably, the product distribution is almost unchanged. The nearly constant TOF values with and without Ca addition indicates Ca works only as a structural promoter rather than chemical promoter.

show abstract

Influence of copper and potassium on the structure and carbidisation of supported iron catalysts for Fischer–Tropsch synthesis

Abstract: In silica supported iron Fischer–Tropsch catalysts, promotion with copper strongly enhances both hematite reduction and magnetite carbidisation, while potassium promotion hinders reduction of hematite to magnetite but enhances magnetite carbidisation in carbon monoxide.

Cited by 58 publications

References 43 publications

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

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

Carbon–Silica Composite as an Effective Support for Iron Fischer–Tropsch Synthesis Catalysts

Effect of Ca Promoter on the Structure and Catalytic Behavior of FeK/Al₂O₃ Catalyst in Fischer‐Tropsch Synthesis

Contact Info

Product

Resources

About

Influence of copper and potassium on the structure and carbidisation of supported iron catalysts for Fischer–Tropsch synthesis

Abstract: In silica supported iron Fischer–Tropsch catalysts, promotion with copper strongly enhances both hematite reduction and magnetite carbidisation, while potassium promotion hinders reduction of hematite to magnetite but enhances magnetite carbidisation in carbon monoxide.

Cited by 58 publications

References 43 publications

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

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

Carbon–Silica Composite as an Effective Support for Iron Fischer–Tropsch Synthesis Catalysts

Effect of Ca Promoter on the Structure and Catalytic Behavior of FeK/Al2O3 Catalyst in Fischer‐Tropsch Synthesis

Contact Info

Product

Resources

About

Effect of Ca Promoter on the Structure and Catalytic Behavior of FeK/Al₂O₃ Catalyst in Fischer‐Tropsch Synthesis