Promotion of cobalt catalysts for the Fischer-Tropsch synthesis with alkali metals

Елисеев, О. Л.; Tsapkina, M. V.; Dement’eva, O. S.; Davydov, P. E.; Kazakov, A. V.; Лапидус, А. Л.

doi:10.1134/s0023158413020055

Cited by 21 publications

(7 citation statements)

References 13 publications

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“…The product distribution that is displayed in the oil and wax products for cobalt seems to be more dependent upon the support, and less so on promoter type (Pt, Ru, Ag) and loading; the promoter does affect the distribution, but it mainly affects methane and the other hydrocarbon selectivities [101,102]. The addition of potassium to cobalt FT catalysts resulted in a promotion of chain growth [103], but the effect reached a maximum. The paraffin still dominates for the entire range of products ( Figures 14, 17 and 32), with only slight fluctuations in the alcohol and olefin contents.…”

Section: Cobaltmentioning

confidence: 94%

Fischer–Tropsch: Product Selectivity–The Fingerprint of Synthetic Fuels

et al. 2019

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The bulk of the products that were synthesized from Fischer–Tropsch synthesis (FTS) is a wide range (C1–C70+) of hydrocarbons, primarily straight-chained paraffins. Additional hydrocarbon products, which can also be a majority, are linear olefins, specifically: 1-olefin, trans-2-olefin, and cis-2-olefin. Minor hydrocarbon products can include isomerized hydrocarbons, predominantly methyl-branched paraffin, cyclic hydrocarbons mainly derived from high-temperature FTS and internal olefins. Combined, these products provide 80–95% of the total products (excluding CO2) generated from syngas. A vast number of different oxygenated species, such as aldehydes, ketones, acids, and alcohols, are also embedded in this product range. These materials can be used to probe the FTS mechanism or to produce alternative chemicals. The purpose of this article is to compare the product selectivity over several FTS catalysts. Discussions center on typical product selectivity of commonly used catalysts, as well as some uncommon formulations that display selectivity anomalies. Reaction tests were conducted while using an isothermal continuously stirred tank reactor. Carbon mole percentages of CO that are converted to specific materials for Co, Fe, and Ru catalysts vary, but they depend on support type (especially with cobalt and ruthenium) and promoters (especially with iron). All three active metals produced linear alcohols as the major oxygenated product. In addition, only iron produced significant selectivities to acids, aldehydes, and ketones. Iron catalysts consistently produced the most isomerized products of the catalysts that were tested. Not only does product selectivity provide a fingerprint of the catalyst formulation, but it also points to a viable proposed mechanistic route.

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Section: Cobaltmentioning

confidence: 94%

Fischer–Tropsch: Product Selectivity–The Fingerprint of Synthetic Fuels

et al. 2019

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“…8 It has also previously been shown that adding alkali metals with cobalt increases selectivity to heavier HCs (for traditional FT reaction). 9 Furthermore, in traditional FT catalysis the olefin-paraffin ratio increases with addition of alkali metals. 10 Thus, we tested a range of Co:Pd:K systems Table 1 entries 2-9 with palladium present to aid CO production and potassium to increase selectivity to heavier HCs.…”

mentioning

confidence: 99%

Cobalt catalysts for the conversion of CO2 to light hydrocarbons at atmospheric pressure

et al. 2013

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“…It is well known that alkaline promoters in small con centrations have an effect on the catalytic properties of cobalt catalysts; in particular, they increase selectivity for higher hydrocarbons [6]. Previously, Eliseev et al [7] also noted this effect. Thus, the higher selectivity of sample 2 can be attributed to the higher sodium con tent of the support from SASOL.…”

Section: Effects Of Mgo and Tio 2 On The Properties Of Cobaltmentioning

confidence: 90%