Catalytic polymerization of olefins

Éidus, Ya. T.; Ershov, N. I.; Puzitskii, K. V.; Kazanskii, B. A.

doi:10.1007/bf00910800

Cited by 1 publication

(2 citation statements)

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“…In addition, hydrogenation of C 2 H 4 is the dominant reaction under all reaction conditions. [21][22][23] Later, reabsorption and insertion of C 2 H 4 to form longer carbon chain products on Co-based catalysts were reported. 14,[25][26][27] Furthermore, a decrease in CH 4 selectivity was found when C 2 H 4 was co-fed, which was considered due to the competitive reaction between CO methanation and C 2 H 4 incorporation with the C 1 species.…”

Section: Introductionmentioning

confidence: 99%

“…The reactivity of C 2 H 4 under FTS conditions has been reported for both Fe-based and Co-based catalysts. [21][22][23] Schulz et al 24 found that the conversion of C 2 H 4 was less than 80% for iron-based catalysts, while almost all the C 2 H 4 was converted (conversions over 90%) when using cobalt-based catalysts. In addition, hydrogenation of C 2 H 4 is the dominant reaction under all reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

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Reaction of ethylene over a typical Fischer‐Tropsch synthesis Co/TiO₂ catalyst

Zhang

Tshwaku

Yao

et al. 2020

Engineering Reports

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In order to identify the potential reaction paths of C 2 H 4 and their product distribution in Fischer-Tropsch synthesis (FTS), a series of experiments were designed over a Co/TiO 2 catalyst in the absence of CO. C 2 H 4 did quickly react with H 2 to produce C 1-6 products under Fischer-Tropsch (FT) reaction conditions. Although the dominant reaction is C 2 H 4 hydrogenation to ethane, changing the reaction conditions (temperature and partial pressure of reactants) can lead to the other reaction pathways being enhanced, resulting in varying product selectivity to both linear and branch olefins and paraffins. Possible reaction pathways had been summarized and discussed, which including C 2 H 4 reaction to ethylidene followed by dimerization; C 2 H 4 insertion into C 2 surface species and dimerization and C 4 decomposition and/or direct C 2 hydrogenolysis. Furthermore, the products obtained from C 2 H 4 reactions were fit to a typical FTS product distribution, which indicate that both the chain growth initiators and monomers are not necessarily only derived from hydrogenation of CO but also from the secondary reactions of olefins. K E Y W O R D S cobalt catalysts, Fischer-Tropsch synthesis, product distribution, reactivity of C 2 H 4 1 INTRODUCTION Fischer-Tropsch synthesis (FTS) is an important technology used to convert syngas derived from coal/gas/biomass into clean transport fuels or other valuable organics. 1-8 FTS is generally regarded as a polymerization-like reaction. The products of FTS are a wide range of hydrocarbons, consisting of mainly olefins and paraffins, with a small amount of oxygenates. The Anderson-Schulz-Flory (ASF) equation is used to describe the FT product distribution; however, deviations from the ideal ASF distribution, such as a higher yield of C 1 , and a lower yield of C 2 , have been observed. 9,10 Many theories have been proposed to explain the deviation, and secondary reactions of olefins is considered as a reasonable explanation. 11-14 Therefore, it is interesting to investigate the reaction of C 2 H 4 under typical FTS operating conditions (similar space velocity, temperatures, and pressures). This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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