Deutero-1-pentene tracer studies for iron and cobalt Fischer–Tropsch synthesis

Gnanamani, Muthu Kumaran; Keogh, Robert A.; Shafer, Wilson D.; Davis, Burtron H.

doi:10.1016/j.apcata.2010.11.035

Cited by 13 publications

(10 citation statements)

References 33 publications

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“…Ratios of hydrocarbon products are particularly important in studies of the 1-olefin secondary reactions (e.g. hydrogenation to n-paraffin, isomerization to 2-olefin, readsorption and continued chain growth [10][11][12]). …”

Section: Introductionmentioning

confidence: 99%

Fischer–Tropsch synthesis product selectivity over an industrial iron-based catalyst: Effect of process conditions

et al. 2016

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Please cite this article in press as: B. Todic, et al., Fischer-Tropsch synthesis product selectivity over an industrial iron-based catalyst: Effect of process conditions, Catal. Today (2015), http://dx. a b s t r a c tThe effect of process conditions on product selectivity of Fischer-Tropsch synthesis (FTS) over industrial iron-based catalyst (100 Fe/5 Cu/4.2 K/25 SiO 2 ) was studied in a 1-L stirred tank slurry reactor. Experiments were performed over a range of different reaction conditions, including three temperatures (T = 493, 513 and 533 K), four pressures (P = 0.8, 1.5, 2.25 and 2.5 MPa), two synthesis gas feed molar ratios (H 2 /CO = 0.67 and 2) and gas space velocity from 0.52 to 23.5 Ndm 3 /g-Fe/h. The effect of process conditions on reaction pathways of FTS and secondary 1-olefin reactions was analyzed by comparing product selectivities, chain growth probabilities and ratios of main products (n-paraffin, 1-and 2-olefin). Reduction of methane production and increase of C 5+ products was achieved by decreasing temperature, inlet H 2 /CO ratio and/or increasing pressure. Overall selectivity toward methane and C 5+ did not show significant changes with variations in residence time. All of the product selectivity variations were shown to be related to changes in chain length dependent growth probabilities.

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Section: Introductionmentioning

confidence: 99%

Fischer–Tropsch synthesis product selectivity over an industrial iron-based catalyst: Effect of process conditions

et al. 2016

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“…3) suggests that, similar to the branched hydrocarbons, the internal alkenes should be the secondary products and formed through a pathway that differs from that results in 1-alkenes. The 1-octened 16 and 1-pentene-d 5 co-feed experiments during iron or cobalt catalyzed FT reactions [14,24] showed that the deutero-1-alkenes were reduced to deuterated alkanes, and isomerized to trans-2-alkenes and cis-2-alkenes with approximately equal amounts of the two isomers [14]. These results indicated that the 2-alkenes could be produced from corresponding 1-alkenes.…”

Section: Pathway For the Formation Of 2-alkenes During Ft Reactionsmentioning

confidence: 78%

Formation of 2-alkenes as secondary products during Fischer–Tropsch synthesis

Shi

Liao

Naumovitz

2015

Applied Catalysis A: General

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“…The calibration factors for the TCD detection of the D‐labeled C 1 to C 4 hydrocarbons were corrected using standard 99.999% deuterated compounds. The calibration factors for FID detection of the D‐labeled C 4 + hydrocarbons were assumed to be similar to the unlabeled hydrocarbons …”

Section: Methodsmentioning

confidence: 99%

Exchange interference for a range of partially deuterated hydrocarbons using a GC‐EI‐MSD

Shafer

Davis

2018

J Mass Spectrom

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Industrial catalyst processes, such as the Fischer-Tropsch process produce a vast array of products from syngas (H /CO) such as; jet fuel, gasoline, diesel, synthetic rubbers, monomers for plastics industries and other oil/wax materials for specific purposes such as cosmetics. Multitudes of publications, since the discovery of the FT process in 1925, have been composed attempting to elucidate the mechanism. Many of these publications attempt to investigation the mechanism of FT by the utilization of specific deuterium experimentation through the switching of the syngas from H /CO to D /CO. Results from this switching indicated that hydrogen was involved in the rate limited step, however; the overall process conversion produced an inverse kinetic isotope effect (IKIE). To confirm results were not hindered by the physical switch of the hydrogen isotopes, further experimentation was performed using equal molar of each isotope competitively (i.e. equal molar H /D )/CO. Complications arose from this competitive work as it generated fully exchanged products - all partially deuterated hydrocarbons that could not be separated by chromatography. Thus, these compounds could no longer be separated by the chromatography and now required a further separation by mass. The overall scope for this work was to determine if a range of partially deuterated paraffin compounds, generated by FT, can be analyzed using an EI-MSD without inter-instrumental H/D exchange. Results indicate that no real exchange occurs in the EI MSD for a carbon range from about C - C . Thus, even though the materials cannot be separated chromatographically they can be further separated and analyzed to determine the overall H/D content for these specific chain lengths.

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Deutero-1-pentene tracer studies for iron and cobalt Fischer–Tropsch synthesis

Cited by 13 publications

References 33 publications

Fischer–Tropsch synthesis product selectivity over an industrial iron-based catalyst: Effect of process conditions

Fischer–Tropsch synthesis product selectivity over an industrial iron-based catalyst: Effect of process conditions

Formation of 2-alkenes as secondary products during Fischer–Tropsch synthesis

Exchange interference for a range of partially deuterated hydrocarbons using a GC‐EI‐MSD

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