Advances in Fischer-Tropsch chemistry

Caesar, P. D.; Brennan, J. Keirn; Garwood, W. E.; Ciric, Julius

doi:10.1016/0021-9517(79)90114-3

Cited by 118 publications

(25 citation statements)

References 6 publications

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“…Thus, it is seen that the reduction in the olefinicity of the C3 fraction is much higher compared to that in the C2 fraction. The observations of this investigation regarding the reduction of olefins, increase in the formation of isobutane in C4 fraction, and the formation of aromatics with sharp cuts in the aliphatics and aromatics are in accordance with the previously reported results (Caesar et al, 1979;Chang et al, 1979;Bruce et al, 1984). The decrease in C; and C, fractions as found in this work, is indicative of the cyclization and aromatization reactions over HZSM-5.…”

Section: Ail' Methylnaphthalenessupporting

confidence: 92%

“…Une comparaison des resultats pour le temps d'utilisation obtenus en employant le catalyseur I T seul ou melangt avec la zeolite HZSM-5 semble indiquer que les reactions kgissant la distribution globale des produits sont plus lentes sur HZSM-5 que sur le catalyscur I T . Thus, the synthesis gas can be directly converted to gasoline range product by combining FT synthesis function with a shape-selective acid function (Chang et al, 1979;Caesar et al, 1979;Haag and Huang, 1981;Bruce et al, 1984;Shamsi et al, 1984). On prCsente aussi I'analyse du coke sur les catalyscurs dtsactives.…”

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“…Most conventional Fischer-Tropsch ( l T ) catalysts produce a wide spectrum of hydrocarbon products (Anderson, 1956), however, if combined with a shape selective catalyst, a more selective hydrocarbon product can be produced. Thus, the synthesis gas can be directly converted to gasoline range product by combining FT synthesis function with a shape-selective acid function (Chang et al, 1979;Caesar et al, 1979;Haag and Huang, 1981;Bruce et al, 1984;Shamsi et al, 1984).…”

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confidence: 99%

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Direct conversion of synthesis gas to aromatic hydrocarbons: Variation of product distribution with time‐on‐stream

et al. 1986

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The synthesis of hydrocarbons from syngas was studied over a zirconia-based cobalt-nickel catalyst (FT catalyst) alone as well as mixed with zeolite HZSM-5 at 101.3 kPa in a 12.7 mm i.d. down flow reactor. The product distribution was recorded as a function of time-on-stream for several days of continuous operation under fixed operating conditions of 250°C and Hz/CO = I . For the FT t HZSM-5 system, a dramatic variation in the product distribution takes place during the first 24 h of operation. A comparison of time-on-stream results obtained using FT catalyst alone and mixed with HZSM-5 suggests that the reactions leading to the build-up of overall product distribution are slower over HZSM-5 compared to those taking place over R catalyst. These diffcrcnces have been attributed to the different nature of reactions taking place over the two components of the mixed catalyst system. Analyses of the coke on the deactivated catalysts are also reported.

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Section: Ail' Methylnaphthalenessupporting

confidence: 92%

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confidence: 99%

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Direct conversion of synthesis gas to aromatic hydrocarbons: Variation of product distribution with time‐on‐stream

et al. 1986

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“…An important class of synthesis gas conversion catalysts which produces high-octane gasoline with good yields was recently reported by Mobil workers (Chang et al, 1979;Caesar et al, 1979). These are bifunctional catalysts comprising a carbon monoxide hydrogenation catalyst and an excess volume of medium pore zeolite HZSM-5.…”

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Performance of combined cobalt—nickel—zirconia and HZSM‐5 catalyst systems for carbon monoxide hydrogenation

Varma¹,

Bakhshi²,

Mathews³

et al. 1985

Can J Chem Eng

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The synthesis of hydrocarbons via hydrogenation of carbon monoxide was investigated over cobalt-nickel-zirconia catalysts of various compositions in combination with zeolite HZSM-5 in "mixed bed" and "follow bed" arrangements. These combinations resulted in the formation of aromatics in amounts as high as 30-35 wt% under relatively mild operating conditions (1 atm, 250-280°C). Although the olefinicity of Cr and C, fractions in the product stream was higher in the mixed bed compared to the follow bed arrangement, the selectivities to aromatics were comparable in the two bed arrangements. The aromatic selectivity was found to be sensitive to operating conditions. The formation of aromatics was favored at high HZSM-S/metal catalyst ratios, low space velocities and high reaction temperatures. The product distributions obtained using various metal/zeolite bifunctional catalysts have been discussed.

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“…A number of researchers have considered composite catalysts for use in the Fischer-Tropsch (F-T) synthesis. Caeser et al (1979) have investigated an iron/ZSM-5 composite catalyst for enhancing the yield of olefinic and aromatic products over the iron catalyst in a fixed bed reactor. Their composite catalyst consisted of a mixture of fused iron particles and Z S M J (in excess volume).…”

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Physical effects on Fischer–tropsch synthesis over composite Ru catalysts

C(杨成)

Goodwin

1983

Can J Chem Eng

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Fischer–Tropsch synthesis was studied over composite catalysts formed by adding SiO2 to Ru/Al2O3 and to Ru/TiO2. The two Ru primary catalysts alone had reasonably similar catalytic properties for this synthesis. It was found that the presence of excess amounts of SiO2 with the primary Ru catalysts can produce significant changes in conversion and product selectivity, depending upon the support used. It is suggested that the effects produced by the physical presence of this inert material are due to a combination of primary catalyst activity, product selectivities, possible secondary reactions, heat and mass transfer effects, and reaction conditions. These results emphasize the importance of considering both physical and chemical effects when developing any composite catalyst mechanism.

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Advances in Fischer-Tropsch chemistry

Cited by 118 publications

References 6 publications

Direct conversion of synthesis gas to aromatic hydrocarbons: Variation of product distribution with time‐on‐stream

Direct conversion of synthesis gas to aromatic hydrocarbons: Variation of product distribution with time‐on‐stream

Performance of combined cobalt—nickel—zirconia and HZSM‐5 catalyst systems for carbon monoxide hydrogenation

Physical effects on Fischer–tropsch synthesis over composite Ru catalysts

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