Fischer-Tropsch Synthesis: Differentive Reaction Rate Studies with Cobalt Catalyst

Anderson, R. B.; Krieg, Abraham.; Friedel, R. A.; Mason, L. S.

doi:10.1021/ie50478a032

Cited by 12 publications

(7 citation statements)

References 4 publications

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“…The results for each strategy, at two pressures of 1.0 and 9.0 atm, are presented in the following sections. Also, several research groups studied the performance of different cobalt catalysts under different H 2 /CO ratios (Anderson et al, 1949;Hurlbut et al, 1996;Kuipers et al, 1995;Madon and Iglesia, 1994;Patzlaff et al, 1999Patzlaff et al, , 2002Rohr et al, 2000;Schulz and Claeys, 1999;Yates and Satterfield, 1992). At a specified H 2 /CO ratio, the selectivity to light hydrocarbons (CH 4 and C 2 -C 4 ) is higher at lower pressure of 1.0 atm, while that of C 5+ is lower.…”

Section: Resultsmentioning

confidence: 99%

“…It is also shown (Anderson et al, 1949;Everson and Mulder, 1993;Everson et al, 1996) that most of the methane is formed in the entrance region of the FT catalyst bed. There are different ways of reducing the selectivity to methane, one of which is reducing the H 2 /CO ratio at the inlet to the reactor.…”

Section: Introductionmentioning

confidence: 94%

“…Among D, E and I strategies, the latter one corresponds to the lowest hydrogen partial pressure which causes the CO conversion to be minimum. Several studies (e.g., Anderson et al (1949), Everson and Mulder (1993) and Everson et al (1996)) have found that the methane and light olefins selectivity in FT synthesis in fixed bed reactors is higher at the beginning of the catalyst bed, where the selectivity of higher molecular weight hydrocarbons is lower and increases along the bed. This leads to lower overall methane and higher C 5 -C 10 selectivity at 1.0 atm as presented in Figures 4 and 6.…”

Section: Catalyst Activity and Selectivity In Hd Strategies (D E And I)mentioning

confidence: 99%

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Improving C11+ Hydrocarbon Product Selectivity by Hydrogen Distribution in Fischer-Tropsch Synthesis

Sharifnia¹,

Khodadadi²,

Mortazavi³

2008

International Journal of Chemical Reactor Engineering

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The present study examines the effect of hydrogen distribution (HD) along a Co/SiO 2 catalyst bed on Fischer-Tropsch (FT) synthesis. The synthesis is performed under two pressures of 1.0 and 9.0 atm and different H 2 /CO ratios. The results are compared to those of the usual co-feed, in which both CO and H 2 are introduced to the bed inlet. By HD strategy, the methane selectivity is suppressed by as much as 25% and the C 11+ selectivity is enhanced up to 26%. CO conversion and product selectivity exhibited a strong dependence on the operating pressure and H 2 /CO ratio, when hydrogen is distributed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

Section: Catalyst Activity and Selectivity In Hd Strategies (D E And I)mentioning

confidence: 99%

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Improving C11+ Hydrocarbon Product Selectivity by Hydrogen Distribution in Fischer-Tropsch Synthesis

Sharifnia¹,

Khodadadi²,

Mortazavi³

2008

International Journal of Chemical Reactor Engineering

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“…The increase in methane formation with increase in the partial pressure of hydrogen is in agreement with previous observations. Anderson 6 found that methane formation increased as the ratio of hydrogen to carbon monoxide was raised and that the reaction had an energy of activation different from that for the synthesis reaction. Basak 17 recorded similar results and also noted that the amount of methane formed depended on the extent of pre-reduction of the catalyst, a conclusion verified in the present work.…”

Section: A and M (A) (B)mentioning

confidence: 99%

“…With the conventional method of studying a complex catalytic reaction in a flow system, a great number of separate experiments are required to distinguish between primary and secondary products and to determine the kinetics of the reactions, because each experiment yields information only for the final mixture after passage through the reactor. An important improvement in technique was devised by Anderson et aI., 6 who took samples at different points along the catalyst bed. As a result, they were able to distinguish between primary and secondary reactions, and were able to decide which reactions were important at low conversions in the Fischer-Tropsch synthesis.…”

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confidence: 99%

Investigations of reactions along the catalyst bed in flow systems by vapour-phase chromatography. Part 1. The decomposition of methanol on a cobalt Fischer-Tropsch catalyst

Darby¹,

Kemball²

1957

Trans. Faraday Soc.

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It is shown that sampling along a catalyst bed combined with analysis by vapourphase chromatography is an informative technique for the investigation of catalytic reactions in a flow system. To illustrate the possibilities of the method, the decomposition of methanol, in the temperature range 163-210" C, is studied over a cobalt Fischer-Tropsch catalyst. The methanol decomposes to carbon monoxide and hydrogen, and the amounts of hydrocarbon and other synthesis products correspond to less than 1 % of the total reaction. The activation energy of the decompostion is 28.2 1.6 kcal/mole and the overall kinetics can be expressed by the equation dAdded hydrogen does not affect the rate of the decomposition, but the formation of methane is considerably enhanced by increase in the pressure of hydrogen. The significance of these results is discussed in relation to the nature of the initiating step in the Fischer-Tropsch synthesis.

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The fischer‐tropsch synthesis with cobalt catalysts: The effect of process conditions on the composition of the reaction products

Gibson¹,

Hall²

1954

J. Appl. Chem.

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The effects of the process variables on the alcohol and olefin contents of the liquid products and on the molecular weight of the total product obtained by synthesis with cobalt catalysts have been investigated.Within the range of reaction conditions hitherto employed, the generally accepted variations in product composition are confirmed, but, over the whole range of conditions within which cobalt catalysts are active for the synthesis, the effects of changes in conditions are more complicated and some new effects have been observed.The results suggest that the composition of the product is determined partly by the direct influence of the catalyst, the temperature, pressure, mean ratio of hydrogen to carbon monoxide, and space velocity of fresh gas, and partly by an indirect effect of these variables exerted through the extent of conversion of carbon monoxide and hydrogen. There is evidence that suggests that the olefin content varies inversely with the average molecular weight of the product.I t is considered that the results provide support for the hypothesis that the mechanism of the synthesis reaction involves step-wise growth of carbon chains, giving rise to alcohols, or alcohols and olefins, as the initial, desorbed products, the chemical identity of the molecules as they appear in the final product being determined by the extent to which secondary reactions occur. When cobalt catalysts are used a t atmospheric pressure it seems probable that, under certain conditions, some hydrogenation cracking takes place.

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Fischer-Tropsch Synthesis: Differentive Reaction Rate Studies with Cobalt Catalyst

Cited by 12 publications

References 4 publications

Improving C11+ Hydrocarbon Product Selectivity by Hydrogen Distribution in Fischer-Tropsch Synthesis

Improving C11+ Hydrocarbon Product Selectivity by Hydrogen Distribution in Fischer-Tropsch Synthesis

Investigations of reactions along the catalyst bed in flow systems by vapour-phase chromatography. Part 1. The decomposition of methanol on a cobalt Fischer-Tropsch catalyst

The fischer‐tropsch synthesis with cobalt catalysts: The effect of process conditions on the composition of the reaction products

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