Temperature oscillation in a catalytic particle of Fischer–Tropsch synthesis

Деревич, И. В.

doi:10.1016/j.ijheatmasstransfer.2009.09.045

Cited by 7 publications

(3 citation statements)

References 22 publications

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“…In this mechanism, a thermokinetic feedback caused by the high exothermicity of the FT reaction produced an increase of the temperature and an acceleration in the consumption of the adsorbed reactants, which then slowed the reaction and closed the cycle. In this way, the thermokinetic instability may trigger self-sustained oscillations (37), as observed in our research and described above.…”

Section: Experimental Studiessupporting

confidence: 66%

The oscillating Fischer-Tropsch reaction

Zhang,

Wang,

Gaspard

et al. 2023

Science

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The mechanistic steps that underlie the formation of higher hydrocarbons in catalytic carbon monoxide (CO) hydrogenation at atmospheric pressure over cobalt-based catalysts (Fischer-Tropsch synthesis) have remained poorly understood. We reveal nonisothermal rate-and-selectivity oscillations that are self-sustained over extended periods of time (>24 hours) for a cobalt/cerium oxide catalyst with an atomic ratio of cobalt to cerium of 2:1 (Co 2 Ce 1 ) at 220°C and equal partial pressures of the reactants. A microkinetic mechanism was used to generate rate-and-selectivity oscillations through forced temperature oscillations. Experimental and theoretical oscillations were in good agreement over an extended range of reactant pressure ratios. Additionally, phase portraits for hydrocarbon production were constructed that support the thermokinetic origin of our rate-and-selectivity oscillations.

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Section: Experimental Studiessupporting

confidence: 66%

The oscillating Fischer-Tropsch reaction

Zhang,

Wang,

Gaspard

et al. 2023

Science

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“…In this case there is always a non-zero probability for a temperature fluctuation, the magnitude of which exceeds a critical value, which may lead to the loss of thermal stability. Study of the effect of random noise is dedicated to the behavior of systems with explosive features, for example, [7][8][9][10][11]. The results of this study can also be applicable in modeling of ignition conditions of dispersed fuel in aircraft and rocket engines, and power stations.…”

Section: Introductionmentioning

confidence: 99%

“…Investigation on effect of noise is devoted to the behavior of systems with explosive behavior [7][8][9][10][11]. Study of random temperature fluctuations was carried out in the framework of probability density function approach [12].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Thermal Explosion of Catalytic Granule in Fluctuating Temperature Field

Деревич¹,

Galdina²

2013

JAMP

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Method for numerical simulation of the temperature of granule with internal heat release in a medium with random temperature fluctuations is proposed. The method utilized the solution of a system of ordinary stochastic differential equations describing temperature fluctuations of the surrounding and granule. Autocorrelation function of temperature fluctuations has a finite decay time. The suggested method is verified by the comparison with exact analytical results. Random temperature behavior of granule with internal heat release qualitatively differs from the results obtained in the deterministic approach. Mean first passage time of granules temperature intersecting critical temperature is estimated at different regime parameters.

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