Chemistry and kinetics of chemical vapor deposition of pyrolytic carbon from ethanol

Li, A.; Zhang, S.; Резник, Б.; Lichtenberg, Sven; Schoch, G.; Deutschmann, Olaf

doi:10.1016/j.proci.2010.06.037

Cited by 29 publications

(14 citation statements)

References 21 publications

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“…The ethanol mass fraction x 0 E ¼ 0:9557 corresponds to the azeotrope mixture. Since in most cases in Table 2 the ratio of argon to ethanol mole fraction x A =x E > 1 (except cases 12,[20][21][22][36][37][38], the viscosity and thermal conductivity of the mixture are taken equal to those of argon. The corresponding temperature dependencies are plotted in the Supplement Information (Fig.…”

Section: Boundary Segment Momentum Transfer Equations Energy Transfer Equation Species Transfer Equationsmentioning

confidence: 99%

“…The pyrolysis experiments in the presence of radical trappers (toluene) were performed in [18] in order to determine the rate constant of ethanol decomposition reaction into ethylene and water. The synthesis of pyrolytic carbon composites using ethanol as a precursor was reported in [15,21]. It was found that ethanol exhibits much higher deposition rate in comparison with methane.…”

Section: Introductionmentioning

confidence: 99%

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Modelling of ethanol pyrolysis in a commercial CVD reactor for growing carbon layers on alumina substrates

Минаков

Симунин

Ryzhkov

2019

International Journal of Heat and Mass Transfer

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Chemical vapour deposition (CVD) is widely used for preparation of pyrolytic carbons from various precursors. The prediction of deposition kinetics requires deep understanding of all transport phenomena involved. In this work, we perform the computational modelling of ethanol pyrolysis in a commercial CVD reactor (a tube furnace). The reactor is employed for growing carbon layers on alumina substrates. The inlet gas flow is produced by evaporating azeotrope ethanol/water mixture and mixing it with inert gas (argon). The modelling is performed in 3D and 2D statements using Marinov mechanism with 57 species participating in 383 reactions. The heat and species transport is taken into account with temperature dependent physical properties. It is shown that the inlet gas velocity in the 2D statement should be corrected for a meaningful comparison with the 3D case. A good agreement is found between species mole fractions at the substrate position for 3D and 2D statements at low volume flow rates, while at high flow rates some deviations are observed. The temperature at the substrate position is found to be lower than at the reactor wall due to inflow of a colder gas. The main pyrolysis products at moderate temperatures (around 900°C) are water, ethylene, hydrogen, carbon monoxide, and methane. With increasing temperature, the mole fractions of hydrogen, acetylene, and carbon monoxide increase, while those of water and methane become smaller. With increasing ethanol/water volume flow rate, the mole fractions of ethanol and pyrolysis products saturate at some constant values due to incomplete thermal decomposition of ethanol in the reactor volume. The rise of argon flow rate leads to the decrease of pyrolysis products mole fractions due to decrease of residence time. The obtained results can be employed for simulating and analyzing pyrolysis processes in realistic CVD reactors with complex geometry as well as for the development of coupled gas phase and surface reaction model of carbon layer deposition on nanoporous substrates.

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Section: Boundary Segment Momentum Transfer Equations Energy Transfer Equation Species Transfer Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling of ethanol pyrolysis in a commercial CVD reactor for growing carbon layers on alumina substrates

Минаков

Симунин

Ryzhkov

2019

International Journal of Heat and Mass Transfer

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“…Advantages of pyrolysis in CVD have more than conventional pyrolysis techniques. Especially, short process time, rapid and energy-efficient heating process increase production rates and help to obtain more pure carbon [22,23].…”

Section: Introductionmentioning

confidence: 99%

Investigation of activated carbon obtained from the liquid products of pyrolysis in sunflower oil bleaching process

et al. 2018

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Decolourization process of neutralized sunflower oil was carried out with activated carbon products obtained from pyrolysis liquid products. The effect of parameters such as time, temperature, moisture and dosage on bleaching sunflower oil was investigated. It was found that activated carbon samples are an effective adsorbent for decolourization process of sunflower oil. It was determined that the ability of adsorption of the activated carbon samples at 20 °C temperature is higher than that of the bleaching earth which is used for this purpose. The analysis results directly prove that activated carbons remove the unwanted pigments and residues from sunflower oil. Moreover, activated carbon sample A2 has a more positive effect on pigment removal than other activated carbon samples (A1 and A3). 1% of activated carbon sample A2, 0.01% sunflower oil moisture, 20 °C temperature and 30 min contact time are optimal values in a sunflower oil bleaching process. Therefore, these activated carbon samples can be used to bleach sunflower oil instead of bleaching earth.

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“…We illustrate our approach by considering a sample of the carbon/carbon composite (C/C) manufactured by chemical vapor infiltration (CVI) of carbon fiber preform. The CVI process includes deposition of carbon particles from the carbon containing gas, such as methane or ethanol, on the carbon fibers placed in a reactor with elevated temperature and pressure (see Benzinger and Hüttinger [2], Li et al [20] This manufacturing process results in a porous material (typical porosities are in the 2-15% range) with pores having highly irregular shapes, as illustrated in Fig. 1 (Note that other C/C manufacturing methods also produce irregularly shaped pores, see Tomkova et al [38]).…”

Section: Introductionmentioning

confidence: 99%

Characterization and statistical modeling of irregular porosity in carbon/carbon composites based on X‐ray microtomography data

Drach

Tsukrov

2012

Z Angew Math Mech

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Key words Carbon-carbon composites, microcomputed tomography, 3D pores of irregular shapes, statistical analysis, effective elastic properties, design of experiments.Statistical analysis procedure is proposed to characterize volume, shape and orientation distribution of pores in chemical vapor infiltrated carbon/carbon composites. The microstructure data is provided by X-ray microtomography. To characterize orientation distribution of pores, probability distribution functions of pore volume, orientation angles and principal moments of inertia are constructed. Based on this information, a statistically significant range of pore geometry parameters is determined for evaluation of their contribution to the effective elastic properties of the material. Using the design of experiment approach, a subset of 53 pores is selected for the finite element simulations. The results are analyzed to construct a 3-factor stochastic model of a pore contribution to the overall elastic response based on its geometric parameters. It is determined that the non-dimensionalized surface to volume ratio factor plays an important role for pores in this type of material. A 4-factor model incorporating this ratio is proposed. The model is validated by direct finite element simulations for a set of 150 randomly selected pores not included in the initial subset. The accuracy of the proposed approach is compared with the traditionally used approximation of pores by equivalent ellipsoids.

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Chemistry and kinetics of chemical vapor deposition of pyrolytic carbon from ethanol

Cited by 29 publications

References 21 publications

Modelling of ethanol pyrolysis in a commercial CVD reactor for growing carbon layers on alumina substrates

Modelling of ethanol pyrolysis in a commercial CVD reactor for growing carbon layers on alumina substrates

Investigation of activated carbon obtained from the liquid products of pyrolysis in sunflower oil bleaching process

Characterization and statistical modeling of irregular porosity in carbon/carbon composites based on X‐ray microtomography data

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