Detailed kinetic modeling of gas-phase reactions in the chemical vapor deposition of carbon from light hydrocarbons

Koyo Norinaga, Olaf Deutschmann

Research output: Contribution to journalArticle

128 Citations (Scopus)

Abstract

The chemical kinetics of the pyrolysis of the hydrocarbons ethylene, acetylene, and propylene are modeled in detail under conditions relevant to the chemical vapor deposition of pyrolytic carbon. A mechanism that consisted of 227 species and 827 reactions (most of which are reversible) is developed and computed using a software package designed for computing time-dependent homogeneous reaction systems. Experimental results used for model validation are obtained using a vertical flow reactor at 900°C, pressures of 2-15 kPa, and residence times of up to 1.6 s. The products are analyzed using on-line and off-line gas chromatography. Computational and experimental results are compared for more than 30 products, including hydrogen, small hydrocarbons (ranging from methane to C4, species), and aromatic hydrocarbons (ranging from benzene to coronene), The resulting reaction model predicts the profiles of the major pyrolysis products (mole fractions of > 10-2) of the three hydrocarbons, as a function of both residence time and pressure, with satisfactory accuracy. It also predicts the mole-fraction profiles of minor compounds, ranging from polycyclic aromatic hydrocarbons (PAHs) to naphthalene, fairly well; however, it significantly underpredicts the larger PAHs. The deviation increases as the molecular mass of the PAHs increases. Sensitivity and reaction-rate analyses were also conducted to identify crucial reaction steps.

Original languageEnglish
Pages (from-to)3547-3557
Number of pages11
JournalIndustrial and Engineering Chemistry Research
Volume46
Issue number11
DOIs
Publication statusPublished - May 23 2007

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Polycyclic Aromatic Hydrocarbons
Polycyclic aromatic hydrocarbons
Hydrocarbons
Chemical vapor deposition
Carbon
Gases
Kinetics
Pyrolysis
Aromatic Hydrocarbons
Acetylene
Aromatic hydrocarbons
Methane
Molecular mass
Naphthalene
Benzene
Reaction kinetics
Software packages
Gas chromatography
Propylene
Reaction rates

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

Detailed kinetic modeling of gas-phase reactions in the chemical vapor deposition of carbon from light hydrocarbons. / Norinaga, Koyo; Deutschmann, Olaf.

In: Industrial and Engineering Chemistry Research, Vol. 46, No. 11, 23.05.2007, p. 3547-3557.

Research output: Contribution to journalArticle

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