Kinetics of surface reactions in carbon deposition from light hydrocarbons

Koyo Norinaga, Klaus J. Hüttinger

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

Carbon deposition from ethene, ethine and propene as a function of pressure was studied at various temperatures and two different surface area/volume ratios. Deposition rates as a function of pressure of all hydrocarbons indicate Langmuir-Hinshelwood kinetics which suggests that the deposition process is controlled by the heterogeneous surface reactions (growth mechanism). These kinetics are favored at decreasing reactivity (C3H6>C2H2>C2H 4), decreasing temperature and residence time as well as increasing surface area/volume ratio. A linear rate increase at high pressures suggests that carbon is additionally or preferentially deposited by aromatic condensation reactions between polycyclic aromatic hydrocarbons large enough to be physisorbed or condensed on the substrate surface (nucleation mechanism). The results completely agree with earlier results obtained with methane.

Original languageEnglish
Pages (from-to)1509-1514
Number of pages6
JournalCarbon
Volume41
Issue number8
DOIs
Publication statusPublished - Jun 18 2003

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

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