A comprehensive study of CO2 addition on soot particle formation during ethylene pyrolysis in a flow reactor

Junyu Mei, Xiaoqing You, Chung K. Law

Research output: Contribution to conferencePaperpeer-review

Abstract

Effects of CO2 on soot particle formation during ethylene pyrolysis were investigated in a laminar flow reactor with different CO2 additions (0-99.5% in mole fraction), with the distribution of the soot particle size examined using quantitative dilution sampling. Kinetic modeling of the gas-phase reactions including soot precursor chemistry was also conducted to analyze the experiment observations. Results show that a small amount of CO2 (0 - 10%) tends to promote soot formation by increasing the total number and volume of soot particles and reducing the soot induction delay time, whereas an increase of the CO2 mole fraction from 10% to 99.5% leads to an obvious diminution of soot nucleation and mass growth rate. The simulated mole fractions of benzene and pyrene at the reactor outlet first increase and then decrease as the CO2 concentration increases. The reaction path analysis indicates that CO2 affects soot formation mainly through generating the hydroxyl radicals. A small production of hydroxyl increases the propargyl concentration, and thereby promotes the formation of soot precursors, while excessive hydroxyl leads to more significant oxidation that inhibits soot formation.

Original languageEnglish (US)
StatePublished - Jan 1 2019
Event12th Asia-Pacific Conference on Combustion, ASPACC 2019 - Fukuoka, Japan
Duration: Jul 1 2019Jul 5 2019

Conference

Conference12th Asia-Pacific Conference on Combustion, ASPACC 2019
CountryJapan
CityFukuoka
Period7/1/197/5/19

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Energy Engineering and Power Technology
  • Fuel Technology
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'A comprehensive study of CO<sub>2</sub> addition on soot particle formation during ethylene pyrolysis in a flow reactor'. Together they form a unique fingerprint.

Cite this