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This study details the thermal dissociation kinetics of methyl formate (MF) radicals, crucial for understanding biodiesel combustion. Experimental and theoretical methods revealed key reaction pathways and rate coefficients, improving combustion simulations.

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Area of Science:

  • Chemical Kinetics
  • Combustion Science
  • Computational Chemistry

Background:

  • Methyl formate (MF) is the simplest ester and a component of biodiesel.
  • Understanding the thermal dissociation kinetics of MF-derived radicals is essential for accurate combustion modeling of biodiesel surrogates.

Purpose of the Study:

  • To characterize the thermal dissociation kinetics of radicals formed by H atom abstraction from methyl formate (MF).
  • To determine rate coefficients for key reactions involving MF radicals and their decomposition products.
  • To validate theoretical calculations through experimental measurements and assess their impact on combustion simulations.

Main Methods:

  • Experimental: Excimer laser photolysis of Cl2 to initiate reactions with MF in the gas phase.
  • Measurement: Time-resolved species profiles using photoionization mass spectrometry (400-750 K, 10 Torr).
  • Theoretical: Ab initio-based theoretical kinetics calculations and master equation simulations.

Main Results:

  • Calculated theoretical rate coefficients for H-abstraction reactions Cl + MF → HCl + CH3OCO and Cl + MF → HCl + CH2OCHO.
  • Determined dissociation barriers and theoretical rate coefficients for CH3OCO → CH3 + CO2 and CH2OCHO → CH2O + HCO.
  • Validated theoretical branching fractions and rate coefficients by modeling experimental data, showing excellent agreement.

Conclusions:

  • The study provides critical kinetic parameters for MF radicals, including H-abstraction and dissociation pathways.
  • Bimolecular reactions involving MF radicals and chlorine species were identified as crucial for accurate modeling.
  • Incorporating these kinetic parameters significantly impacts combustion simulations of larger methyl esters used as biodiesel surrogates.