The Effect of Carbon–Carbon Double Bonds on the Combustion Chemistry of Small Fatty Acid Esters
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Bin Yang
Abstract
Environmentally friendly biodiesel is a mixture of saturated and unsaturated methyl (or ethyl) esters of long-chain fatty acids. To experimentally examine the effect of C=C double bonds on the combustion chemistry of fatty acid esters, low-pressure premixed laminar flames of four small esters have been studied using flame-sampling molecular-beam mass spectrometry. Mole fraction profiles of reactants, products, and well-identified stable and reactive combustion intermediates in flames of the saturated species methyl propanoate (CH3CH2COOCH3) and its isomer ethyl acetate (CH3COOCH2CH3) have been compared with results from flames of the unsaturated fuels methyl propenoate (CH2CHCOOCH3) and vinyl acetate (CH3COOCHCH2) flames. A total of eight flames have been studied, with two fuel-rich flame conditions investigated (fuel-equivalence ratios φ=1.2 and 1.56) for each fuel. In addition, the underlying oxidation chemistry at these premixed flame conditions has been investigated using a detailed chemical kinetic reaction mechanism, which is largely based on a previously proposed model for saturated esters [B. Yang et al., Phys. Chem. Chem. Phys. 13 (2011) 7205]. The combined results provide a detailed understanding of the similarities and differences between the combustion of saturated vs. unsaturated esters. Meanwhile, the isomeric and stoichiometric effects on their combustion chemistry are also addressed. In this paper, experimental and modeling details are discussed with a special focus on the different reaction pathways.
© by Oldenbourg Wissenschaftsverlag, Ithaca, NY 14853, Germany
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Articles in the same Issue
- From flames to functional materials — The multiple facets of diagnostic techniques in Physical Chemistry
- High-Temperature Measurements of the Rate Constants for Reactions of OH with a Series of Large Normal Alkanes: n-Pentane, n-Heptane, and n-Nonane
- Experimental and Numerical Investigations of Ferrocene-Doped Propene Flames
- Non-Equilibrium Kinetic Studies of Plasma-Assisted Combustion using Laser-Based Diagnostics
- Coke Formation in Steam Reforming of Natural Gas over Rhodium/Alumina Catalysts: An Atomic Force Microscopy Study using the Oscillating Friction Mode
- Gas-Temperature Imaging in a Microwave-Plasma Nanoparticle-Synthesis Reactor Using Multi-Line NO-LIF Thermometry
- Identification of Tetrahydrofuran Reaction Pathways in Premixed Flames
- Competing Channels in the Propene + OH Reaction: Experiment and Validated Modeling over a Broad Temperature and Pressure Range
- The Effect of Carbon–Carbon Double Bonds on the Combustion Chemistry of Small Fatty Acid Esters
- PLIF Thermometry Based on Measurements of Absolute Concentrations of the OH Radical
- Diode Laser Induced Fluorescence for Gas-Phase Diagnostics
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- Process Control of CVD Deposition of Nanocrystalline Diamond Films by Plasma Diagnostics
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- On the Temperature Dependence of the Thermal Electron Attachment to SF6, SF5Cl, and POCl3
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- Low Energy Electron Point Source Microscopy of Two-Dimensional Carbon Nanostructures
- High Resolution IR Spectroscopy of the C–H Stretch Bands of Benzene Monomer and Dimer in Helium Nanodroplets
- Dispersed Fluorescence Spectra of 1H- and 1D-Indazole
