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72
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Introduction
My research focuses on the chemical mechanisms associated with autoignition and combustion in engines, as well as the associated diagnostic techniques.
This includes probing the high pressure reactivity of fuel/biofuel surrogates by means of classical analytical chemistry and/or spectroscopy techniques, with help of a dedicated device: a Rapid Compression Machine (RCM).
Current research interests include formulation of (bio)fuels, plasma assisted ignition, as well as better RCM characterization.
Additional affiliations
September 2006 - present
Publications
Publications (72)
Plasma-assisted cool flames of n-heptane were generated in the combustion chamber of a rapid compression machine coupled with a nanosecond dielectric barrier discharge, at a pressure of 1.5 bar and temperature TC = 650 K. Increasing of the voltage pulse amplitude at the electrode resulted in a transition from no reactivity to induced cool flame and...
In Rapid Compression Machines (RCM), several phenomena can induce inhomogeneities inside the reaction chamber. The benefits of using a creviced piston have been largely demonstrated through good agreement with the widely used adiabatic core assumption. Still, temperature inhomogeneities due to wall heat transfer cannot be avoided. These induce spat...
Rapid compression machines (RCMs) are widely used to acquire experimental insights into fuel autoignition and pollutant formation chemistry, especially at conditions relevant to current and future combustion technologies. RCM studies emphasize important experimental regimes, characterized by low- to intermediate-temperatures (600–1200 K) and modera...
A synergistic effect on low-temperature autoignition reactivity of blending two high-octane compounds, i.e. cyclopentane and diisobutylene, was observed in engine experiments and ignition delay time measurements at 700–880 K and up to 25 bar with a rapid compression machine. Results show that the low-temperature ignition delay and RON of a cyclopen...
Increasing the efficiency of cellulose hydrolysis is a crucial milestone to enable its use as a platform for the production of renewable chemicals. Consequently, exploring alternative techniques for cellulose dissolution and subsequent depolymerization and hydrolysis remains a pivotal area of research. This study delves into the performance of dive...
Developing a process that performs the lignocellulosic biomass fractionation under milder conditions simultaneously with the depolymerization and/or the upgrading of all fractions is fundamental for the economic viability of future lignin‐first biorefineries. The molten salt hydrates (MSH) with homogeneous or heterogeneous catalysts are a potential...
Understanding the chemical reactions that occur during the low-temperature oxidation of alkenes is crucial for developing advanced energy conversion devices, as alkenes are significant components of realistic fuels. Despite extensive experimental and theoretical studies, the oxidation chemistry of alkenes remains less understood compared to that of...
A wide variety of high temperature experimental data obtained in this study complement the data on the oxidation of the two di-isobutylene isomers presented in Part I and offers a basis for an extensive validation of the kinetic model developed in this study. Due to the increasing importance of unimolecular decomposition reactions in high-temperatu...
Despite decades of research on alkene ozonolysis, the kinetic network of the archetypal case of ethylene (CH2=CH2) with ozone (O3) still lacks consensus. In this work, experimental evidence of a...
A detailed experimental and kinetic modeling study was dedicated to understand the reported octane hyperboosting effect of prenol, by means of the measurement of the ignition delay times of its blends with iso-octane, and measurement of the mole fraction profiles of the fuels and intermediates inside the ULille rapid compression machine. These resu...
Cool flames of diethyl ether were stabilized and extensively studied in a stagnation plate burner. Two conditions were selected, enabling the assessment of the impact of ozone-seeding on the cool flame: In the first case, ozone was seeded to stabilize a lean cool flame with an equivalence ratio of 0.5, and in a second case a stoichiometric flame wa...
Hydrogen can be blended with other surrogate fuels to avoid its hazard as a highly flammable and explosive gas. The effect of hydrogen addition on the ignition delay times of n-pentane, 3-pentanone, and 1-pentene was investigated by measuring the ignition delay times in a rapid compression machine. The experiments were performed at pressures of 10,...
Cyclohexane oxidation chemistry was investigated using a near-atmospheric pressure jet-stirred reactor at T = 570 K and equivalence ratio ϕ = 0.8. Numerous intermediates including hydroperoxides and highly oxygenated molecules were detected using synchrotron vacuum ultraviolet photoelectron photoion coincidence spectroscopy. Supported by high-level...
Di-isobutylene has received significant attention as a promising fuel blendstock, as it can be synthesized via biological routes and is a short-listed molecule from the Co-Optima initiative. Di-isobutylene is also popularly used as an alkene representative in multi-component surrogate models for engine studies of gasoline fuels. However, there is l...
tert-butyl hydroperoxide (tBuOOH) is a common intermediate in the oxidation of organic compounds that needs to be accurately quantified in complex gas mixtures for the development of chemical kinetic models of low temperature combustion. This work presents a combined theoretical and experimental investigation on the synchrotron-based VUV single pho...
The application of oxymethylene ethers as an alternative fuel (additive) produced via carbon capture and utilization can lead to lower CO2 and particulate matter emissions compared to fossil fuels. To improve the understanding of the pyrolysis and oxidation chemistry of oxymethylene ether-2 (OME-2), a combined experimental and kinetic modeling stud...
The viability of the use of ortho-cresol as a bio-blendstock or antiknock additive from lignocellulosic biomass is assessed; Ignition delays of ortho-cresol within blends with iso-octane are measured with the ULille rapid compression machine, and compared with results from the literature; It is shown that ortho-cresol has a strong inhibiting effect...
In order to unravel the reaction pathways relevant to anisole co-oxidation within a fuel blend, a detailed study of isooctane/anisole blends was performed with the ULille RCM. Ignition delays as well as mole fraction profiles were measured during a two-stage ignition delay using sampling and GC techniques. These results are used to validate a kinet...
Conventional combustion has been exploited for power generation purposes since ancient times. Considering all relevant analyses of primary energy consumption, it is obvious that worldwide it will still play a major role in heat generation and will only slowly be replaced in generation of electricity. Despite unpreceded breakthroughs, growing capaci...
While there is consensus on the fact that OOQOOH radicals, produced by two oxygen additions from alkyl radicals, are the heart of the low-temperature oxidation of alkanes, the determination of the isomeric distribution and the quantification of their derived products (ketohydroperoxides and diones) are still a challenge. For the first time, heavy o...
This work reports on the selective on line identification of polycyclic aromatic hydrocarbons (PAHs) formed in a low-pressure methane sooting flame, carried out using the double imaging Photoelectron Photoion Coincidence Spectroscopy method (i2PEPICO) on the DESIRS VUV beamline at the synchrotron SOLEIL. Generally, this work demonstrates the capabi...
Through the use of tunable vacuum ultraviolet light generated by the DESIRS VUV synchrotron beamline, a jet-stirred reactor was coupled for the first time to an advanced photoionization mass spectrometer based upon a double imaging PhotoElectron PhotoIon COincidence (i2PEPICO) scheme. This new coupling was used to investigate the low-temperature ox...
Waste-to-energy is a key driver to achieve a clean and virtuous renewable cycle. Among others, the processes to convert organic matter in wastes from automotive residues, mainly composed of rubbers and foams (ethylene propylene diene-monomer EPDM, polyurethane PUR), polyolefins plastics (polypropylene PP, polyethylene PE), styrenic plastics (acrylo...
Ignition delays of stoichiometric mixture of 2,5- dimethyltetrahydrofuran/O2/inert mixtures were measured at temperatures ranging from 650 to 1300 K in a RCM and in a shock tube. Operating pressures ranged from 10 to 40 bar at higher temperature (ST) and 10 to 20 bar at lower temperatures (RCM). The ignition delay times exhibit a slight deviation f...
A detailed study on the ignition of ferrocene-containing mixtures has been undertaken in a Rapid Compression Machine (RCM). Two hydrocarbon fuels, isooctane and 3-hexene, were investigated in order to assess the hypothesis of an inhibiting effect of iron oxide particles on HO2 radicals and H2O2. Ignition delays were measured at core gas temperature...
The first detailed kinetic model of the low-temperature oxidation of tetrahydrofuran has been developed. Thermochemical and kinetic data related to the most important elementary reactions have been derived from ab initio calculations at the CBS-QB3 level of theory. A comparison of the rate constants at 600 K obtained from these calculations with va...
The complex interactions between hundreds of species linked within thousands of reactions continue to be a challenge to model and analyze. Development of approaches to analyze and to performant, accurate and fast simulations of detailed kinetic chemistry applied to a biofuel, ethanol, ignition process in Rapid Compression Machine (RCM) combustion c...
This paper reports the on-line identification of polycyclic aromatics hydrocarbons (PAHs) in a low pressure methane sooting flame, performed for the first time using the i2PEPICO method (double imaging Photoelectron Photoion Coincidence Spectroscopy) on the DESIRS VUV beamline at synchrotron SOLEIL. The objective of this study is to highlight the c...
The oxidation of 2-methyltetrahydrofuran (2-MTHF) has been experimentally studied in a rapid compression machine. The ignition delays of stoichiometric 2-MTHF/O2/inert mixtures were measured for a wide range of conditions: Top dead center pressure ranging from 0.3 to 2.1 MPa and core gas temperatures between 640 K and 900 K. Two-stage ignition is o...
2017 Elsevier Ltd Rapid compression machines (RCMs) are widely used to acquire experimental insights into fuel autoignition and pollutant formation chemistry, especially at conditions relevant to current and future combustion technologies. RCM studies emphasize important experimental regimes, characterized by low- to intermediate-temperatures (600–...
The chemistry associated with low-temperature oxidation and ignition of tetrahydrofuran (THF) has been probed through experimental work in two distinct devices: a rapid compression machine (RCM) and a jet-stirred reactor (JSR). Ignition delays of stoichiometric THF/O-2/inert mixtures have been measured for pressures ranging from 0.5 to 1.0 MPa and...
A novel experimental scheme to study the ignition of combustible mixtures at high pressures under the action of a high-voltage nanosecond discharge has been developed. The experiments were performed in the combustion chamber of a Rapid Compression Machine (RCM) with a specially designed system of electrodes. A nanosecond surface dielectric barrier...
A detailed experimental study was performed in a rapid compression machine to investigate the effect of several EGR and syngas components on the autoignition of natural gas. Ignition delays of methane, natural gas, and mixtures of natural gas with hydrogen, carbon monoxide, carbon dioxide, and water were measured for temperatures ranging from 870 t...
Surface nanosecond dielectric barrier discharge has been studied in air and at pressures ranging from 1 to 5 bar, with a coaxial geometry of the electrodes for positive and negative polarities of the high-voltage pulses. Pulses of a 24-55 kV amplitude on the electrode, positive or negative polarity, 20 ns duration, 0.5 ns rise time and 10 Hz repeti...
New experimental results for the oxidation of n-butylbenzene, a component of diesel fuel, have been obtained using three different devices. A rapid compression machine has been used to measure autoignition delay times after compression at temperatures in the range 640–960 K, at pressures from 13 to 23 bar, and at equivalence ratios from 0.3 to 0.5....
The results of a novel technique for the quantification of oxygen in an isothermal turbulent free jet using toluene laser
induced fluorescence (LIF) are presented. This method relies on the red-shift of the toluene LIF emission spectrum with increasing
oxygen concentration. Evaluating the LIF signal ratio from two different wavelength regions simul...
The autoignition chemistry of lean n-propylcyclohexane/''air'' mixtures ( = 0.3, 0.4, 0.5) was investigated in a rapid compression machine at compressed gas temperatures ranging from 620 to 930 K and pressures ranging from 0.45 to 1.34 MPa. Cool flame and ignition delay times were measured. Cool flame delay times were found to follow an Arrhenius b...
Vehicles fuelled by natural gas/hydrogen blends are a first step toward a significant hydrogen deployment. These natural gas/hydrogen blends can partially solve pollution problems and increase air quality. Hydrogen is a clean fuel with no carbon emissions; the combustion of hydrogen produces only water and a reduced amount of nitrogen oxides, that...
Vehicles fuelled by natural gas/hydrogen blends are a first step toward a significant hydrogen deployment. These natural gas/hydrogen blends can partially solve pollution problems and increase air quality.
Hydrogen is a clean fuel with no carbon emissions; the combustion of hydrogen produces only water and a reduced amount of nitrogen oxides, that...
The autoignition of a series of C4 to C8 fatty acid methyl esters has been studied in a rapid compression machine in the low and intermediate temperature region (650–850 K) and at increasing pressures (4–20 bar). Methyl hexanoate was selected for a full investigation of the autoignition phenomenology, including the identification and determination...
A detailed chemical kinetic mechanism has been developed to study the oxidation of the straight-chain isomers of hexene over a wide range of operating conditions. The main features of this detailed kinetic mechanism, which includes both high and low temperature reaction pathways, are presented and discussed with special emphasis on the main classes...
The ignition delay times of CH4/C2H6/C3H8 mixtures representative of an average natural gas composition have been measured in a rapid compression machine (RCM) at the University of Lille. The pressure at the end of compression (EOC) varied from 13 to 21 bar and the core gas temperature ranged from 850 to 925 K. Zero-dimensional modelling starting f...
The oxidation and autoignition of five undiluted stoichiometric mixtures, n-heptane/toluene, isooctane/toluene, isooctane/1-hexene, 1-hexene/toluene, and isooctane/1-hexene/toluene, has been studied in a rapid compression machine below 900 K. Ignition delay times of two- and one-stage autoignition have been measured and compared to those for pure h...
This article reports a detailed reaction mechanism able to predict our experimental data obtained for methane/benzene and n-heptane/benzene mixtures at low and high temperature. The high temperature data consist in mole fraction profiles of stable and reactive species measured in low-pressure (5.19×10−2 bar) stoichiometric premixed CH4/O2/N2 and CH...
Autoignition delay times have been measured in a rapid compression machine at Lille at temperatures after compression from 630 to 840 K, pressures from 8 to 14 bar, \Phi = 1 and for a iso octane/1 hexene mixture containing 82% iso-octane and 18% 1 hexene. Results have shown that this mixture is strongly more reactive than pure iso-octane, but less...
New kinetic mechanisms for the oxidation of 1-pentene and 1-hexene at low temperature have been developed that require important improvements of the kinetic rules used by the EXGAS system for the automatic generation of mechanisms. This paper details the changes or additions necessary for the definition of the specific generic reactions involving a...
The chemistry of oxidation and autoignition of 1-, 2-, and 3-hexene has been studied after rapid compression between 630 and 850K for stoichiometric mixtures with “air.” The phenomenology of autoignition has been recognized, and intermediate products formed before autoignition have been identified and analyzed. They mainly comprise of hexadienes, O...
The interaction of diuron and isoproturon herbicides with beta-cyclodextrin is conducive to the formation of inclusion compounds in aqueous solution as well as in the solid state. The physico-chemical study of these complexes was carried out by various analytical techniques such as ultraviolet (UV), Fourier transform infrared (FT-IR), Raman, X-ray...
The oxidation chemistry of aromatics leading to their autoignition at low temperature is of importance to the onset of knock in gasoline engine, the ignition process in diesel, and HCCI engines, and the emission pollutants. Autoignition of mixtures of toluene with n-pentane, n-heptane, trimethyl-2,2,4-pentane, or 1-hexene was studied. The mutual ef...
In order to clarify possible interactions between the oxidation mechanisms of hydrocarbons in a practical fuel in the low and intermediate temperature region, several binary mixtures, as well as a surrogate fuel composed of a ternary mixture of hydrocarbons representative of the chemical families found in petrol (toluene, isooctane and 1-hexene) we...
The autoignition of n-butylbenzene is studied in a rapid compression machine over the pressure range 13-23 bar, between 640 and 960 K, and for three equivalence ratios φ: 0.3, 0.4, and 0.5. Two-stage ignitions are observed at the lowest pressures between 660 and 740 K and for φ = 0.5 and 0.4. A negative temperature coefficient region is present at...
Natural gas / hydrogen / O 2 / inert of various compositions are ignited inside a RCM. The effects of the temperature, the pressure and the composition are studied, and the results are compared with simulations from two well-validated natural gas mechanisms. Introduction Natural gas is considered an interesting candidate automotive fuel for several...
This study examines how the detailed thermokinetic models available for individual components are able to reproduce the experimental results of autoignition by rapid compression of a ternary surrogate fuel composed of a 47/18/35 (molar percents) mixture of isooctane, 1-hexene, and toluene. First a model of oxidation of an isooctane/1-hexene mixture...
In this work experimental and numerical studies of n-decane/air diffusion flames have been undertaken, n-decane mimicking the paraffin behaviour in diesel fuel combustion. This work reports the detailed chemical structure of laminar counterflow diffusion flames of n-decane at 476 K and atmospheric pressure. Mole fraction profiles of reactants (n-C...
