Zhongkai Liu

Zhongkai Liu
Tsinghua University | TH · CCE

Doctor of Engineering
Carbon Neutrality

About

21
Publications
2,939
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103
Citations
Introduction
Tsinghua University

Publications

Publications (21)
Article
The present study explores the chemical kinetics of plasma-assisted methane dry reforming (340 K, 30 Torr) in a flow reactor activated by a nanosecond pulsed dielectric barrier discharge (DBD). Experiments are conducted with the inlet CO2/CH4 mol ratios varying from 0.4 to 2.8 in CH4/CO2/Ar mixture. Synchrotron vacuum ultraviolet photoionization ma...
Article
Understanding the formation and evolution of N2O in NH3-fueled combustion has implications for pollutant control and for developing a more accurate kinetic model of NH3. A previous study on an NH3/N2O/N2 mixture showed a significant discrepancy between experimental measurements and modeling predictions. The importance of the highlighted reaction NH...
Article
A combined experimental and theoretical study was conducted to investigate the weight growth routes from 2-naphthylmethyl radical to tricyclic aromatics. Co-pyrolysis of 2-(chloromethyl)naphthalene with two C3H4 isomers (allene and propyne) were experimentally studied using the flash pyrolysis microreactor employing synchrotron vacuum ultraviolet p...
Conference Paper
Nitrogen-contained fuels have drawn considerable interest in recent years as a primary source of NOx in combustion and as potential energetic propellants. Although some experimental works have been conducted for nitrogen-containing compounds combustion, the ignition data of two typical nitrogen-contained fuels, nitrates/nitrites, are still scarce....
Article
Full-text available
The chemical kinetics of plasma-assisted low-temperature oxidation of n-butane (n-C4H10, 340 K, 30 Torr) is investigated by synchrotron vacuum ultraviolet photoionization mass spectrometry (SVUV-PIMS) and kinetic modeling. Species measurements are conducted in a flow reactor activated by a nanosecond discharge using SVUV-PIMS. Detailed species iden...
Article
Improving the fire resistance of polymeric materials is an important research problem, which is solved using various flame retardants. Organophosphorus compounds are among the most effective and environmentally friendly flame retardants. This paper reports an experimental, theoretical, and kinetic modeling study of the conversion of triphenyl phosp...
Article
Full-text available
The low-temperature auto-ignition chemistry of isopropyl nitrate (iPN) was experimentally and numerically investigated in the present study. The ignition delay times (IDTs) of iPN were measured stoichiometrically over a temperature range of 560–600 K at effective pressures of 5 and 10 bar in a rapid compression machine. A two-stage ignition phenome...
Conference Paper
The chemical kinetics of low-temperature oxidation of ammonia (~340 K, 30 Torr) activated by a nanosecond discharge is explored by electron-ionization molecular beam mass spectrometry (EI-MBMS) and kinetic modeling. Species mole fractions are measured under different oxygen concentrations and peak voltages. The fuel consumption and the formation of...
Article
Full-text available
Methacrolein is a typical α, β-unsaturated aldehyde in the combustion of various hydrocarbons and oxygenated biofuels. The oxidation behavior of fuels that contain resonant C=C and CHO groups in the molecular structure has not been well established in the literature. Understanding the effects of these functional groups on oxidation chemistry is als...
Article
Full-text available
A combination of experimental and kinetic modeling study is performed to explore synergistic effects between toluene and C3H4 isomers on the formation of polycyclic aromatic hydrocarbons (PAHs) and pyrolysis reactivity. Co-pyrolysis of toluene-allene and toluene-propyne is investigated in a flow reactor employing synchrotron vacuum ultraviolet phot...
Article
Full-text available
Larger ethers such as diethyl ether (DEE) and di-n-propyl ether (DPE) have different oxidation behavior (double-NTC behavior) compared to the simplest dimethyl ether (DME). Such phenomena are interpreted with different reactions and processes in different ether kinetic models, which also predict different formation pathways of oxidation intermediat...
Article
Unsaturated aldehydes such as butenal are essential intermediates in the combustion of various alkenes and oxygenated biofuels. 2-Butenal is a typical intermediate included in the core mechanism, containing a C=C double bond adjacent to an aldehyde group. In the present work, the oxidation of 2-butenal is studied in a jet-stirred reactor (JSR) at a...
Article
Full-text available
The combustion of zero-carbon and low-carbon fuels such as hydrogen, ammonia, electronic fuels, and biofuels is fundamental to achieving carbon neutrality. And the efficient utilization of synthetic jet fuels, fused-ring hydrocarbons, and multiple mixed fuels is important for developing advanced aerospace technologies. Combustion kinetics studies o...
Article
Full-text available
Propanal (C2H5CHO) and acetone (CH3COCH3), the C3 carbonyl compound isomers, are the main byproducts of bio-alcohol combustion. In this work, the reaction rate coefficients between propanal/acetone and hydroperoxyl radicals (HO2) over 500–2000 K and 0.01–100 atm were obtained by the RRKM/master equation method based on high-level quantum chemical c...
Article
The low reactivity of some fuels restricts their oxidation experiments at temperatures lower than a specific threshold value. The oxidation of fuel exhibiting low reactivity can be initiated in practical combustors by other highly reactive components at lower temperatures beyond this threshold. To meet the lack of corresponding experimental study,...
Article
Unique resonance stabilization features of R and QOOH radicals of 2,5-hexanedione [CH3C(=O)CH2CH2C(=O)CH3] facilitated the investigation on the roles of carbonyl group in the oxidation of ketones. This work presents the first study on the speciation from the oxidation of 2,5-hexanedione. A fuel-lean (ϕ=0.5) 2,5-hexanedione/O2/Ar mixture was investi...
Article
This work investigates the reaction kinetics of the thermal decomposition of dimethoxymethane (DMM) and 1,2-dimethoxyethane (1,2-DME), which are both representative molecules of the promising clean polyether fuels. Pyrolysis experiments are carried out with helium diluted mixtures containing individual fuels in a flow tube at two different pressure...
Article
Nonequilibrium plasma has a great potential in the lean combustion of gasoline engines. However, fundamental studies on plasma-assisted combustion on gasoline components are limited. In the present study, Low-temperature oxidation behaviors for n-heptane and iso-octane in a plasma flow reactor were investigated. Species measurements were performed...
Article
Full-text available
Furans are an important class of compounds that can be thermochemical or enzymatically produced from biomass. Despite of their importance little is known about the thermal decomposition of furans with oxygenated substituents. In this work, the influence of the -CH3, -CH2OH and -CHO functional groups on the molecular and radical decomposition chemis...
Article
Diisopropyl ether (DIPE) is considered as a promising gasoline additive due to the favorable blending Reid vapor pressure and the low water solubility. To get a good understanding of the DIPE oxidation chemistry, oxidation experiments of a stoichiometric mixture of DIPE/O2/Ar/Kr were performed in a jet-stirred reactor (JSR) at atmospheric pressure...

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