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Abstract—This paper reports on studies obtained from RF–driven atmospheric-pressure plasma-jet excitation ofmethane andethane. Differentiation with other works is achieved in that othershave considered hydrocarbon decomposition at either low pressureor high temperature. In our experiments, we can clarifythe effect of pure-plasma treatment of hydrocarbons, as opposedto the thermal effect of gas heating that results in pyrolysis.Gas-chromatography analysis was used to detect and quantify themain decomposition products. Kinetic modeling of the pertinentchemistry was performed by dividing the reactive system in twomain parts: a plasma region where the electron impact processesleading to decomposition are considered and a postplasma regionwhere recombination of nonstable species occurs. A reasonablequalitative agreement between the experimentally measuredby-product concentrations and the calculations was achieved. It isobserved that our proposed recombination mechanism correctlypredicts ethane and ethylene formation from a CH4 dischargeandmethane, ethylene, propane, and acetylene formation from theC2H6 discharge. By means of calculations, the main role of radicalsin the pertinent hydrocarbon chemistry under nonthermalplasma conditions is confirmed.INTEREST in nonthermal plasmas as a tool to alter combustionproperties of hydrocarbons has increased in the lastseveral years. Some nonthermal-plasma technologies have beendeveloped to pretreat fuels just prior to combustion. A nonthermalplasma signifies less waste of energy in terms of heatdeposited in the whole gas (air + fuel), because the energeticelectrons are responsible for starting the cracking reactions ofhydrocarbon molecules [1].Some works in the field of plasma-assisted combustion havebeen carried out using a dielectric-barrier-discharge reactorto activate pure hydrocarbons and hydrocarbon/air mixtureswith very promising results [2], [3]. But it is of paramountimportance to better understand the chemical-activation mechanismsinvolved in these novel techniques to achieve practicalapplications.In the past several years at the Los Alamos National Laboratory,a new nonthermal plasma source called the atmosphericpressureplasma jet (APPJ), was developed as a system fora number of applications, such as materials processing and surface decontamination [4], [5]. The APPJ discharge is essentiallydifferent from other atmospheric-pressure plasmasources, because it is characterized by a stable, volumetric, andhomogeneous discharge, which fills the volume between theelectrodes [6]—attributes that make it a potential techniqueto study and model the basic nonthermal plasma triggeredhydrocarbon chemistry.Some of the characteristics of the APPJ have been alreadystudied [5]. It produces a homogeneous discharge atatmospheric pressure using 13.56-MHz RF power的意思去问你老师
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