Electron Kinetics in He/CH₄/CO₂ Mixtures Used for Methane Conversion

Abstract

In this work the electron kinetics in He/CH 4 /CO 2 mixtures used for CH 4 conversion is studied, including the contribution of H 2 and CO formed in the discharge, as an initial step to model the reforming of natural gas for syngas production in a dielectric barrier discharge. The electron Boltzmann equation for a swarm in the hydrodynamic regime is solved in mixtures of He/CH 4 /CO 2 /CO/H 2 . The method used takes into account nonconservative terms and the full angular dependency of the electron velocity distribution function (evdf). The role of He and the effect of the change in composition by conversion of reagents into products in the evdf, transport parameters, reaction rates, and power losses are discussed and quantified.

The Quest for Value‐Added Products from Carbon Dioxide and Water in a Dielectric Barrier Discharge: A Chemical Kinetics Study

“…Mosto ft he research has been based on pure CO 2 splitting [27][28][29][30][31][32][33][34][35][36] or dry reforming of methane. [12,14,[37][38][39][40][41][42][43][44][45][46][47][48][49][50] Pure H 2 Op lasmasf or the productiono fh ydrogen have also been extensively studied. [51][52][53][54][55] However,r esearch on the simultaneous conversionso fC O 2 and H 2 Oi ntos yngas or oxygenated products by plasma is very limited.…”

“…Because of its advantages over conventional reforming technologies, a lot of research has already been devoted to the plasma‐based conversion of greenhouse gases into value‐added products. Most of the research has been based on pure CO 2 splitting or dry reforming of methane . Pure H 2 O plasmas for the production of hydrogen have also been extensively studied .…”

Gliding Arc Plasmatron: Providing an Alternative Method for Carbon Dioxide Conversion

“…Due to its increasing interest, many researchers are investigating the splitting of CO 2 into CO and O 2 by plasma, both in pure CO 2 as well as in a mixture with other gases like CH 4 , H 2 , or H 2 O . When CO 2 is mixed with such a hydrogen source, value‐added chemicals can be produced, such as syngas, methanol, formaldehyde and formic acid.…”

“…When CO 2 is mixed with such a hydrogen source, value‐added chemicals can be produced, such as syngas, methanol, formaldehyde and formic acid. Most research on plasma‐based CO 2 conversion is done with one of the following types of plasmas: dielectric barrier discharges (DBD), microwave (MW) plasmas, nanosecond‐pulsed plasmas (NSP), spark discharges, and gliding arc discharges . A lot of research goes into improving the energy efficiency of the process.…”

Modeling for a Better Understanding of Plasma-Based CO2 Conversion

“…In the last decade, the research on plasma-based CO 2 conversion experienced a clear revival, and quite some plasma chemistry models have been developed in literature, for either pure CO 2 splitting [7, or CH 4 (of interest for hydrocarbon reforming) [49][50][51][52], as well as in various mixtures, that is, CO 2 /CH 4 [53][54][55][56][57][58][59][60][61][62][63][64][65][66], CH 4 /O 2 [66][67][68][69][70][71][72], CO 2 /H 2 O [73], and CO 2 /H 2 [74,75], of interest for producing value-added chemicals, or in mixtures of CO 2 /N 2 [76,77] or CH 4 /N 2 [78][79][80][81][82][83], more closely mimicking reality, as N 2 is a major component in effluent gases. Recently, we gave an overview of such 0D models for plasma-based CO 2 and CH 4 conversion [84], and we also presented a very comprehensive plasma chemistry model for CO 2 and CH 4 conversion in mixtures with N 2 ,O 2 , and H 2 O [85].…”