Investigation of mechanistic aspects of the catalytic CO2 reforming of methane in a dielectric-barrier discharge using optical emission spectroscopy and kinetic modeling

Kraus, Martin; Egli, Walter Alfredo; Haffner, Ken; Eliasson, Baldur; Kogelschatz, U.; Wokaun, Alexander

doi:10.1039/b108040g

Cited by 115 publications

(94 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The significance peak for CO was found around 519.8 nm [31]. According to Kraus et al, the peak observed at 297 is due to the third positive system of CO [32]. The peak at 290 nm due to CO 2 + [33] is missing in our study.…”

Section: Optical Emission Spectra (Oes)contrasting

confidence: 44%

DBD Plasma Assisted CO2 Decomposition: Influence of Diluent Gases

2017

View full text Add to dashboard Cite

Carbon dioxide (CO 2 ) partial reduction to carbon monoxide (CO) and oxygen has been conducted in a dielectric barrier discharge reactor (DBD) operating a packed bed configuration and the results are compared with that of no packing condition. The effect of diluent gas is studied to understand the influence on dielectric strength of the plasma gas on CO 2 splitting, with the objective of obtaining the best CO selectivity and high energy efficiency. Typical results indicated that among N 2 , He and Ar gases, Ar showed the best decomposition efficiency. Glass beads packing has a strong influence on the performance, probably due to the enhanced field strength due to dielectric nature of the packed material. In a similar manner, Ar mole ratio in the gas mixture also played a significant role, where the maximum CO 2 conversion of 19.5% was obtained with packed DBD at CO 2 :Ar ratio 1:2. The best CO yield (16.8%) was also obtained under the same conditions. The highest energy efficiency was found to be 0.945 mmol/kJ. The activated species formed inside the CO 2 plasma were identified by optical emission spectroscopy.

show abstract

Section: Optical Emission Spectra (Oes)contrasting

confidence: 44%

DBD Plasma Assisted CO2 Decomposition: Influence of Diluent Gases

2017

View full text Add to dashboard Cite

show abstract

“…This, also called the CO 2 reforming of methane, is an endothermic reaction, needing energy to surpass its activation barrier. This energy is provided by electrons that are energetic enough to initiate this process by decomposing CO 2 into CO and O radicals, as is also suggested by [1] and used in [2]:…”

Section: Introductionmentioning

confidence: 90%

CO₂valorization by means of Dielectric Barrier Discharge

Machrafi

Cavadias

Amouroux

2011

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Abstract. As atmospheric pollution is causing several environmental problems it is incumbent to reduce the impact of pollution on the environment. One particular problem is the production of CO 2 by many transport and industrial applications. Instead of stocking CO 2 and instead of being a product, it can be used as a source. The case considered is the CO 2 reformation of methane producing hydrogen and CO. It is an endothermic reaction, for which the activition barrier needs to be surpassed. This can be done efficiently by the method of Dielectric Barrier Discharge. The process relies on the collision of electrons, which are accelerated under an electrical field that is created in the discharge area. This leads to the formation of reactive species, which facilitate the abovementioned reaction. This study is performed using a Matlab program with the Reaction Engineering module in COMSOL (with an incorporated kinetic mechanism) in order to model the discharge phase. Then COMSOL (continuity and Navier-Stokes equations) is used to model the flow in the post-discharge phase. The results showed that both a 2D and 3D model can be used to model the chemical-plasma process. These methods need strongly reduced kinetic mechanism, which in some cases can cause loss of precision.

show abstract

“…On the other hand, partially reduced products like CH 3 OH and HCHO [8,9] are desirable for valuable use in various chemical processes. In this respect, while CH 3 OH production has been studied in detail, even in a recent study specific formation of HCHO from CO 2 under DBD has remained mostly speculative [10]. In this study, using various types of hydrocarbon type Hatom sources we have first aimed to probe this missing aspect of the gas-phase chemical reduction process to realize the conditions leading to HCHO production.…”

Section: Introductionmentioning

confidence: 98%

Gas-phase and On-surface Chemical Reduction of CO2 to HCHO and CO under Dielectric Barrier Discharge

Dey

Das

2006

Plasma Chem Plasma Process

View full text Add to dashboard Cite

Selective chemical reduction of CO 2(g) (with carrier Ar) in presence of organic compounds, either mixed in the gas-phase or present as a contact surface, under Dielectric Barrier Discharge is presented in this study. Along with gas-phase CO generation, added hydrocarbons (C n H 2n+x ; n = 6-12; x = 0 or 2) resulted in HCHO production with the maximum H-atom utilization efficiency being~15% of the total present. Product CO and HCHO were estimated separately by pre-concentration in specific absorber solutions followed by their discrete colorimetric measurements. On the other hand, in presence of various types of organic surfaces (e.g. wax, plastics and polymers, also acting simultaneously as a dielectric barrier), it was found that while CO could be estimated as above, in the ensuing chemical conversion, product HCHO was retained on these surfaces. On leaching the HCHO into the absorber solution, its production efficiency was estimated to be~5% of CO 2 .

show abstract

Investigation of mechanistic aspects of the catalytic CO2 reforming of methane in a dielectric-barrier discharge using optical emission spectroscopy and kinetic modeling

Cited by 115 publications

References 18 publications

DBD Plasma Assisted CO2 Decomposition: Influence of Diluent Gases

DBD Plasma Assisted CO2 Decomposition: Influence of Diluent Gases

CO₂valorization by means of Dielectric Barrier Discharge

Gas-phase and On-surface Chemical Reduction of CO2 to HCHO and CO under Dielectric Barrier Discharge

Contact Info

Product

Resources

About

Investigation of mechanistic aspects of the catalytic CO2 reforming of methane in a dielectric-barrier discharge using optical emission spectroscopy and kinetic modeling

Cited by 115 publications

References 18 publications

DBD Plasma Assisted CO2 Decomposition: Influence of Diluent Gases

DBD Plasma Assisted CO2 Decomposition: Influence of Diluent Gases

CO2valorization by means of Dielectric Barrier Discharge

Gas-phase and On-surface Chemical Reduction of CO2 to HCHO and CO under Dielectric Barrier Discharge

Contact Info

Product

Resources

About

CO₂valorization by means of Dielectric Barrier Discharge