The influence of power and frequency on the filamentary behavior of a flowing DBD—application to the splitting of CO₂

Abstract

In this experimental study, a flowing dielectric barrier discharge operating at atmospheric pressure is used for the splitting of CO2 into O2 and CO. The influence of the applied frequency and plasma power on the microdischarge properties is investigated to understand their role on the CO2 conversion. Electrical measurements are carried out to explain the conversion trends and to characterize the microdischarges through their number, their lifetime, their intensity and the induced electrical charge. Their influence on the gas and electrode temperatures is also evidenced through optical emission spectroscopy and infrared imaging. It is shown that, in our configuration, the conversion depends mostly on the charge delivered in the plasma and not on the effective plasma voltage when the applied power is modified. Similarly, at constant total current, a better conversion is observed at low frequencies, where a less filamentary discharge regime with a higher effective plasma voltage than that at a higher frequency is obtained.

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

“…Nevertheless, by using the gas flow rate, the time evolution could be translated into a spatial evolution (i.e., as a function of position in the DBD reactor). This spatial evolution was necessary to mimic the typical filamentary behavior found in DBDs used for CO 2 conversion . On their way throughout the reactor, the gas molecules will pass through several microdischarge filaments.…”

“…This spatial evolution was necessary to mimic the typical filamentary behavior found in DBDs used for CO 2 conversion. [87] On their way throughout the reactor,t he gas molecules will pass through several microdischarge filaments. This was mimicked in the model by applying al arge number of consecutive triangular microdischarge pulses in the same way as that described in our previous work.…”

Dry Reforming of Methane in DBD Plasma over Ni‐Based Catalysts: Influence of Process Conditions and Support on Performance and Durability

“…The CH 4 and CO 2 conversions over all the catalysts increased with an increase in the specific input energy (SIE), as shown in Figure . This increase is due to the increase in the current density and the number of microdischarges, which leads to the formation of more number of active species by enhancing the number of collisions . The electron‐impact dissociation initiates the activation of CH 4 and CO 2 and the formation of active species such as CH 3 , CH 2 , and CH species and CO and O, respectively [Equation , , , and ].…”

DBD in burst mode: solution for more efficient CO2conversion?

“…Therefore in the last paragraph, we will also compare the electrical characteristics in burst mode and pure AC mode, at the same delivered power during TON. Correlation between microdischarge parameters and energy efficiency of burst and pure AC mode Figure 10 depicts the number of microdischarges, their mean lifetime and the plasma charge and current for the pure AC (values adopted from our previous paper [61]) and burst mode, as a function of plasma power. Several observations are noteworthy:…”