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4.5. COMPARISON WITH PIN-PIN REACTOR 4. FLUID MODELLING OF CO2 DISSOCIATION dissociation, i.e. net CO production, at the cold conditions used in a typical DBD in pure CO2, is due to the fact that the CO produced is very stable and cannot be easily oxid- ized or reduced so that loss processes of CO are slow. For example,one of the expected loss reaction, the recombination of CO and O back to CO2 is spin forbidden [203] and hence, proceeds only very slowly in the gas phase or on non-catalytic surfaces like quartz. Another loss process, ionzation of CO is also not expected to occur at low conversion de- grees [62]. As an extension, it can be expected that a description of an electron induced produc- tion process in terms of the specific energy input is fairly general independent of the gas mixture. That is, if the fractional power transferred is the determining variable, as op- posed to other probable means such as chemical reactions like ionization of meta-stables then, the density of a chemical species produced by an electron impact collision pro- cess with ground state molecules should scale only with the specific energy input in a filamentary dielectric barrier discharge. The reason why universal scaling relations are not widely observed in other electron induced plasma processes, for example, in optical emission intensity from electronically excited species depending also on the fractional power transferred but cannot be easily described with one single scaling parameter, is that they have different fast loss rates (collisional quenching) which vary widely depending on pressure and temperature. One example is the ozone generation in dielectric barrier discharges [30, 204]. But the ozone yield scales with the specific energy input only over a limited parameter range because of the thermal destruction of ozone at elevated temperatures [30]. 4.5 Comparison with pin-pin reactor In this chapter, the results from the model were mainly compared with that experimental results obtained from a planar geometrically symmetric DBD. In principle the results could also be compared with that of the experimental results from the pin-pin reactor. In the previous chapter it was shown, by an approximation, that conversion from one fila- ment is approximately in the same order as that the model predicts. But, to extend further, the calculations should be performed for the corresponding frequencies (22 kHz) in the future. Nevertheless, from the first glance when the conversion from the experimental values are adjusted according to equation 4.23, they fall approximately in the same trend line as shown in the figure 4.9. The main advantage of the pin-pin reactor has been to show that the trends in conver- sion can be extended to individual filaments. However, this advantage could not be used 103PDF Image | Understanding CO2 containing non-equilibrium plasmas
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