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2. HYDROGEN RADICAL ASSISTED METHANATION 2.4. DISCUSSION Ar+ H CO 2 CO 0.20 0.16 0.12 0.08 0.04 0.00 0.0 0.2 0.4 0.6 0.8 1.0 Figure 2.7: Calculated mixing ratios of Ar+ and H as a function of Φ (see equation 2.1) through the arc in Ar + CO + H2 The O radical that is produced in DR of CO+2 (reaction D1) diffuses and is adsorbed on the walls. Others [36] have considered O radical reduction of CO2 (reaction R3) important in CO2 conversion in plasma environment CO2 +O−→CO+O2 (R3) However, the rate coefficient of this reaction is too small at the gas temperatures expected in the reactor. Also, the ratio of O2 to CO densities is significantly different from what can be expected if this reaction is important, hence it is neglected for the current analysis. Carbon production is typically not seen in Ar + CO2 + H2 plasmas (except when the surface is covered with copper, which will be discussed in section 2.4.3). This is due to the fact that rate coefficient for CT of CO ( reaction C2) and concentrations of electrons available for DR of CO(reaction D2) are each much smaller than for the corresponding sequence with CO2. Atomic oxygen released by dissociation of CO2 (or CO) quickly ox- idizes the carbon, produced from CT and DR of CO back (reaction S6), further reducing the effect of net CO dissociation. The constant amount of water produced for H2 rich conditions (Φ > 0.5) in Ar + CO2 + H2 plasmas, even when there is no Ar injected in the arc, is because of slow reduction of CO2 to produce OH (reaction R2). The OH radical diffuses to the surface where it is converted to water (reaction S6). Similar reaction to reduce CO by H radical to OH in gas phase is not possible; the higher amounts of water in Ar + CO2 + H2 plasmas 30 Mixing ratioPDF Image | Understanding CO2 containing non-equilibrium plasmas
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