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2.4. DISCUSSION 2. HYDROGEN RADICAL ASSISTED METHANATION more likely than that of CO2 and this is more evident in pure hydrogen conditions where methane production is at least one order of magnitude higher in Ar + CO + H2 plasmas than under Ar + CO2 + H2 conditions. The higher methane production in Ar + CO + H2 plasmas further validates the hypothesis of requirement of syngas like mixtures for effi- cient methane production. No oxygenates of carbon e.g. HCHO could be measured in any of the conditions ruling out the possible mechanism of (gas phase) CO2 methanation via formation of oxygenates. CO2 input CO (stainless steel) CO (copper ) CH 4 (stainless steel) CH 4 (copper) -1 10 -2 10 -3 10 -4 10 0.0 0.2 0.4 0.6 0.8 1.0 H /H +Ar 22 Figure 2.4: CH4 and CO distributions as a function of Φ (see equation 2.1) through the arc in Ar + CO + H2 plasmas when reactor walls are covered with different surfaces. When surface material of the reactor is changed to copper (Cu) by covering the re- actor wall with a copper foil, soot formation on the wall is observed. For the native stainless steel surface or Aluminum (Al) foil, of similar thickness as Cu, soot formation was not detected. A shift in the threshold ratio for methane formation to lower values was also observed (see figure 2.4). Though methane was detected at lower additions of H2, the absolute quantities of CH4 and CO production however decreased when Cu foil is present (fig. 4). 2.4 Discussion The major trends observed in the experiments can be understood in terms of a simple chemical scheme presented in following sections and illustrated in figure 2.5; this scheme is based on the fact that the mean electron energy, Te, is different in the arc (plasma 25 Mixing ratioPDF Image | Understanding CO2 containing non-equilibrium plasmas
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