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2.4. DISCUSSION 2. HYDROGEN RADICAL ASSISTED METHANATION Arc source Ar+ H C1 C3 C3 CO + ArH+ H 2 D3 D1 D1 R2 R2 O CO OH Reactor Figure 2.5: Part of the reaction scheme used to explain the product formation. Dashed arrows indicate reactions. H produced in the arc and reactor is connected by a solid line. to H radicals by electron impact dissociation (reaction A1). For detailed description of process occurring in arc when H2 is introduced, the reader is referred to [105]. Although the arc is expected to dissociate H2 into H with very high efficiency (> 80%) most of H atoms recombine at the surface of arc producing rovibrationally excited H2 molecules (reaction A3). The H2 molecules thus released into the plasma jet are ro-vibrationally excited. It has be noted that the ro-vibrationally excited molecules (H2rv) are highly susceptible to dissociation on interaction with electrons at the periphery of arc. On the whole with the kind of arc used in this work, we can expect a net dissociation degree (H2 into H radicals) of around 10% at the beginning of jet [106]. Although H+ ions are produced in the arc, they are atleast one order of magnitude smaller than H radicals and whatever are left recombine with electrons very fast [94]. Hence the role of H+ ions is neglected for the current chemical scheme. When mixtures of Ar and H2 are injected through the arc the composition of produced species is expected to be in the intermediate range of pure Ar and pure H2 cases. 2.4.2 Active species production in the reactor Species produced in the arc flow into the reactor (forming EPJ). Before further analysis two very important types of reactions occurring in the reactor need to be discussed. They 27PDF Image | Understanding CO2 containing non-equilibrium plasmas
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