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1.3. THESIS OUTLINE 1. GENERAL INTRODUCTION . ⋆ To understand comparative merits of Approaches I and II in a plasma en- vironment, that is, to understand which is more efficient and why? ⋆ To understand the mechanisms that promote or restrict CO2 conversion to CO in a non-equilibrium plasma environment, with dielectric barrier discharge as an exemplary plasma source. In the course of this project many other questions that are specific to the plasma sources used have also been answered. For example, the role of surface charges in re- stricting the development of new filaments in a dielectric barrier discharge is explored in the chapter 3. Hereunder an outline for the thesis is presented. 1.3 Thesis outline Approach I: In chapter 2, results from exploring the first approach are described. Plasma expansions, from a thermal arc, of Ar + H2 gas mixtures are used to convert CO2 into CH4; thermal arc is chosen because of its abil- ity to produce huge fluxes of activated species like ions and radicals and to exploit the group’s (PMP) expertise in studying them over past few decades. Although CO2 conversion to CH4 was shown possible, never- theless it is found that under similar conditions, converting CO to CH4 is much more efficient than converting CO2; the excess O atom available from CO2, as compared with CO, has been shown to scavenge H con- taining species to produce water. From this work it became apparent that Approach Two is more viable than Approach One for CO2 utilization in a plasma environment. For the Approach two in this thesis, a DBD is selected as a plasma source for converting CO2 to CO. From research done in parallel to this project, Brehmer et al [67] using a variety of diagnostics established two important features of CO2 conversion in a symmetric DBD. They are, ⋆ CO2 conversion to CO follows a power-law relation with specific energy input (a measure of energy density put in the reactor). ⋆ Specific energy input acts as a strong scaling parameter that de- termines CO2 conversion to CO; that is, irrespective of pressure, Approach II: 7PDF Image | Understanding CO2 containing non-equilibrium plasmas
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