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Appendix 1.A Cost analysis of CO production Since producing CO from CO2 using non-thermal plasma route is the main topic of this thesis, it is only logical to estimate what efficiencies and throughputs should this route achieve in order to be considered successful. Since a complete economic feasibility study is beyond the scope of this thesis only an order of magnitude analysis is presented. Such an analysis can also be a guideline for any other new method being explored for CCU starting with CO2 dissociation. To this end, first an estimate for the cost of producing CO with existing industry standard is made. Then using present electricity prices, an estimate of how much energy efficiency should the new route achieve so as to be cost competitive with conventional routes is calculated. The major industrial usage of CO is in the form of syn-gas (CO + H2) hence the cost of syn-gas can be taken as a proxy for the cost of CO. On an industrial scale, syn-gas is produced by steam methane reforming of natural gas (see equation A1) and the ideal ratio between H2 and CO should be approximately 2 [68, 69]. CH4 +H2O−→CO+3H2 (A1) For a perfect analysis the cost of syn-gas production, separation of CO and H2 costs and then subsequent reverse water gas shift reaction (RWGS, see equation A2) needs to be included. CO2 + H2 −→ CO + H2O (A2) However in industry RWGS is only used to adjust CO ratio and hence its costs are difficult to evaluate [70] independently. Therefore the cost presented here will be a lower limit for the cost of CO, since it does not include all the factors. 11PDF Image | Understanding CO2 containing non-equilibrium plasmas
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