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plasma source used in this dissertation had a cost of 0.02 kW-hr per gram of CO2 dissociated. The plasma system for CO2/H2O must be about an order of magniture more cost efficient to create a positive net product of energy. In addition to producing syngas, CO2 can be combined with hydrogen-containing molecules to create other hydrocarbons. Specifically the conversion of CO2 and CH4 to higher hydrocarbons has been extensively studied in experimental plasma systems [62, 82,93]. Typical products of the plasma conversion include gaseous hydrocarbons like ethylene, acetylene, and propylene as well as some liquid hydrocarbons and oxygenates. The process of CO2 conversion to hydrocarbons has also been studied in photocatalytic reactors [86,105]. In these reactors the energy can be supplied directly from solar panels, a renewable source, and the hydrogen can be produced from solar-powered water electrolysis. However, any dissociation or reforming process will be energy intensive and typical efficiencies for photocatalytic processes are usually less than 1% [86]. 6.5 Summary In summary, the atmospheric pressure microwave plasma source was experimen- tally tested for CO2 dissociation in three different systems: the pure plasma, the plasma/monolith system, and the plasma/catalyst system. Each system produced dif- ferent results, with the biggest change in efficiency occurring between the pure plasma and the plasma/catalyst systems. The computational work provided valuable insight into the mechanisms of CO production and some estimates for plasma properties. Initial experiments performed in the pure plasma system showed the effects of adding CO2 to an Ar discharge and the challenges of operating at atmospheric pressure. The emission spectra dramatically changed, eliminating almost all Ar neutral lines after the addition of CO2. The microwave energy was directed at vibrational excitation of CO2, not ionization, and Ar was used as an electron source. The variation of Ar flow 150PDF Image | CO2 Conversion in a Microwave Plasma Catalyst System
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