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of the plasma is to change the gas composition before it reaches the catalyst, either providing chemically active species or pre-converting pollutants to more easily treated substances. [13]. Combined plasma/catalyst reactors have been established for various waste gas treatment systems such as NOx removal, abatement of perfluorocarbons (PFCs), hydrocarbon reformation of methane, and removal of volatile organic compounds (VOCs). Typical catalysts used in these experiments are zeolites and metal oxides such as Al2O3, TiO2, CuO, MgO, and ZnO [11,18,93]. Dielectric barrier discharges (DBDs) have frequently been studied for experimental plasma/catalyst systems where the catalyst can be packed into a cylindrical discharge tube or coated on one or both of the DBD electrodes. One study of NOx removal in a DBD showed that the presence of a catalyst increased conversion efficiency to 65%, compared to just 24% when only the plasma was used [18]. Corona discharges are also commonly used for pollution abatement. In a study done for toluene degradation using a positive corona, 15 g of TiO2 catalyst material were added to the discharge, resulting in an increased toluene removal rate from 27% to 82% [18]. There is a variety of experimental results similar to the examples given above showing the positive effects plasma/catalyst systems can have on gaseous pollution abatement. Though limited, there are also specific studies for plasma CO2 dissociation combined with catalysis. One study has reported the effects of adding of porous γ-Al2O3 packed into a pulsed corona discharge [108]. With the plasma reactor alone, CO2 conversion was only 3%. With the addition of the catalyst, the CO2 conversion increased to 16% under the same operating conditions. A plot of these results is shown in Figure 3.16. This clearly demonstrates the capability of a catalyst to influence the conversion degree of CO2 to CO in plasma systems. With the optimization of the plasma source and the correct catalyst, high energy efficiency could be achieved with a high conversion degree. 63PDF Image | CO2 Conversion in a Microwave Plasma Catalyst System
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