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CO and oxygen, a measure of how well a species will adsorb on a surface as a function of coverage, have been reported as high on Rh surfaces. The same report shows that when Rh is pretreated with oxygen and exposed to CO, CO2 is created [6]. The CO2 creation rate also increases with temperature [35]. This CO oxidation reaction has been extensively studied with just a few examples listed here [14,45,98], and it may be difficult to find an appropriate catalyst to activate the endothermic CO2 dissociation reaction preferred. Perhaps if different catalysts were tested or if the catalyst were placed directly in plasma using other configurations like a packed bed reactor, the efficiencies would increase for CO2 dissociation 6.4.2 Computational Results The discrepancy between computational and experimental results shown in Fig- ures 6.21 and 6.22 indicates that the current model is leaving out other methods of CO production. As demonstrated by the results of the plasma/catalyst system, surface re- actions play an important role in gas phase chemical reactions at atmospheric pressure with a high collision frequency and a small discharge volume. Just as catalyst surface reactions can influence the population of CO2, it is likely that surface reactions are also influencing the production of CO through other reaction chemistry occurring in the experimental system. GlobalKin has a separate surface kinetics module specifically used to model the reactions occurring on a surface, though this surface module was not employed for the computational work presented here. However, there are other ways to simulate changes in gas composition due to reactions with the surface. Each species to be modeled has a user-defined sticking coefficient. First the user can define the fraction of species A to interact with, or be “consumed” by the surface. Then the user defines the fraction of “consumed” species A that will return to the plasma, also called the return branching ratio. Some of A may stick to the wall, indicating a non-zero sticking coefficient; some may return to the plasma; and some may return as 143PDF Image | CO2 Conversion in a Microwave Plasma Catalyst System
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