CO2 Conversion in a Microwave Plasma Catalyst System

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CO2 Conversion in a Microwave Plasma Catalyst System ( co2-conversion-a-microwave-plasma-catalyst-system )

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􏳥 Analysis of the C2 spectra indicates that the microwave plasma does not produce a complete non-thermal plasma when operating with CO2 as a major gas species. The vibrational and rotational gas temperatures are in thermal equilibrium, leading to low values of energy efficiency. 7.1.3 Plasma/Catalyst System Characterization The plasma/catalyst system was characterized to determine the influence of the monolith structure and the Rh/TiO2 catalyst material on CO2 dissociation. Both the monolith and the catalyst resulted in changes to efficiencies and plasma temperatures. 􏳥 The monolith structure causes a slight efficiency loss for CO2 dissociation 􏳥 The plasma temperatures at the discharge center move closer towards thermal equilibrium with the presence of the monolith downstream 􏳥 The monolith structure impedes exiting gas flow due to a 43% reduction in tube cross-sectional area, most likely resulting in higher pressure upstream of the monolith and leading to lower efficiencies. 􏳥 The monolith structure is not an appropriate design for this experimental system with high gas flow rates at atmospheric pressure. 􏳥 The Rh/TiO2 catalyst coating causes a large drop in dissociation efficiency for this experimental configuration. 􏳥 The catalyst can be plausibly said to enhance the reverse reaction CO + O2 → CO2 + O, resulting in an increased flow of CO2 exiting the discharge tube. 􏳥 The Rh/TiO2 coating is not an appropriate catalyst to facilitate CO2 dissociation under high gas temperature conditions at atmospheric pressure 155

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