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Carbon Dioxide Decomposition by Plasma Methods and Application of High Energy and High Density Plasmas dioxide plasma is generated in the capillary tube. Helium gas is used as a carrier gas to stabilize the capillary plasma for a wide range of discharge pressures and discharge currents. The chemical composition of the reaction products and the carbon dioxide conversion rates were studied. From this study one can deduce that the carbon dioxide conversion is predominately by the electron impact carbon dioxide dissociation and gas phase reverse reactions even in a capillary plasma reactor. Decomposition of carbon dioxide to carbon monoxide and oxygen in argon stream under atmospheric pressure has been investigated by Matsumoto et.al10) using a dielectric-barrier discharge plasma reactor (Fig. 6). In Fig. 4 Schematic diagram of experimental apparatus. Fig. 5 Schematic diagram of capillary plasma reactor. Fig. 6 Dielectric barrier discharge reactor. this reactor the inner electrode was supported at the center by a quartz tube fitting. The quartz tube is used as the outer electrode tightly surrounded by a cylindrical jacket made by metallic aluminium. When an a.c. current at a high voltage was supplied into the argon stream, the homogeneous light of a cylindrical discharge was observed between the inner electrode and the quartz wall of the reactor tube. The carbon dioxide dissociation was found to proceed in accordance with the reaction 2 CO2 = 2 CO + O2 at considerable rates, which increased with increasing the input voltage, the carbon dioxide concentration in argon, and the heat of oxide formation of the corresponding metallic component used as the electrode. Decomposition of carbon dioxide by a gliding arc plasma was examined by Indarto el.al.11). The experimental setup consist of a plasma reactor made of a quartz-glass tube with a Teflon seal comprising two triangular electrodes made from stainless steel at upper part is shown in Fig. 7. The gas mixture was introduced between the electrodes through a capillary. A high frequency AC power supply was connected to the gliding arc electrode to generate plasma. The effect of total gas flow rates have been used to study the chemical process reaction in the gliding plasma system. The model of active-chemical kinetic carbon dioxide decomposition was developed to investigate the pathways of plasma reactions. In this study carbon dioxide decomposed to carbon monoxide and oxygen. 4. Decomposition of Carbon Dioxide Using Gas Tunnel Type Plasma Jet In this section we discuss the plasma method which is being used for a number of times for carbon dioxide decomposition. In this method the plasma device used is a gas tunnel type plasma jet torch shown in Fig. 8. In this case carbon dioxide is inserted from the center hole of the cathode nozzle. Two d.c. power supplies were used for the generation of the gas tunnel type plasma jet. Fig. 7 Schematic diagram of experimental setup. 14PDF Image | Carbon Dioxide Decomposition by Plasma Methods
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