| Summary: | 碩士 === 國立中央大學 === 環境工程研究所 === 87 === Control of CO2 emissions has become a global concern. The enhanced greenhouse effect due to increased CO2 emission from man-made sources is expected to have profound effects on the global climate. Recent research directions have focused on high efficiency and low costs methods. Effective reforming of CO2 with H2 as additive via dielectric barrier discharge was experimentally investigated in this study. A laboratory-scale experimental system was designed and constructed to evaluate the reforming efficiency of CO2. In addition to packing with Al2O3, combined plasma catalysis (CPC) was also used in the experiment to generate methanol. The effect of operational parameters including applied voltage, gas temperature, additive concentration (including H2, O2 and H2O), pressure, gas residence time, and power input on the removal efficiency of CO2 was investigated. Generally, when Al2O3 pellets were packed in the discharge gap, experimental results indicated that the removal efficiency of CO2 increased with applied voltage, H2 concentration, gas temperature, gas residence time and power input, and decreased as oxygen, H2O content and pressure increased. The major product of the CO2 processing was carbon monoxide in the discharge process. On the other hand, when catalysts were packed in the discharge gap, experimental results indicated that the removal efficiency of CO2 increased with applied voltage, H2 concentration, gas temperature, gas residence time and power input, and decreased with increasing oxygen, H2O content and pressure. The major products include CO and CH3OH. However the selectivity of methanol increased with pressure and decreased with temperature. Experimental results indicated that DBD with catalyst assistance can shift down the temperature when methanol were produced, and proved that reforming of CO2 with H2 as additive via dielectric barrier discharge was feasible.
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