Utilization of Interaction with Dielectric Barrier Discharge Plasma and Impregnated Surface Nano-Particles for Plasma Applications.

This paper describes utilization of dielectric barrier discharge (DBD) plasma interaction with impregnated surface nano-particles for plasma applications. The plasma generation characteristics on DBD plasma actuator and packed-bed reactor are investigated with unexpected objects as impregnated catalysts. The streamer generation of DBD plasma is influenced by different surface nano-particles of the impregnated catalyst between the discharge gaps. The practical use of DBD plasma-catalyst interaction is discussed.

Study on Surface Damage and Performance Degradation of Impregnated Catalyst in Dielectric Barrier Discharge Plasma-Assisted Methane Conversion Processes.

This paper describes the performance degradation of impregnated catalyst in the dielectric barrier discharge (DBD) plasma-assisted methane conversion process. Mn and Ni mixed copper-zinc catalysts, and bare γ-Al2O3 support were exposed to the DBD plasma generated at 1 kHz and 9 kV under CH4 direct conversion for 4 hours. The performance degradation due to the surface damage of the catalyst by the plasma was investigated by SEM analysis.

Modification of Catalyst Surface from Interaction Between Catalysts and Dielectric Barrier Discharge Plasma.

This paper describes modification of catalyst surface from interaction between catalysts and dielectric barrier discharge (DBD) plasma. Ru/γ­Al2O3 catalyst was exposed to DBD plasma for CO2 methanation and CH4 direct conversion reactions. Parameters related to the modification of catalyst surface were investigated by SEM and EDS analysis.

Effect of Electric Discharge on Properties of Nano-Particulate Catalyst for Plasma-Catalysis.

Heterogeneous catalytic processes have been used to produce hydrogen from hydrocarbons. However, high reforming temperature caused serious catalyst deteriorations and low energy efficiency. Recently, a plasma-catalyst hybrid process was used to reduce the reforming temperature and to improve the stability and durability of reforming catalysts. Effect of electric discharges on properties of nanoparticulate catalysts for plasma-catalysis was investigated in the present study. Catalyst-bed porosity was varied by packing catalyst beads with the different size in a reactor. Discharge power and onset voltage of the plasma were measured as the catalyst-bed porosity was varied. The effect of discharge voltage, frequency and voltage waveforms such as the sine, pulse and square was investigated. We found that the optimal porosity of the catalyst-bed exists to maximize the electric discharge. At a low porosity, the electric discharge was unstable to be sustained because the space between catalysts got narrow nearly close to the sheath region. On the other hand, at a high porosity, the electric discharge became weak because the plasma was not sufficient to interact with the surface of catalysts. The discharge power increased as the discharge voltage and frequency increased. The square waveform was more efficient than the sine and pulse one. At a high porosity, however, the effect of the voltage waveform was not considerable because the space between catalysts was too large for plasma to interact with the surface of catalysts.