the particle surfaces. While packing the particles into the reactorslowly from the bottom to the top, we shook the reactor tube tomake sure that the distances between particles become as smallas possible. A cylinder-wire-type reactor was used to generatethe DBD. A copper rod of diameter 5 mm was kept at the cen-ter of cylindrical Pyrex glass tube as a power electrode and theoutside wall of reactor was wrapped with stainless steel mesh asa ground electrode. The inner and outer diameters of cylindricalPyrex glass tube were 35 mm and 37 mm, respectively. The lengthof stainless steel 300 mesh was 350 mm and the discharge gapof reactor was 15 mm. A high voltage was applied to the powerelectrode to generate the DBD and we used the oscilloscope equip-ment with the current and voltage probes to measure the dischargepower. All the gas flow rates were controlled by mass flow con-trollers (MFCs). The CO2and CH4gas streams were mixed wellbefore passing through the reactor. All experiments in CO2reform-ing of CH4to syngas by the DBD process were carried out at 1 atmand 25◦C. Because of the heat input to the DBD reactor caused bythe electrical energy dissipation via collisions between particles,we could observe the temperature increases in outlet gas streamand DBD reactor wall by 10◦C and 20◦C, respectively, in steadystate.