“…It showed that feeding fuel via an intake swirl significantly facilitated the conversion efficiency of methane, and elevated the concentration of hydrogen. Both higher arc frequencies and longer retention time improving hydrogen concentration were also confirmed (Horng et al, 2007). The plasma converter on hydrogen production via methane reforming and the carbon deposit growth on the electrode surface were explored, and the microstructure of carbon was analyzed with scanning electron microscopy (SEM) and micro-Raman spectroscopy (Horng et al, 2006a).…”