Reforming is a process of converting natural gas (NG) to syngas (H2 and CO). The relevant approaches range from partial oxidation reforming, autothermal reforming, steam reforming to dry reforming. The main difference among them is the oxidants. The former two approaches require O2 as the oxide agents, while the latter two technologies employ steam and CO2. The most mature technology is steam reforming, which has been commercialized for H2 production for decades. However, none of the individual reforming technology can provide the desired syngas ratio for FT synthesis. Thus, separation technology is required to remove the excessive component.