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The combined dry and steam reforming of methane at atmospheric pressure was experimentally studied by using microwave plasma technology. The effect of the process parameters such as total feed gas flow rate, steam concentration and input microwave power on the synthesis gas H 2 /CO ratio was investigated using a commercial microwave reactor system. In order to minimise the carbon formation and plasma instability, the concentration of methane and carbon dioxide in nitrogen plasma were kept at a low level in this study. The long-term test results show that at the flow rate of 0.2 L min −1 , 0.4 L min −1  and 1.5 L min −1  for CH 4 , CO 2  and N 2  respectively, the carbon formation was not detectable at the input power of 700 W. This reaction condition offers an opportunity to study the effect of adding water to the feed on the syngas ratio H 2 /CO. The test results show that a higher CH 4  conversion (82.74%), H 2  selectivity (98.79%) and yield (81.73%) were achieved compared with those of the dry reforming at the same operating conditions. With the steam addition, the desired H 2 /CO ratio for the Fischer-Tropsch synthesis process can be reached.

Syngas formation by dry and steam reforming of methane using microwave plasma technology