As a multipurpose energy carrier, synthetic natural gas (SNG)
attracts increasing attention thanks to its potential as simple technique
for CO removal, the continuous rising of natural gas prices,
increasing concern on depletion of natural gas, and greenhouse
effect of the released CO and CO2. Methanation of syngas,
as the key process of SNG processes, is a highly exothermic reaction
accompanied by a large decrease in mole number was indicated
as Eq. (1)