Table 4 summarizes the purity of the recovered CO2/CH4 gas for these two heating techniques over five cycles of adsorption/desorption. Based on GC–TCD analysis, the purity of the gas desorbed by microwave heating consisted of 82–83% CO2 and 17–18% CH4 while the purity of the gas desorbed by conductive heating contained 81–81.8% CO2 and 18–19% CH4.