Figure 23 shows the amount of CH4 and CO2 that has adsorbed to increase pressure to system at various values until maximum. After that reduces the pressure equal to the time you increase the pressure. Until, the last is equal to the start value as show in the graph. This graph shows the adsorption isotherm of a CH4/CO2 mixture at 300 K 2000cycle 100,000 Pa in the Slit pore by concentration ratio of CH4 to CO2 are 50:50 %. The adsorption isotherm is obtained by measuring the uptake (the adsorbed amount) as a function of pressure at a given temperature. Which we determine pore density at Y axis and X axis as pressure. From Figure you will see that if we increase the pressure to the system. It will make the system adsorb more CH4 and CO2 too. Adsorption isotherm can be demonstrated with the increase of pressure from the emptied pore (adsorption) or with the decrease of pressure from the filled pore (desorption). The hysteresis loop between the adsorption and desorption. Due to our research we’ve studied in the mesopore (2-50nm) scale , so it make hysteresis loop happen. From the picture hysteresis loop similar to the classification of hysteresis loop by IUPAC type 3 (H3) because we’re studying about slit-shaped pores . That’s why hysteresis loop looks like the picture , but the pressure that we give still low. It cause our hysteresis loop not too large and from the Graph1 and Grpah2 have the same cycle equal to 2000 cycle , but we have increased the pressure. The results are not different or very similar. Maybe , it because the pressure we use not high enough to make 2000 cycles loop.