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"Knowledge of the adsorption behavior especially at high pressure, has been long been important inprocesses involving high pressure gas adsorption such as: gas separation, gas storage, and CO;sequestration. However research on high pressure adsorption is considerably rare, also model that canaccurately represent high pressure gas adsorption. Accurate model which has a strong theoretical basecan improve model ability to predict gas adsorption when experimental data are not available. Therefore,the new model need to be developed to overcome the discrepancies of the existing model. In this study, weevaluate and further develop adsorption models based the Ono-Kondo (OIG theory to improve theirpredictive capabilities when dealing with near-critical and supercritical adsorption systems. The goal ofsuch developments is to facilitate the use of reliable computational frameworks for representingadsorption behavior, as well as improving our understanding of the phenomenon. The abilities of the two-parameter OK models to correlate accurately supercritical adsorption systems are demonstrated byrepresenting the adsorption data with 3. 6% AAD on average. The generalized OK model can also predictthe adsorption on activated carbon with 8% AAD. Furthermore, a high potential exist the model thatprovides reasonably accurate predictions for other gases adsorption isotherms based on adsorption datafor one gas at given temperature."

"Salah satu upaya ECBM adalah dengan menginjeksikan gas nitrogen ke dalam reservoir CBM. Gas nitrogen yang diinjeksikan ke dalam reservoir batubara tersebut teradsorp seiring dengan berkurangnya CH4 di dalam reservoir tersebut. Oleh sebab itu, diperlukan informasi mengenai karakteristik adsorpsi N2 pada batubara Indonesia, mengingat Indonesia memiliki potensi CBM yang cukup besar, yaitu 450 TCF. Dalam penelitian ini, digunakan sampel batubara Barito dan Ombilin sebagai adsorben. Kapasitas adsorpsi N2 pada batubara Indonesia diperoleh dengan adsorpsi tekanan tinggi dengan variasi kandungan air pada temperatur 25°C - 55°C dan tekanan 0 atm - 60 atm. Dari penelitian ini diperoleh bahwa kapasitas adorpsi N2 pada batubara Barito 6,85 % hingga 16,92 % lebih banyak daripada batubara Ombilin. Selain itu, peningkatan temperatur dapat menurunkan kapasitas adsorpsi hingga 8,96 %. Kandungan air pada batubara juga dapat menyebabkan penurunan kapasitas adsorpsi 11,6 % hingga 11,8 %. Data eksperimen yang direpresentasikan dengan model Ono-Kondo menghasilkan deviasi hingga 11,75 % AAD. ......Injecting high pressure nitrogen into CBM reservoir is one of ECBM methods. The nitrogen injected into CBM reservoir will be adsorbed on coal surface, while partial pressure of methane decreases. The consequences, we need information about nitrogen adsorption capacity on Indonesian coal, considering that Indonesia has 450 TCF CBM potential. Barito and Ombilin coal are used as adsorben. Nitrogen adsorption capacity obtained by doing high pressure adsorption using water content variation at temperature 25°C - 55°C and pressure 0 atm ' 60 atm. This experiments results that N2 adsorption capacity on Barito coal is 6,85 % - 16,92 % higher than Ombilin coal. Additionally, increasing temperature cause decreasing N2 adsorption capacity on coal as much as 8,96 %. Water content also decreases adsorption capacity as much as 11,6 % up to 11, 8%. This experiment data correlated using Ono-Kondo model results in deviation up to 11,75 % AAD."