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Int J Energy Environ Eng (2014) 5:131 Page 7 of 8 131 Fig. 10 Adsorption isotherms of AC zeolite at lower pressures, but at higher pressures (up to 35 bar) the CO2 uptake for AC was higher than that of the zeolites [25]. Conclusions The CO2 adsorption experiments were conducted using gravimetric method at different temperatures and pressures. From this study, it was concluded that the CO2 adsorption isotherm obtained in this study followed general gas adsorption behavior, demonstrating that the CO2 adsorp- tion capacity increases with increasing pressure and decreases with increasing temperature. The adsorption isotherm follows a type-I isotherm classification according to IUPAC, representing a monolayer adsorption mecha- nism. Among the three adsorbents tested, zeolite 13X offers the highest adsorption capacity, and AC provides the lowest capacity at temperatures ranging from 25 to 60 °C and pressures up to 1 bar. The experimental data of CO2 adsorption were fitted with Langmuir and Freunlich iso- therm models. It was found that Langmuir model showed the best fit with the zeolite 13X and zeolite 4A while Freunlich model provided excellent fit with AC. The thermodynamics parameter were calculated from Van’t Hoff‘s equation and concluded that the adsorption experi- ment were exothermic in nature for the three adsorbents. There is no full regeneration for zoelites while a full regeneration can be achieved with AC. Authors’ contributions All authors have been involved in drafting the manuscript and approved the final manuscript. Acknowledgments This study has been funded by the Indian Institute of Technology Guwahati. Conflict of interest The authors declare that there are no conflicts of interests regarding the publication of this article. 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