Adsorption equilibrium isotherms and thermodynamic analysis of CH 4 , CO 2 , CO, N 2 and H 2 on NaY Zeolite
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Adsorption equilibrium isotherms and thermodynamic analysis of CH4, CO2, CO, N2 and H2 on NaY Zeolite Li Feng1 · Yuanhui Shen1 · Tongbo Wu1 · Bing Liu1 · Donghui Zhang1,2 · Zhongli Tang1 Received: 29 September 2019 / Revised: 7 January 2020 / Accepted: 24 January 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Adsorption capacities of C H4, CO2, CO, N2 and H 2 on NaY zeolite were measured at 298 K, 318 K, 338 K and 358 K with pressure ranged from 0 to 10 bar. The order of adsorption capacity was C O2 ≫ CH4 > CO > N2 ≫ H2. The experiment data were fitted by the Langmuir, Toth and Sips equations. The fitting relativity of above models were also compared. Moreover, the isosteric heat of adsorption were calculated by the Clausius–Clapeyron equation, the results showed that the adsorption 2 is the smallest. Finally, heat of C O2 is the largest (41.89764 kJ/mol with adsorption loading of 5.8 mmol/g) and that of H the selectivity of binary mixture was predicted according to the IAS theory. Keywords Adsorption · Isotherms · NaY zeolite · ISAT · Selectivity
1 Introduction Global warming, which leads to glacier melting, extreme weather, has become one of the worst global issues nowadays. Caused by greenhouse gas (mainly CO2) emission, more attentions have be paid to C O2 capture (Lopes et al. 2009). H2, widely used in petroleum, metallurgy, medicine, and aerospace, is regarded as a relatively clean secondary energy source to solve the energy crisis and global warming owning to its high calorific value and no greenhouse gases emitting (Wenrong et al. 2018). As we know, hydrogen could be produced by fossil fuels or electrolysis of water. Due to the high cost of electrolyzed water, 90% of hydrogen is obtained through fossil fuels, especially natural gas. First, natural gas is converted to syngas through gasification or Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10450-020-00205-8) contains supplementary material, which is available to authorized users. * Donghui Zhang [email protected] 1
Collaborative Innovation Center of Chemical Science and Engineering, The Research Center of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
The Research Center of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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reforming. After the process, it is followed by a water gas shift (WGS) (Song et al. 2009). Undergoing the above pretreatment, the syngas, comprised of CO2, CO, N2, CH4, and H2, could be used in the following separation. To obtain high-purity hydrogen and capture C O2, various separation processes have been developed. Among the available technologies, adsorption is the dominant separation method because of its simple process and low energy consumption, which has been widely used in the separation and purification of gas mixture. Therefore, it is crucial to get some parameters
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