3 years ago

Ternary Adsorption of Methane, Water, and Carbon Dioxide in Zeolite Na-ZSM-5 Studied Using in Situ ATR-FTIR Spectroscopy

Ternary Adsorption of Methane, Water, and Carbon Dioxide in Zeolite Na-ZSM-5 Studied Using in Situ ATR-FTIR Spectroscopy
Jonas Hedlund, Amirfarrokh Farzaneh, Allan Holmgren, Mattias Grahn, Lindsay Ohlin
The main component in biogas and natural gas is methane, but these gases also contain water and carbon dioxide that often have to be removed in order to increase the calorific value of the gas. Membrane and adsorbent-based technologies using zeolites are interesting alternatives for efficient separation of these components. To develop efficient processes, it is essential to know the adsorption properties of the zeolite. In the present work, adsorption of methane, carbon dioxide, and water from ternary mixtures in high silica zeolite Na-ZSM-5 was studied using in situ ATR (attenuated total reflection)–FTIR (Fourier transform infrared) spectroscopy. Adsorbed concentrations were extracted from the infrared spectra, and the obtained loadings were compared to values predicted by the ideal adsorbed solution theory (IAST). The IAST could not fully capture the adsorption behavior of this ternary mixture, indicating that the adsorbed phase is not behaving as an ideal mixture. The CO2/CH4 adsorption selectivities determined for the ternary mixtures were compared to selectivities determined for binary mixtures in our previous work, indicating that the presence of water slightly improves the CO2/CH4 adsorption selectivity at lower temperatures. Further, the results show that water and carbon dioxide are adsorbed preferentially over methane in high silica zeolite Na-ZSM-5.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b04405

DOI: 10.1021/acs.jpcc.7b04405

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