CO2 separation from wet and dry synthetic biogas has been investigated using adsorption on 4A and 13X molecular sieves in dynamic conditions, flowing through fixed beds in an adsorption column connected with an IR detector. The adsorption of CO2 has also been investigated by IR spectroscopy over pressed disks of the zeolites in static dry and wet conditions. 13X molecular sieve has significant adsorption capacity of CO2 from dry biogas, which is further increased by the presence of moisture. This is due to the change of the adsorption mode of CO2 due to the copresence of water. Over wet 13X.
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