Abstract
Thin, binder-less zeolite NaX laminates, with thicknesses ranging between 310 to 750 μm and widths exceeding 50 mm and biaxial tensile strength in excess of 3 MPa, were produced by pulsed current processing. The NaX laminates displayed a high CO2 adsorption capacity and high binary CO2-over-N2 and CO2-over-CH4 selectivity, suitable for CO2 capture from flue gas and upgrading of raw biogas. The thin laminates displayed a rapid CO2 uptake; NaX laminates with a thickness of 310 μm were saturated to 40% of their CO2 capacity within 24 seconds. The structured laminates of 310 μm thickness and 50 mm thickness would offer low pressure drop and efficient carbon capture performance in a laminate-based swing adsorption technology.
Highlights
Thin, binder-less zeolite NaX laminates, with thicknesses ranging between 310 to 750 μm and widths exceeding 50 mm and biaxial tensile strength in excess of 3 MPa, were produced by pulsed current processing
Zeolite NaX laminates of thicknesses between 310 to 750 μm were produced by pulsed current processing (PCP)
Thin laminates were obtained by spreading a specific amount of NaX powder homogeneously onto a graphite paper that was placed into the PCP mold
Summary
Binder-less zeolite NaX laminates, with thicknesses ranging between 310 to 750 μm and widths exceeding 50 mm and biaxial tensile strength in excess of 3 MPa, were produced by pulsed current processing. The development of new processes to produce self-standing laminated adsorbents with close dimensional tolerances and high mechanical stability without support material or addition of binders is of pivotal importance for cost- and volume-efficient gas separation processes with large flows, especially CO2 capture from power-plant flue-gas and biogas upgrading. We demonstrate that mechanically stable and thin self-standing laminates of NaX zeolite can be produced by a tailored pulsed current processing (PCP) method from NaX zeolite powder without addition of binders.
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