CO separation from complex streams enabled by dual-functional materials
Donato Pinto (TU Delft - Applied Sciences)
José Palomo (TU Delft - Applied Sciences)
Atsushi Urakawa (TU Delft - Applied Sciences)
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Abstract
We report a CO separation technology enabled by a dual-functional material (Cu-K/γ-Al2O3) under isothermal and isobaric conditions. The CO adsorption-desorption cycles were demonstrated in a fixed-bed reactor between 300 - 450 °C with the achievement of a full CO capture scenario (complete CO uptake until breakthrough). Sorbent regeneration with H2 directly upgraded the captured CO into syngas (H2 + CO). Mechanistic insights obtained from in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) revealed that CO capture proceeds via interaction with surface hydroxyl intermediates, forming potassium carbonate species. Regeneration occurs through H2 activation on the Cu sites and subsequent carbonate decomposition. The capability of handling humid and O2-containing streams during CO capture was verified. As an alternative to H2, water vapor can trigger sorbent regeneration after CO capture with release of gaseous CO2, highlighting the additional system potentiality of full CO capture and conversion through a sorption mediated water-gas shift (WGS)-like process.
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