Decarbonisation Technology May 2026 Issue

This finding opens the question of whether comparing storage materials based on their total saturation storage capacity uses the appropriate figure of merit to optimise the overall process.

surface area as well as pore volume, which strongly decreased with increasing PEI loading (see Figure 5 ). The effect was more pronounced when shaped particles were modified with PEI, while the impregnation route via powder impregnation tolerated higher polymer content in the sample. Figure 4 shows the total number of amine groups increases with PEI content, but the fraction involved in CO 2 capture decreases. As a consequence, each alumina support shows an individual optimum in PEI loading for the total storage capacity. The N 2 adsorption results in Figure 5 clearly show a correlation with PEI

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Andreas Sundermann andreas.sundermann@hte-company.de Charlotte Langheck charlotte.langheck@hte-company.de Robert Baumgarten robert.baumgarten@hte-company.de

content, which causes a loss of accessible surface area as well as pores. Quite surprisingly, impregnated beads and impregnated powders have opposite rankings for surface area and porosity. Based on the nitrogen adsorption results, the critical factor for the decline in CO 2 adsorption is porosity, which is higher for the powder sample at a given PEI loading, while the surface area is lower than for the impregnated beads. Still, the powder sample showed significantly higher CO 2 capture. Conclusion The study showed that fully automated screening of DAC samples can be achieved in a setup equipped with a sample exchanger. To utilise the acceleration potential, a time-optimised test protocol is needed. Fixated polymeric amine materials with high polymer content in particular show comparatively slow storage kinetics, which limit the productivity (i.e. space- time yield) of a DAC reactor.

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