| Summary: | A high-surface-area activated carbon material (RG) is used as a platform to create highly concentrated NaOH composites. These materials are tested for the removal of H<sub>2</sub>S under industrially relevant conditions (800 ppm H<sub>2</sub>S in CO<sub>2</sub>-, H<sub>2</sub>O- and O<sub>2</sub>-containing streams). The experimental results show that the breakthrough performance highly depends on the amount of NaOH incorporated and the experimental conditions used (e.g., relative humidity). The most promising material (RG-NaOH-30) reaches a saturation uptake of up to 800 mgH<sub>2</sub>S/g at 25 °C and atmospheric pressure. This value is among the most promising results reported in the literature for H<sub>2</sub>S removal, and it is well above traditional commercial samples. Breakthrough column tests confirm the promoting role of humidity in the reaction mechanism. Analysis of the adsorbents after H<sub>2</sub>S confirms the formation of well-defined sulfur (S<sub>n</sub>) microcrystals as the main reaction product.
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