Abstract
Current advancements in flue gas desulfurization have highlighted the efficacy of activated coke (AC) as an SO2 adsorbent, leveraging sulfur resources. Despite its success, challenges such as lengthy processing and logistics for sulfuric acid storage and transport limit its widespread use. This research explores an innovative approach: powder saturated AC (SAC) achieves rapid temperature rise and one-step regeneration coupled reduction in a drop-tube reactor. Findings reveal that SAC undergoes primary regeneration at 450–650 ℃, converting adsorbed sulfur compounds into gaseous SO2. However, issues like incomplete active site recovery and surface oxidation reduce the re-adsorption capacity of regenerated AC. At 750–950 ℃, a concurrent regeneration and reduction phase converts desorbed SO2 into elemental sulfur. Carbothermal reduction during this phase enhances microporous structure development, lowers oxygen content, increases edge defects, promotes sulfur doping, and boosts SO2 re-adsorption efficiency. This study provides practical insights and a conceptual framework to refine desulfurization processes and optimize resultant products.
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