Activated Carbons for Syngas Desulfurization: Evaluating Approaches for Enhancing Low-Temperature H2S Oxidation Rate

Its relatively low cost and high surface area makes activated carbon an ideal adsorbent candidate for H2S removal. However, physical adsorption of is not very effective; therefore, methods to facilitate reactive oxidation on carbons are interest. The performance removal non-impregnated, impregnated, doped in low-temperature syngas was evaluated fixed-bed breakthrough tests. importance oxygen content relative humidity established Impregnates especially improved the rate compared non-impregnated carbons. Non-impregnated could however retain a capture capacity with sufficient contact time. In test, best achieved by carbon, 320 mg g−1. Ammonia found significantly improve carbon. A small quantity ammonia consumed bed, suggesting that reactant. Finally, validate ammonia-enhanced desulfurization, bench-scale experiments were performed biomass-based gasification syngas. results show when concentration tens ppm range, 40–160 proceeded rapidly. Ammonia-enhanced allows utilization cheaper situ improvement kinetics. enhancement therefore as viable method achieving high-capacity unmodified