The presence of H₂S limits the use of biogas. Activated carbons (ACs) provide economic and environmental advantages with a high removal efficiency for biogas purification compared to other H₂S adsorbents. In this study, ACs were prepared by steam and an increased flow of CO₂ activation from dairy cattle manure at 850 ℃ and applied to remove H₂S at room temperature. The H₂S breakthrough capacities were evaluated using a lab-designed test. The compositional and textural properties of ACs were characterized by nitrogen adsorption, FTIR, TGA-MS, SEM and X-ray photoelectron spectroscopy (XPS) techniques before and after H₂S adsorption. The 2D-NLDFT model was applied for pore size distribution. Additionally, the manufacturing cost of the best AC was estimated. The results showed that all ACs are microporous carbons with pore widths of 0.67~0.690.67–0.69 nm. The ACs prepared by CO₂ activations exhibit better H₂S removal performance than those activated with steam. AC4 activated by CO₂ with a flow of 1000 ml/m has the largest BET surface area of 408.36 m²/g and the highest H₂S breakthrough capacity of 868.45 mg/g. The micropore volume and basic surface pH play a crucial role in H₂S removal, and the self-catalytic role of intrinsic sulfur on AC4 may also contribute to the oxidation of H₂S. The characterization results indicate that the H₂S is oxidized to elemental sulfur, sulfates/sulfuric acid and sulfites/sulfonic acids in the presence of O₂ during the adsorption process. Due to the higher efficiency in removing H₂S and a total feasible manufacturing cost of $1.05 per kg, AC4 can be considered a cost-effective and promising alternative for biogas desulfurization.

H ₂ S 的存在限制了沼气的使用。_{与其他 H 2} S 吸附剂相比，活性炭 (AC) 具有经济和环境优势，具有较高的沼气净化去除效率。在这项研究中，ACs 是通过蒸汽和增加流量的 CO ₂活化从奶牛粪便中在 850 ℃制备的，并在室温下用于去除 H _{2 S。}使用实验室设计的测试评估H ₂ S 突破能力。_{在 H 2}前后通过氮吸附、FTIR、TGA-MS、SEM 和 X 射线光电子能谱 (XPS) 技术对活性炭的组成和结构特性进行了表征S 吸附。2D-NLDFT 模型用于孔径分布。此外，估计了最佳空调的制造成本。结果表明，所有的活性炭都是微孔碳，孔径为0.67~0.690.67~0.69 nm。通过CO ₂活化制备的活性炭表现出比用蒸汽活化的活性炭更好的H _{2 S 去除性能。}流量为1000 ml/m的CO ₂活化的AC4具有最大的BET表面积为408.36 m ² /g，最高的H ₂ S穿透能力为868.45 mg/g。_{微孔体积和碱性表面pH对H 2} S的去除起着至关重要的作用，而本征硫对AC4的自催化作用也可能有助于H _{2的氧化。}S.表征结果表明，在吸附过程中，在O _{2存在下，H 2} S 被氧化为元素硫、硫酸盐/硫酸和亚硫酸盐/磺酸。由于去除 H ₂ S 的效率更高且总可行制造成本为每公斤 1.05 美元，因此 AC4 可以被认为是一种具有成本效益且有前景的沼气脱硫替代方案。