Bibliographic Details
| Title: |
Mn 强化木质素基活性炭低温 SCR 性能的机制. |
| Alternate Title: |
Mechanism of Mn to enhance the low-temperature SCR performance of lignin-based activated carbon. |
| Authors: |
薛晓军1 376981713@qq.com, 罗 琳2, 张慧荣2 zhanghuirong@sxu.edu.cn, 崔静磊2, 王宝凤2 |
| Source: |
Clean Coal Technology. 2025 Supplement, Vol. 31, p214-222. 9p. |
| Subject Terms: |
*Catalytic reduction, *Activated carbon, *Oxidation states, *Catalyst structure, *Catalyst synthesis, *Reaction mechanisms (Chemistry), *Denitrification |
| Abstract (English): |
Nitrogen-doped lignin-based activated carbons with different Mn loadings were prepared by impregnation method, aiming to investigate the mechanism of Mn modification on their physicochemical properties and the performance of low-temperature denitrification by NH3 selective catalytic reduction (NH3–SCR). The structure and performance of the catalysts were comprehensively analyzed by various characterization means. The results showed that Mn modification significantly reduced the specific surface area and pore volume of the activated carbon, and the diffraction peaks of MnS were detected in the 7% Mn/AC and 9% Mn/AC samples at higher Mn loading. Mn was characterized in the form of Mn2+, Mn3+ and Mn4+ forms, and its denitrification efficiency increased with increasing Mn loading, with 5% Mn loading giving the best performance of the catalyst with a denitrification efficiency of 63.4%. It was concluded that Mn3+ is the main active substance in NH3–SCR denitrification process. In addition, the introduction of Mn increased the relative content of Oβ, suggesting that Oβ plays a key role in the catalyst denitrification process. The NH3–SCR reaction follows the E–R mechanism. The study provides an important experimental basis for optimizing the preparation of Mn-modified activated carbon and its application in low-temperature denitrification. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
通过浸渍法制备了不同 Mn 负载量的氮掺杂木质素基活性炭, 旨在探讨 Mn 改性对其物理化 学性质及 NH3 选择性催化还原 (NH3–SCR) 低温脱硝性能的影响机制。通过多种表征手段, 全面分 析了催化剂的结构和性能。结果表明: Mn 改性显著降低了活性炭的比表面积和孔体积, 且在 Mn 负载 量较高时, 7% Mn/AC 和 9% Mn/AC 样品中检测到了 MnS 的衍射峰。Mn 以 Mn2+、Mn3+和 Mn4+形式 存在, 且其脱硝效率随 Mn 负载量增加而有所提升, 5% Mn 负载量的催化剂性能最佳, 脱硝效率达到 63.4%。研究认为 Mn3+是 NH3–SCR 脱硝过程中的主要活性物质。此外, Mn 的引入提高了 Oβ 的相对 含量, 表明 Oβ 在催化剂脱硝过程中起着关键作用。NH3–SCR 反应遵循 E–R 机理。该研究为优化 Mn 改性活性炭的制备及其在低温脱硝中的应用提供了重要的实验依据。 [ABSTRACT FROM AUTHOR] |
| Database: |
Energy & Power Source |
