Selective catalytic reduction of ammonia is the most widely used technology for NO_x removal, but there have been serious ammonia leaks and a narrow reaction temperature window. To overcome these limitations, a coal-based activated carbon (CAC) approach using KOH activation for the ammonia-free reduction of NO was investigated in this work. A preparation process was investigated by evaluating the De-NO_x performance at different mass ratios (KOH:coal = 0–3:1), and activation temperatures (700–900 °C). The optimum conditions were an activation temperature of 700 °C and a 1:1 ratio of KOH/coal, named CAC-1:1-700. Between 330 and 500 °C, the NO conversion efficiency is maintained at 100% within 90 min. The CAC-1:1-700 showed excellent denitrification performance and SO₂ resistance. Based on BET, SEM, XRD, Raman, FT-IR, and XPS characterization analysis, it was found showed that KOH activation could increase the amorphous carbon, pore structure, and C(O) functional groups in CAC, which had positive effects on the denitrification performance. Furthermore, the evolution of char structures and surface species before and after the Char-NO-O₂ reaction was evaluated by Raman and XPS, and the possible reaction mechanisms was proposed. Aliphatic structures and small aromatic rings can play the same role in De-NO_x, O₂ is adsorbed on the carbon to form an oxygen-containing functional group, generating more C–O groups and creating reactive sites C*. NO then interacts with these reactive sites and is reduced to N₂. This research prepared CAC as a promising potential alternative to ammonia reductants due to its excellent denitration performance over a medium temperature range and complex flue gas environments, while providing the high-value utilization of coal resources.

氨选择性催化还原是应用最广泛的NO _x去除技术，但存在严重的氨泄漏和狭窄的反应温度窗口。为了克服这些限制，本工作研究了一种使用 KOH 活化来无氨还原 NO 的煤基活性炭 (CAC) 方法。通过评估不同质量比（KOH:煤 = 0–3:1）和活化温度（700–900 °C）下的脱_硝性能来研究制备过程。最佳条件为活化温度700℃、KOH/煤比例1:1，命名为CAC-1:1-700。在330至500℃之间，NO转化效率在90分钟内保持在100%。 CAC-1:1-700表现出优异的反硝化性能和抗SO ₂性能。基于BET、SEM、XRD、Raman、FT-IR和XPS表征分析发现，KOH活化可以增加CAC中的无定形碳、孔结构和C(O)官能团，这对CAC具有积极作用。反硝化性能。此外，通过拉曼和XPS评估了Char-NO-O ₂反应前后炭结构和表面物种的演变，并提出了可能的反应机制。脂肪族结构和小芳香环在De-NO _x中可以起到相同的作用，O ₂吸附在碳上形成含氧官能团，生成更多的C–O基团并产生反应位点C*。然后NO 与这些反应位点相互作用并被还原为N ₂ 。 该研究使CAC在中温范围和复杂烟气环境下具有优异的脱硝性能，成为氨还原剂的一种有前景的潜在替代品，同时提供煤炭资源的高价值利用。