The Development of innovative treatment technology for HCN at low temperatures is vital for the control of HCN pollution. Here, a copper manganese oxide (Cu-Mn-O) catalyst was prepared for the decomposition of HCN at temperatures from 80 to 200 °C. The results showed that the Cu-Mn-O catalyst exhibited excellent catalytic performance for HCN conversion. X-ray photoelectron spectroscopy analysis revealed that Mn³⁺ manifested highly catalytic activity and was largely responsible for HCN decomposition. The N-contained products of HCN contained NH₃, NO/NO₂, N₂O, and N₂, thereby suggesting the concurrent catalytic oxidation and hydrolysis during HCN decomposition on the catalyst. The catalytic oxidation mechanism characterized by in situ diffuse reflectance infrared Fourier transform manifested that four N-contained intermediates (i.e., -CN, -NH₂, =NH and -NCO) were produced; subsequent the oxidation of these intermediates resulted in the formation of final product and/or oxidative species NO⁺. The reaction of NO⁺ with the N-contained intermediates also generated the final conversion products. Catalytic intermediate formamide plays a critical role in the hydrolysis of HCN, and its hydrolysis leads to the formation of NH₃. Multiple cycle experiments demonstrate the long-term stability of the Cu-Mn-O catalyst. These results indicate that catalytic decomposition of HCN based on the Cu-Mn-O catalyst at low temperatures may be an efficient approach for the treatment of tail gases containing HCN.

低温HCN的创新处理技术的发展对于控制HCN污染至关重要。此处，制备了铜锰氧化物（Cu-Mn-O）催化剂，用于在80至200℃的温度下分解HCN。结果表明，Cu-Mn-O催化剂对HCN的转化表现出优异的催化性能。X射线光电子能谱分析表明，Mn ³⁺表现出很高的催化活性，并在很大程度上负责HCN的分解。HCN的N含产物包含NH ₃，NO / NO ₂，N ₂ O和N ₂，因此表明在催化剂上HCN分解过程中同时发生催化氧化和水解。以原位漫反射红外傅里叶变换为特征的催化氧化机理表明，生成了四种含氮中间体（即-CN，-NH ₂，= NH和-NCO）。随后这些中间体的氧化导致最终产物和/或氧化性物种NO ^+的形成。NO ⁺与含N的中间体的反应也产生了最终的转化产物。催化中间体甲酰胺在HCN的水解中起关键作用，其水解导致NH ₃的形成。多循环实验证明了Cu-Mn-O催化剂的长期稳定性。这些结果表明，在低温下基于Cu-Mn-O催化剂的HCN催化分解可能是处理含HCN尾气的有效方法。