Jin-Qin Zhong, Zi-Peng Li, Dong-Dong Ren, Jian-Xiang Guo, Ji-Jin Wang, Lin-Yang Zhang, Na Liu
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引用次数: 0
摘要
烟气中碱金属的存在会导致催化剂中毒，从而严重影响催化剂的脱氮效率。目前还缺乏关于钾（K）中毒对 γ-Fe2O3 效率影响的具体研究。本研究基于 DFT 研究了 K 在 γ-Fe2O3 表面中毒的机理，分析了 K 对分子吸附和 SCR 反应过程的影响。结果表明，当 K2O 和 KCl 沉积在催化剂表面时，会提供 O、K 和 Cl 离子。在 O 和 Cl 铁位点附近，NH3 的吸附和脱氢过程得到不同程度的增强，但随后 NH2NO 的生成和分解受到抑制。在靠近 K 阳离子的位点上，NH3 的吸附、脱氢和随后的 SCR 反应过程受到阻碍，而在靠近 K 的铁位点上，对反应的不利影响更大。
Deactivation Mechanism of Potassium on the γ-Fe2O3 Catalysts for SCR Reaction: A DFT Study
The presence of alkali metals in flue gas can lead to catalyst poisoning, which can significantly impact the de-NOx efficiency of the catalyst. There is a lack of specific studies on the influence of potassium (K) poisoning on the efficiency of γ-Fe2O3. In this study, the mechanism of K poisoning on the γ-Fe2O3 surface was studied based on DFT, and the influence of K on molecular adsorption and SCR reaction process was analyzed. The results show that the K2O and KCl provide O, K, and Cl ions when deposited on the catalyst surface. The adsorption and dehydrogenation processes of NH3 were enhanced to varying degrees near the O and Cl iron sites, but the subsequent generation and decomposition of NH2NO were inhibited. On the sites near K cations, the adsorption, dehydrogenation, and subsequent SCR reaction processes of NH3 are hindered, and the adverse effects on the reaction are greater on the Fe sites closer to K. As well as the presence of K can to some extent promote the adsorption of NO and O2.
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Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis.
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