催化作用
化学
吸附
脱氢
离解(化学)
基本反应
密度泛函理论
反应机理
无机化学
光化学
选择性催化还原
分解
催化剂中毒
反应性(心理学)
物理化学
催化剂载体
动力学
计算化学
有机化学
物理
量子力学
医学
替代医学
病理
作者
Guomeng Zhang,Ye Jiang,Qingyi Li,Yan Xu,Congcong Su,Hongwei Ge,Xianrui Dou,Zhengda Yang
标识
DOI:10.1016/j.mcat.2023.113446
摘要
The presence of alkali metal Na in flue gas can significantly impair the reactivity of Ce/TiO2 (CT) SCR (Selective Catalytic Reduction) catalyst. This study investigates the deactivation mechanism of Na on the Ce/TiO2 catalyst using Density Functional Theory (DFT) calculations, focusing on the adsorption of surface species and the pathway of elementary reaction. Due to the high affinity between Na atom and the catalyst surface, Na poisoning readily occurs on Ce/TiO2 (001) surface. The presence of Na on the catalyst surface hampers hydrogenation, oxygen vacancy formation, and NH3 adsorption, while also reducing the catalyst's acidity and reducibility. Additionally, Na impedes the NH3 dehydrogenation reaction, as well as the formation and decomposition of NH2NO and the dissociation of O2 on the catalyst surface, thereby inhibiting the NH3-SCR reaction. The inhibition of NO2 formation further affects the fast SCR reaction, which may explain the low-temperature deactivation of the catalyst.
科研通智能强力驱动
Strongly Powered by AbleSci AI