标题: Efficient catalytic ammonia synthesis using Cs-doped Ru/ZrO<sub>2</sub> catalysts prepared via a low eutectic system
作者: Du, JW (Du, Jingwei); Li, JJ (Li, Jinjun); You, ZX (You, Zhixiong)
来源出版物: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 卷: 131 页: 145-153 DOI: 10.1016/j.ijhydene.2025.04.193 Published Date: 2025 MAY 23
摘要: This study explores the preparation of a Cs-doped Ru/ZrO2 catalyst using a low eutectic system and its application in ammonia synthesis. Additionally, it examines the effect of Cs doping on enhancing the catalyst's resistance to hydrogen poisoning. Compared to the undoped Ru/ZrO2 catalyst and the Cs-Ru/ZrO2-B catalyst prepared through the grinding method for promoter incorporation, the Cs-Ru/ZrO2-A catalyst synthesized using the low eutectic system demonstrated significantly enhanced activity. At 400 degrees C and 0.1 MPa, the Cs-Ru/ZrO2-A catalyst achieved an ammonia synthesis activity of 1769 mu mol gcat - 1 h- 1, which is approximately 35 times higher than that of the undoped Ru/ZrO2 catalyst. The structure of the catalyst was analyzed using various material characterization techniques, including XRD, XPS, and SEM. The results showed that the Cs-Ru/ZrO2-A catalyst, prepared under identical conditions, exhibited no significant structural differences compared to other catalysts. However, further TPR and TPD analyses revealed that Cs interacts with Ru to some extent, affecting its reduction behavior and enhancing the catalytic reaction rate for ammonia synthesis. Additionally, detailed XPS analysis of all catalysts was conducted, leading to a proposed relationship between the catalytic reaction rate and the oxidation states of the metal components. The study revealed that the presence of Cs significantly inhibits hydrogen poisoning of the catalyst. Furthermore, it demonstrated that the addition of promoters enhances H2 dissociation by supplying electrons to the active metal Ru, while Cs plays a crucial role in effectively suppressing hydrogen poisoning.
作者关键词: Ammonia synthesis; Ruthenium catalyst; Cs-promotion; Zirconium oxide
KeyWords Plus: RUTHENIUM CATALYST; ZRO2; DECOMPOSITION; HYDROGENATION; KINETICS; SUPPORT
地址: [Du, Jingwei; Li, Jinjun; You, Zhixiong] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Hubei, Peoples R China.
通讯作者地址: You, ZX (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Hubei, Peoples R China.
电子邮件地址: [email protected]
影响因子：8.1
