标題: Inhibited hydrogen poisoning for enhanced activity of promoters-Ru/Sr2Ta2O7 nanowires for ammonia synthesis

作者: Huang, J (Huang, Jia); Yuan, MW (Yuan, Mingwei); Li, XZ (Li, Xiaozhong); Wang, Y (Wang, Yan); Li, MW (Li, Mengwei); Li, JJ (Li, Jinjun); You, ZX (You, Zhixiong)

來源出版物:JOURNAL OF CATALYSIS   卷: 389  頁: 556-565  DOI: 10.1016/j.jcat.2020.06.037  出版年: SEP 2020  

摘要: In this work, strontium tantalate (Sr2Ta2O7) nanowires were used for the first time as a support of ruthenium catalysts for ammonia synthesis. The highest ammonia synthesis activity of 1582 mu mol g(cat)(-1) h(-1) was observed with Ru/Sr2Ta2O7 catalysts prepared with molar ratio of Sr(OH)(2)/Ta2O5 at 4. After loading promoters, the ammonia synthesis activity was significantly improved to 4856, 5004 and 5038 mu mol g(cat)(-1) h(-1) for K-, Rb- and Cs- modified Ru/Sr2Ta2O7 catalysts. Characterization and kinetic experiments indicate that the improved ammonia synthesis rate of promoters-Ru/Sr2Ta2O7 catalysts was attributable to the combined effect of alleviated hydrogen poisoning through the promotion of hydrogen spillover from Ru species to support of Sr2Ta2O7 and enhanced activation of N-2 due to increased electron density of Ru sites because of electron donation from introduced oxygen vacancies and promoters. The study not only clarifies the role of promoters in ammonia synthesis, but also provides an excellent Ru catalyst on Sr2Ta2O7 nanowires for ammonia synthesis. (C) 2020 Elsevier Inc. All rights reserved.

入藏号: WOS:000566793700012

語言: English

文獻類型: Article

作者關鍵詞: Ammonia synthesis; Sr2Ta2O7; Promoters; Ru catalyst; Oxygen vacancies; Alleviated hydrogen poisoning

地址: [Huang, Jia; Yuan, Mingwei; Li, Xiaozhong; Wang, Yan; Li, Mengwei; Li, Jinjun; You, Zhixiong] Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China.

[Huang, Jia; Yuan, Mingwei; Li, Xiaozhong; Wang, Yan; Li, Mengwei; You, Zhixiong] Int Cooperat Base Sustainable Utilizat Resources, Wuhan 430072, Peoples R China.

通訊作者地址: You, ZX (通訊作者)，Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China.

You, ZX (通訊作者)，Int Cooperat Base Sustainable Utilizat Resources, Wuhan 430072, Peoples R China.

電子郵件地址: zyou@whu.edu.cn