标题：Ammonia synthesis over Cs- or Ba-promoted ruthenium catalyst supported on strontium niobate
作者： Chen, MX (Chen, Minxuan); Yuan, MW (Yuan, Mingwei); Li, JJ (Li, Jinjun); You, ZX (You, Zhixiong)
来源出版物： APPLIED CATALYSIS A-GENERAL 卷：554 页码: 1-9 DOI：10.1016/j.apcata.2018.01.006 出版年： MAR 25 2018
摘要：Strontium niobates with different crystalline structure and morphology have been prepared via a hydrothermal method and applied as a support for ruthenium catalyst in ammonia synthesis. The sample synthesized with a nominal Sr/Nb = 2.0, having a pure Sr2Nb2O7 crystalline phase and specific surface area of 87 m(2) g(-1), exhibits the best performance as support for Ru catalyst. The flake-structured Sr2Nb2O7 substrate induced epitaxial growth of truncated pyramid shaped ruthenium nanoparticles with a dispersion as high as 93%, which have abundant steps and B-5 sites playing a key role in ammonia synthesis catalysis. Adding Cs- or Ba-promoter enhanced the activity of Ru/Sr2Nb2O7 catalyst drastically. The highest ammonia synthesis rate over 8Cs- or 4Ba-2 wt%Ru/Sr2Nb2O7 was 4986 and 2317 (mu mol g(cat)(-1) h(-1)) at 0.1 MPa and 673 K, respectively. In addition, both catalysts were stable over reaction for 72 h at 673 K and 0.1 MPa. Thus, the synthesized Sr2Nb2O7 is expected to be a practically promising oxide support for ruthenium ammonia synthesis catalsyts.
作者关键词：Ammonia synthesis; Ruthenium catalysts; Strontium niobate; Cs-promotion; Ba-promotion
扩展关键词： ISOTOPIC TRANSIENT ANALYSIS; RU NANOPARTICLES; ZEOLITE-X; BARIUM; KINETICS; CARBON; ACTIVATION; ELECTRIDE; EFFICIENT; SRNB2O6
通讯作者地址：You, ZX (reprint author), Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430079, Hubei, Peoples R China.
You, ZX (reprint author), Int Cooperat Base Sustainable Utilizat Resources, Wuhan 430072, Hubei, Peoples R China.
[Chen, Minxuan; Yuan, Mingwei; Li, Jinjun; You, Zhixiong] Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430079, Hubei, Peoples R China.
[Chen, Minxuan; Yuan, Mingwei; You, Zhixiong] Int Cooperat Base Sustainable Utilizat Resources, Wuhan 430072, Hubei, Peoples R China.
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