The effect of Ag as a promoter for Ru/CeO2 catalysts in ammonia synthesis

被引：28
作者：
Lin, Jianxin [1 ]
Zhang, Liuming [1 ]
Wang, Ziqing [1 ]
Ni, Jun [1 ]
Wang, Rong [1 ]
Wei, Kemei [1 ]
机构：
[1] Fuzhou Univ, Natl Engn Res Ctr Chem Fertilizer Catalyst, Fuzhou 350002, Fujian, Peoples R China
来源：
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2013年 / 366卷
关键词：
Ruthenium catalyst; Silver; SMSI; Ammonia synthesis; CeO2; SUPPORTED RUTHENIUM CATALYSTS; NH3; SYNTHESIS; RU CATALYST; CS-RU/C; CARBON; CESIUM; ACTIVATION; BARIUM; ADSORPTION; DINITROGEN;
D O I：
10.1016/j.molcata.2012.10.019
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A series of Ag-Ru/CeO2 catalysts were prepared by conventional impregnation methods and characterized by XRD, BET, XPS, H-2-TPR, H-2-TPD-MS, and N-2-TPD. The activity test shows that ammonia concentration of the catalyst with 6% Ag is 9.4% at 10 MPa, 10,000 h(-1), 400 degrees C, which is 22% higher than that of Ru/CeO2. Such high catalytic activity was ascribed to three effects: electron donating property of partially reduced CeO2-x to Ru metal, the low workfunction of Ru atoms and the less competitive adsorbed between hydrogen and nitrogen on Ru atoms derived from the synergetic effect between Ag and Ru. Crown Copyright (c) 2012 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：375 / 379
页数：5
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