期刊
JOURNAL OF RARE EARTHS
卷 36, 期 7, 页码 703-707出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jre.2018.01.017
关键词
Promoter; Co/CeO2 catalyst; Ammonia synthesis; Barium; Potassium; Rare earths
资金
- National Natural Science Foundation of China [21776047, 21203028]
The Co/CeO2 catalysts promoted with Ba or K were prepared to study the effect of promoter on the catalytic performance of ammonia synthesis. The results show that the presence of Ba or K promoter changes the properties of CeO2-supported Co catalysts including the surface area, the crystallite size and the morphology of CeO2, the reduction degree of cobalt species and the adsorption performance of hydrogen and nitrogen. As a consequence, the samples promoted with an appropriate amount of Ba show higher ammonia synthesis rates, while the catalysts with high Ba loading or K promoter all exhibit low catalytic activities. (C) 2018 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.
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