期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 47, 期 4, 页码 2433-2441出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.10.204
关键词
Ammonia synthesis; Ruthenium catalyst; Ceria support; Cesium promoter; Energy carrier; Electron donation
资金
- CREST, Japan Science and Tech-nology Agency [JPMJCR1441]
The study presents a novel supported ruthenium catalyst for ammonia synthesis, with optimized Ru and Cs+ promoter contents to enhance the synthesis rate. Introduction of Cs+ promoter before Ru impregnation increases particle size of the catalyst and decreases active sites, but the TOF of the catalyst remains high.
A supported ruthenium catalyst (Ru/Cs+/CeO2) for ammonia synthesis is described which incorporates a large amount of a Cs+ promoter in a porous CeO2 support to enhance the electron donation effect of the alkali promoter on the ruthenium catalyst. Optimization of the Ru and Cs+ promoter contents improves the ammonia synthesis rate to more than 4 times that of the benchmark catalyst (Cs+/Ru/MgO) at 350 degrees C and 0.1 MPa, and the ammonia synthesis rate is stable for 100 h. Introduction of the Cs+ promoter into the support before the Ru impregnation increases the particle size of the Ru catalyst. Despite a decrease in the number of active sites, the TOF of the catalyst is more than 50 times that of Ru (2 wt%)/CeO2. CO adsorption measurements suggest an electron donating effect by the Cs+ promoter to ruthenium metal. Reaction order analysis indicates this is due to a mitigation of hydrogen poisoning. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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