期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 45, 期 51, 页码 27210-27220出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.07.090
关键词
Cobalt; Ammonia decomposition; Alumina; Hydrogen; Synthesis method; Heterogeneous catalysis
资金
- UK Engineering and Physical Science Research Council (EPSRC)
- Sasol UK [EP/N013778/1, EP/L020432/2]
- EPSRC [EP/L020432/2] Funding Source: UKRI
Chemical hydrogen storage in molecules such as ammonia (>17 wt% H-2) have the unique potential to overcome the current storage and transport limitations of the H-2 economy. However, sustainable on-demand production of hydrogen via ammonia decomposition, requires the development of novel transition metal-based catalysts beyond the current use of highly active but expensive ruthenium to ensure economic feasibility. In this paper, we provide fundamental understanding of the effects of a range of synthetic methods of Co/gamma-Al2O3 catalysts on the resulting ammonia decomposition activity. The main activity determining factors are collectively the reducibility of the cobalt species and their particle size. This systematic work demonstrates that decreasing the cobalt particle size enhances the ammonia decomposition catalytic activity. However, a careful balance is required between a strong metal-support interaction leading to small particle sizes (promoted by precipitation methods) and the formation of inactive cobalt aluminate species (encouraged by adsorption methods). In addition, impurities such as boron and chloride remaining from particular synthetic methods were found to have detrimental effects on the activity. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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