Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 47, Issue 4, Pages 2608-2621Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.10.187
Keywords
On-site hydrogen production; Ammonia decomposition; Ba(Zr,Y)O3-delta (BZY); Hydrogen poisoning effect; Hydrogen spillover
Categories
Funding
- National Key Research & Development Project [2017YFE0129300]
- Na-tional Natural Science Foundation of China [U20A20251, 22005105]
- National Key R&D Program of China [2018YFB150039]
- Ningbo major special projects of the Plan Science and Technology Innovation 2025 [2019B10043]
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This study investigates the influence of synthesis conditions on the catalytic activity of Ni/BZY catalysts for ammonia decomposition, revealing a Ni/BZY catalyst with excellent catalytic performance and proposing a mechanism of hydrogen spillover from Ni to the BZY support.
On-site produced hydrogen from ammonia decomposition can directly fuel solid oxide fuel cells (SOFCs) for power generation. The key issue in ammonia decomposition is to improve the activity and stability of the reaction at low temperatures. In this study, proton-conducting oxides, Ba(Zr,Y) O3-delta (BZY), were investigated as potential support materials to load Ni metal by a one-step impregnation method. The influence of Ni loading, Ba loading, and synthesis temperature, of Ni/BZY catalysts on the catalytic activity for ammonia decomposition were investigated. The Ni/BZY catalyst with Ba loading of 20 wt%, Ni loading of 30 wt%, and synthesized at 900 degrees C attained the highest ammonia conversion of 100% at 600 degrees C. The kinetics analysis revealed that for Ni/BZY catalyst, the hydrogen poisoning effect for ammonia decomposition was significantly suppressed. The reaction order of hydrogen for the optimized Ni/BZY catalyst was estimated as low as -0.07, which is the lowest to the best of our knowledge, resulting in the improvement in the activity. H-2 temperature programmed reduction and desorption analysis results suggested that a strong interaction between Ni and BZY support as well as the hydrogen storage capability of the proton-conducting support might be responsible for the promotion of ammonia decomposition on Ni/BZY. Based on the experimental data, a mechanism of hydrogen spillover from Ni to BZY support is proposed. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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