Journal
JOURNAL OF POWER SOURCES
Volume 506, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230081
Keywords
Ammonia decomposition; Hydrogen combustion; Copper; Boron nitride; Autothermal reactor design; Fuel cell
Funding
- National Research Foundation (NRF) - Korean government (Ministry of Science and ICT) [NRF-2019M3E6A1064611]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korean government (Ministry of Trade, Industry Energy) [20183010042020]
- KIST institutional program of the Korea Institute of Science and Technology [2E30202]
- Korea Institute of Energy Technology Evaluation & Planning (KETEP) [20183010042020] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2019M3E6A1064611] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Ammonia has been proposed as a viable carrier for hydrogen, and an efficient reaction system is needed to maximize usable energy. This study introduces the concept of autothermal recirculating reactor (ARR) and develops BN-coated Cu as a composite reactor material to enhance heat transfer for high-temperature hydrogen release reactions.
Ammonia (NH3) has been proposed as a viable hydrogen (H2) carrier, but high reaction temperature and endothermic nature of NH3 decomposition require an efficient reaction system to maximize useable energy from NH3. Adoption of carbon-free heat sources and efficient heat transfer to the reaction bed are crucial for sustainable H2 release. Herein, the autothermal recirculating reactor (ARR) concept with the fractional utilization of the reformate H2 as a clean combustion fuel is proposed and experimentally investigated. Additionally, BNcoated Cu as a composite reactor material is developed for heat transfer enhancement of high-temperature H2 release reaction in a thermally-coupled NH3 decomposition and H2 combustion system. Coating performance against chemical degradation of Cu has been tested and confirmed. High NH3 conversion of >99.6% and reforming efficiency of 70.95%, even with high fraction of heat loss owing to small scale validation, show feasibility of the as-proposed reformer. Operation of the suggested system is envisaged with self-sustained heat
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