A viable membrane reactor option for sustainable hydrogen production from ammonia

Title
A viable membrane reactor option for sustainable hydrogen production from ammonia
Authors
남석우한종희윤창원정향수조영석이찬현차준영
Keywords
Hydrogen production; Ammonia dehydrogenation; Fuel cell; Membrane reactor; Sustainable energy conversion
Issue Date
2018-10
Publisher
Journal of power sources
Citation
VOL 400-526
Abstract
Conventional hydrogen production from ammonia is both energy and process intensive, requiring high temperature and independent purification units. Here, we present a compact process of energy conversion from NH3 to electricity using a novel membrane reactor, comprised of a dense metallic Pd/Ta composite membrane and Ru/La-Al2O3 pellet catalysts, and a fuel cell unit. The fabricated Pd/Ta composite membrane, having ca. 5 times higher H2 permeability than conventional Pd-Ag membranes, can both lower NH3 dehydrogenation temperature and completely remove an additional hydrogen purification unit. Compared to a packed-bed reactor without membrane, ammonia conversion improves by 75 and 45%, respectively at 425 and 400&#8239; °C, and >99.5% of conversion is achieved at 450&#8239; °C under pressurized ammonia feed of 6.5&#8239; bar. Main barriers of practical application of Pd/Group V metals as a composite hydrogen permeable membrane, embrittlement and durability issues, are overcome owing to pertinent operating temperatures (400&#8211; 450&#8239; °C) of ammonia dehydrogenation coupled with membrane separation. Finally, as-separated hydrogen with <1&#8239; ppm of NH3 is provided directly to a polymer electrolyte membrane fuel cell, showing no performance degradation for an extended time of operation. The combined results suggest a feasible and less energy/process intensive option for producing hydrogen or electricity from ammonia.
URI
http://pubs.kist.re.kr/handle/201004/68090
ISSN
0378-7753
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KIST Publication > Article
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