A viable membrane reactor option for sustainable hydrogen production from ammonia
- A viable membrane reactor option for sustainable hydrogen production from ammonia
- 남석우; 한종희; 윤창원; 정향수; 조영석; 이찬현; 차준영
- Hydrogen production; Ammonia dehydrogenation; Fuel cell; Membrane reactor; Sustainable energy conversion
- Issue Date
- Journal of power sources
- VOL 400-526
- 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  °C, and >99.5% of conversion is achieved at 450  °C under pressurized ammonia feed of 6.5  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– 450  °C) of ammonia dehydrogenation coupled with membrane separation. Finally, as-separated hydrogen with <1  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.
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