Journal
ENERGY
Volume 260, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2022.125209
Keywords
Membrane; Palladium; Membrane reactor; Ammonia; Green hydrogen
Categories
Funding
- Korea Evaluation Institute of Industrial Technology (KEIT), Alchemist project, Republic of Korea [20012383]
- Research and Development Program of the Korea Institute of Energy Research (KIER) [C2-2415]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20012383] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, an alumina sol assisted pretreatment method was used to prepare a highly selective Pd composite membrane for ammonia decomposition. The membrane reactor achieved high ammonia conversion and high-purity hydrogen production, with the advantage of selectively removing hydrogen.
In this study, an alumina sol assisted pretreatment method for porous metal supports was investigated for a highly selective Pd composite membrane for ammonia decomposition. Alumina sol made of boehmite was applied to an yttria-stabilized zirconia (YSZ) filled porous Inconel support. Additionally, a vacuum-assisted, two-step electroless plating of Pd drastically increased the hydrogen selectivity. The hydrogen permeation flux and selectivity (H-2/N2) measured at 723 K and a transmembrane pressure difference of 100 kPa were 3.40 x 10(-1) mol m(-2) s(-1) and 8,050, respectively. A highly selective Pd composite membrane was applied to a membrane reactor combined with a Ru/Al2O3 catalyst to efficiently produce high-purity hydrogen by ammonia decomposition. The ammonia decomposition test showed that the membrane reactor was able to achieve a high ammonia conversion (99.6%) and a high hydrogen purity (99.99%) with a hydrogen production rate of 0.25 Nm(3) h(-1) at 745 K and a gauge pressure of 500 kPa. The Pd composite membrane reactor has the advantage of being able to selectively removing hydrogen, increasing the ammonia conversion rate and high-purity hydrogen production via a one-step reaction combined with purification.
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