Unconventional hydrogen permeation behavior of Pd/BCC composite membranes and significance of surface reaction kinetics

Title
Unconventional hydrogen permeation behavior of Pd/BCC composite membranes and significance of surface reaction kinetics
Authors
남석우한종희김용민윤창원정향수손현태조영석박용하이찬현함형철
Issue Date
2020-02
Publisher
Journal of membrane science
Citation
VOL 595, 117506
Abstract
As one of hydrogen purification techniques, membrane separation has a significant potential to directly obtain high-purity hydrogen from the mixed gas produced from various catalytic reactions. Specifically, dense metallic membranes exhibit several advantages including good mechanical strength under pressurized conditions, thermal stability, and high hydrogen selectivity. Conventionally, their permeation behavior is predicted from a numerical model known as the Sievert's law, which describes diffusion of hydrogen atoms through a metal layer. This study questions the validity of previous permeability trends of the Pd/BCC composite membranes and reveals the importance of surface reactions that significantly affect the permeation behavior of such membranes. A new permeation model developed, considering both the surface reactions at the catalytic layers and bulk diffusion through the metal layers, exhibits good correlation with the experimental permeation characteristics of the Pd/BCC composite membranes. Moreover, the diffusivity coefficients of BCC metals as a function of temperature is determined with higher accuracy than those reported in previous studies having temperature range inconsistency between hydrogen solubility and diffusivity. The experimental data along with the proposed model successfully accounts for the unique permeation characteristics of BCC metal membranes coated with catalytic layers and advances fundamental understanding of the permeation characteristics of the composite membrane, thereby accelerating the adoption and application of the composite membrane permeation model.
URI
http://pubs.kist.re.kr/handle/201004/71181
ISSN
0376-7388
Appears in Collections:
KIST Publication > Article
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