Lee, Chan Hyun Jo, Young Suk Park, Yongha Jeong, Hyangsoo Kim, Yongmin Sohn, Hyuntae Yoon, Chang Won Nam, Suk Woo Ham, Hyung Chul Han, Jonghee 2024-01-19T18:03:48Z 2024-01-19T18:03:48Z 2021-09-05 2020-02-01 0376-7388 https://pubs.kist.re.kr/handle/201004/118975 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. English ELSEVIER PALLADIUM-COATED NIOBIUM METAL MEMBRANES DIFFUSION TANTALUM STORAGE SEPARATION TRANSPORT Unconventional hydrogen permeation behavior of Pd/BCC composite membranes and significance of surface reaction kinetics Article 10.1016/j.memsci.2019.117506 1 JOURNAL OF MEMBRANE SCIENCE, v.595 JOURNAL OF MEMBRANE SCIENCE 595 scie scopus 000501804600099 2-s2.0-85073569059 Engineering, Chemical Polymer Science Engineering Polymer Science Article PALLADIUM-COATED NIOBIUM METAL MEMBRANES DIFFUSION TANTALUM STORAGE SEPARATION TRANSPORT Pd/BCC membrane High-purity hydrogen Permeability Diffusivity Surface reaction