Jo, Young Suk Lee, Chan Hyun Kong, Seong Young Lee, Kwan-Young Yoon, Chang Won Nam, Suk Woo Han, Jonghee 2024-01-19T22:04:59Z 2024-01-19T22:04:59Z 2021-09-03 2018-07-12 1383-5866 https://pubs.kist.re.kr/handle/201004/121154 Group VB metals, as candidates for hydrogen separation metallic membrane, suffer from low surface catalytic activity and mechanical integrity issues due to hydrogen embrittlement, which limited their practical application for mixed gas purification. This study overcomes these problems and successfully demonstrates operation schemes of a Pd/Ta composite membrane, prepared by an electroless deposition of a thin Pd layer on a bulk Ta surface. The fabricated Pd/Ta composite membrane presented higher permeability (4.7 x 10(-8) mol m(-1) s(-1) pa(-0.5)) than that of Pd-based metallic membranes reported in the previous literatures, and gas chromatography analysis proved a fuel-cell grade high-purity hydrogen (purity of 99.999% and < 10 ppm CO) separation from the mixed gas (CO, CO2, H2O, and H-2) at between 400 and 500 degrees C. Moreover, a membrane module was also prepared for treating 26 L min(-1) of mixed gas feed flow and separating about 6.9 L min(-1) of pure hydrogen with feed side hydrogen partial pressure of 4.3 bar. Leak-free operation of the module was possible under pressurized conditions (< 10 bar), and hydrogen embrittlement issues of Ta could be successfully avoided by tailoring the operating conditions. English ELSEVIER SCIENCE BV ENHANCED REACTION PROCESS METAL MEMBRANES PALLADIUM MEMBRANES ALLOY MEMBRANES PD PERMEABILITY PURIFICATION PERFORMANCE PERMEATION TRANSPORT Characterization of a Pd/Ta composite membrane and its application to a large scale high-purity hydrogen separation from mixed gas Article 10.1016/j.seppur.2017.12.019 1 SEPARATION AND PURIFICATION TECHNOLOGY, v.200, pp.221 - 229 SEPARATION AND PURIFICATION TECHNOLOGY 200 221 229 scie scopus 000431157200024 2-s2.0-85042717326 Engineering, Chemical Engineering Article ENHANCED REACTION PROCESS METAL MEMBRANES PALLADIUM MEMBRANES ALLOY MEMBRANES PD PERMEABILITY PURIFICATION PERFORMANCE PERMEATION TRANSPORT Pd/Ta composite membrane Fuel-cell grade high-purity hydrogen Hydrogen purification Permeability Dense metallic membranes