期刊
JOURNAL OF MEMBRANE SCIENCE
卷 378, 期 1-2, 页码 179-185出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2011.04.054
关键词
Pd-Cu; Hydrogen; Ultrathin; Intermediate layer; Scanning electron microscopy; Sievert's law
资金
- National Science Foundation
- Division of Chemical, Bioengineering, Environmental, and Transport Systems (CBET) [CBET-084316]
- CBET-084316, the National Energy Technology Laboratory
- Mombukagakusho Kakenhi [B 22-360,335]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0854316] Funding Source: National Science Foundation
Thin and defect-free Pd-Cu composite membranes with high hydrogen permeances and selectivities were prepared by electroless plating of palladium and copper on porous alumina supports with pore sizes of 5 and 100 nm coated with intermediate layers. The intermediate layers on the 100 nm supports were prepared by the deposition of boehmite sols of different particle sizes, and provided a graded, uniform substrate for the formation of defect-free, ultra-thin palladium composite layers. The dependence of hydrogen flux on pressure difference was studied to understand the dominant mechanism of hydrogen transport through a Pd-Cu composite membrane plated on an alumina support with a pore size of 5 nm. The order in hydrogen pressure was 0.98, and indicated that bulk diffusion through the Pd-Cu layer was fast and the overall process was limited by external mass-transfer or a surface process. Scanning electron microscopy (SEM) images of the Pd-Cu composite membrane showed a uniform substrate created after depositing one intermediate layer on top of the alumina support and a dense Pd-Cu composite layer with no visible defects. Cross-sectional views of the membrane showed that the Pd-Cu composite layer had a top layer thickness of 160 nm (0.16 mu m), which is much thinner than previously reported. (C) 2011 Elsevier B.V. All rights reserved.
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