Nanostructured palladium-iron membranes for hydrogen separation and membrane hydrogenation reactions

被引：65

作者：

Bryden, KJ ^{[1
]}

Ying, JY ^{[1
]}

机构：

[1] MIT, Dept Chem Engn, Cambridge, MA 02139 USA

来源：

JOURNAL OF MEMBRANE SCIENCE | 2002年 / 203卷 / 1-2期

关键词：

gas separations; membrane reactors; metal membranes; nanostructured materials; poisoning;

D O I：

10.1016/S0376-7388(01)00736-0

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Hydrogen permselectivity and poisoning resistance of nanostructured palladium-iron alloy films were examined to evaluate these materials for potential membrane applications. At 200 degreesC, nanostructured palladium-iron films had hydrogen/helium selectivities of up to 35:1 and hydrogen fluxes of up to 10 sccm/cm(2). The rate-limiting step for hydrogen transport was diffusion through the bulk metal. Hydrogen flux in the nanostructured palladium-based membranes decreased with increasing iron content. The nanocrystalline membranes had higher hydrogen fluxes than coarse-grained polycrystalline systems of similar compositions. Nanostructured membranes also exhibited better resistance to hydrogen sulfide poisoning than polycrystalline membranes. When applied for the hydrogenation of ethene, the palladium-iron nanocrystalline membranes displayed stable activities over long time periods. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：29 / 42

页数：14

共 47 条

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