Enhanced Resistance to CO Poisoning of Pd-based H2 Purification Membranes by Internal Oxidation
There have been many investigations of the permeation of Pd membranes by H2. The purpose of this one is to compare H2 permeation rates of pure Pd and internally oxidized Pd-Al alloys in the presence and absence of CO. It was shown recently that the rates of H2 absorption by the Pd matrix in a Pd /Al2O3 composite prepared by internal oxidation of Pd-Al alloys were significantly faster than by a pure Pd sample. Partially internally oxidized Pd-Al alloys also exhibited faster rates of H2 absorption than pure Pd. The most important observation was that the poisoning of H2 permeation by CO(g) was smaller for the internally oxidized alloys than for pure Pd. These results suggested that partially internally oxidized Pd-Al alloys may be useful for H2 purification membranes. Completely internally oxidized Pd-Al alloys would not be as suitable because internal oxidation may cause them to become brittle and to develop microcracks whereas partial internal oxidation maintains the inner, unoxidized portion ductile and crack free. This research describes H2 permeation measurements using Pd and a partially internally oxidized Pd0.955Al0.045 alloy in the presence and absence of CO.
- Research Organization:
- Savannah River Site (SRS), Aiken, SC (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC09-96SR18500
- OSTI ID:
- 812069
- Report Number(s):
- WSRC-MS-2003-00128; TRN: US200313%%30
- Journal Information:
- J. Alloys and Compounds, Other Information: PBD: 24 Jun 2003
- Country of Publication:
- United States
- Language:
- English
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