We prepared a disc-type Pd-Au alloy membrane, on which a Pt-ZrO2 protection layer was deposited to protect the hydrogen membrane from H2S poisoning. The effect of the protection layer on the performance and morphology of the Pd-Au alloy membrane during H2S exposure was investigated. The hydrogen flux did not decrease significantly in the presence of the protection layer, which covered the surface of the membrane. When the membrane with the protection layer was exposed to a mixture of H2S, the hydrogen flux decreased to 35% of the original value, which is half of the decrease observed with the bare Pd-Au membrane. The hydrogen flux of the poisoned membrane was almost completely recovered after changing back to pure H2 gas. Under harsh conditions, the membrane with the protection layer was found to retain the hydrogen flux and selectivity, while the selectivity of the bare membrane decreased to zero, indicating that it was disintegrated. This means that the Pt-ZrO2 layer prevents direct contact between Pd and H2S, thus protecting the Pd membrane from poisoning.
Bibliographical noteFunding Information:
This work was supported by the New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea ( 20143030040820 ).
© 2015 Elsevier B.V. All rights reserved.
- Hydrogen sulfide
- Pd alloy membrane
- Protection layer
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry