Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 45, Issue 35, Pages 17540-17547Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.04.250
Keywords
bcc-PdCu alloy membrane; H-2 purification; Embrittlement resistance
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Funding
- National Natural Science Foundation of China [21606258]
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Pure Pd membranes could be used for H-2 purification only at high temperature (over 573 K) due to tendency to embrittlement when exposed to hydrogen at lower temperatures especially when approaching ambient temperature. To solve this problem, a double layer bcc-PdCu alloy membrane was prepared by alternating electrodeposition of Pd and Cu on a ceramic support membrane that allowed to be operated down to room temperature. The H-2 flux and N-2 leak rate (J(N2)) remained stable during 200 h continuous operation in H-2 at 303 K. Kinetic characteristics of the supported bcc PdCu membranes were explored over a wider temperature range as well. The marginal hydrogen solubility in bcc PdCu alloys and considerable H diffusivity guaranteed the excellent low-temperature tolerance and favorable H-2 permeability, rendering them promising candidates for processes that require H-2 separation at ambient temperatures. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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