Fabrication and operational considerations of hydrogen permeable Mo2C/V metal membranes and improvement with application of Pd
- Colorado School of Mines, Golden, CO (United States). Department of Chemical and Biological Engineering
Mo2C has previously been demonstrated as an effective catalyst layer to enable stable H2 permeation through vanadium foils at high temperatures. Here, in this paper, this approach was extended to several group V metal foils (V, Nb, and Ta) as well as mixed gas testing. The best permeability was achieved with V, and an activation process was developed to recover the performance of V foils displaying evidence of oxidation. Nb foils yielded ~20% the permeability of V, while Ta was too brittle to operate effectively. Mo2C/V membranes were operated at feed conditions well above the ductile-to-brittle transition pressure without embrittlement; however, the H2 permeability of Mo2C/V membranes was significantly attenuated at lower temperatures (< 600 °C). H2 permeation was also severely inhibited by the presence of N2 or CO2 in mixed gas environments due to strong competitive adsorption. The addition of a Pd catalyst layer on top of Mo2C improved mixed gas stability and increased H2 permeability to 2 × 10-8 mol·m-1·s-1·Pa-0.5 at 500 °C for V based membranes. Lastly, as an interlayer, Mo2C was demonstrated to be a stable barrier preventing Pd-V interdiffusion at 500 °C while simultaneously allowing significant H2 permeation.
- Research Organization:
- Colorado School of Mines, Golden, CO (United States)
- Sponsoring Organization:
- USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Nuclear Energy (NE)
- Contributing Organization:
- DOE Integrated University Program Graduate Fellowship; U.S. National Science Foundation
- Grant/Contract Number:
- AR0000785; 1512172; 0000785
- OSTI ID:
- 1457546
- Alternate ID(s):
- OSTI ID: 1548943
- Journal Information:
- Journal of Membrane Science, Vol. 549, Issue C; ISSN 0376-7388
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Recent Developments in Compact Membrane Reactors with Hydrogen Separation
|
journal | November 2018 |
Recent developments in compact membrane reactors with hydrogen separation
|
text | January 2018 |
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