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Challenges 2017, 8(1), 4; doi:10.3390/challe8010004

New Studies of the Physical Properties of Metallic Amorphous Membranes for Hydrogen Purification

1
Consiglio Nazionale delle Ricerche, Istituto dei Sistemi Complessi, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Roma, Italy
2
Department of Physics, Sapienza University of Rome, Piazzale A. Moro 5, 00185 Roma, Italy
3
Department of Chemical and Materials Engineering, University of Nevada, Reno, NV 89557, USA
4
Commonwealth Scientific and Industrial Research Organisation, Queensland Centre for Advanced Technologies, Energy, 1 Technology Court, Pullenvale, QLD 4069, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Palmiro Poltronieri
Received: 22 December 2016 / Revised: 6 February 2017 / Accepted: 7 February 2017 / Published: 10 February 2017
(This article belongs to the Special Issue Selected papers from Thematic Meeting “Materials for Energy”)
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Abstract

Amorphous metallic membranes display promising properties for hydrogen purification up to an ultrapure grade (purity > 99.999%). The hydrogen permeability through amorphous membranes has been widely studied in the literature. In this work we focus on two additional properties, which should be considered before possible application of such materials: the propensity to crystallize at high temperatures should be avoided, as the crystallized membranes can become brittle; the hydrogen solubility should be high, as solubility and permeability are proportional. We investigate the crystallization process and the hydrogen solubility of some membranes based on Ni, Nb, and Zr metals, as a function of Zr content, and with the addition of Ta or B. The boron doping does not significantly affect the crystallization temperature and the thermal stability of the membrane. However, the hydrogen solubility for p ~7 bar is as high as H/M ~0.31 at T = 440 °C and H/M ~0.27 at T = 485 °C. Moreover, the membrane does not pulverize even after repeated thermal cycles and hydrogenation processes up to 485 °C and 7 bar, and it retains its initial shape. View Full-Text
Keywords: amorphous membranes; hydrogen purification; hydrogen solubility; crystallization amorphous membranes; hydrogen purification; hydrogen solubility; crystallization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Palumbo, O.; Trequattrini, F.; Sarker, S.; Hulyakar, M.; Pal, N.; Chandra, D.; Dolan, M.; Paolone, A. New Studies of the Physical Properties of Metallic Amorphous Membranes for Hydrogen Purification. Challenges 2017, 8, 4.

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