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Ryi S.-K.,Korea Institute of Energy Research | Li A.,University of British Columbia | Li A.,Membrane Reactor Technologies Ltd. | Lim C.J.,University of British Columbia | And 3 more authors.
International Journal of Hydrogen Energy | Year: 2011

This study presents a new non-alloy Ru/Pd composite membrane fabricated by electroless plating for hydrogen separation. It shows that palladium and ruthenium can be deposited on an aluminum-oxide-modified porous Hastalloy by using our new EDTA-free plating bath at room temperature and 358 K, respectively. A 6.8 μm thick non-alloy Ru/Pd membrane film could be plated and helium leak test confirmed that the membrane was free of defects. Hydrogen permeation test showed that the membrane had a hydrogen permeation flux of 4.5 × 10-1 mol m-2 s-1 at a temperature of 773 K and a pressure difference of 100 kPa. The hydrogen permeability normalized value with thickness of the membrane was 1.4 times higher than our pure Pd membrane having similar structure. The EDX profiles of the front and back side membrane, cross-sectional EDX line scanning and XRD profile show that there was no alloying progress between the palladium and ruthenium layer after hydrogen permeation test at 773 K. © 2010, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. Source


Boyd T.,Membrane Reactor Technologies Ltd. | Gulamhusein A.,Membrane Reactor Technologies Ltd. | Li A.,Membrane Reactor Technologies Ltd. | Tamhankar S.,Linde North America Inc. | And 2 more authors.
10AIChE - 2010 AIChE Spring Meeting and 6th Global Congress on Process Safety | Year: 2010

A novel hydrogen production demonstration unit using a natural gas feed was constructed and tested by the project partners (Linde North America Inc, Membrane Reactor Technologies Ltd (MRT), and Ergenics Corp). The novel reformer provided by MRT includes 25 palladium-alloy membranes to provide in-situ separation of hydrogen from the reforming zone. Hydrogen removal from the reactor shifts the thermodynamic equilibrium forward, so that high conversion rates of methane are achieved at relatively mild operating conditions. The membrane reformer and the 3-stage system MHC were successfully commissioned and operate well together in a demonstration system, though operational issues prevented the system operating at its full design rate. This is an abstract of a paper presented at the 2010 Spring National Meeting (San Antonio, TX 3/21-25/2010). Source


Ryi S.-K.,University of British Columbia | Ryi S.-K.,Membrane Reactor Technologies Ltd. | Xu N.,University of British Columbia | Li A.,University of British Columbia | And 5 more authors.
International Journal of Hydrogen Energy | Year: 2010

This study demonstrates palladium membranes can be electrolessly plated on aluminum oxide-modified porous Hastelloy with hydrazine using an EDTA-free bath. The plating bath temperature affected the membrane surface morphology, with the palladium grain size increasing with increasing temperature. A 7.5 μm thick membrane plating was obtained at room temperature. Helium leak testing confirmed that the membrane was free of defects. Hydrogen permeation test showed that the membrane had a hydrogen permeation flux of 3.3 × 10-1 mol m-2 s-1 at a temperature of 823 K and at a pressure difference of 100 kPa. There was no measurable interdiffusion between the membrane film and the porous Hastalloy substrate at 823 K. This room temperature membrane plating method provides several advantages such as very high selectivity, stability, favorable energy efficiency and simplicity. © 2010 Professor T. Nejat Veziroglu. Source

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