Ti modified Pd-Ag membranes for hydrogen separation

Date

2015-06-29

Author

Piskin, Fatih
Akyildiz, Hasan
Öztürk, Tayfur

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

92
views

0
downloads

An investigation was carried out into Pd-Ag separation membranes to check whether a reduction in their Pd content was possible through the incorporation of a third element, namely Ti. For this purpose a combinatorial thin film deposition system was developed incorporating three sputter targets arranged in triangular form. The system had a substrate in the form of a magazine, 6 inch in diameter, accommodating 21 discs arranged again in triangular form aligned with the targets underneath. With this geometry, a library of thin film membranes was obtained in a single experiment covering a wide compositional field, Pd content up to of approx. 75%. The thin film library was then screened with respect their tendency to react with hydrogen. This was accomplished by the resistivity measurements carried out on the membranes, while they are subjected to heating-cooling cycle under hydrogen, the values being compared with identical cycle carried out under argon. Since permeability is a product of hydrogen solubility and diffusivity, membranes that react with hydrogen, i.e. either forming a solid solution or a hydride, delineate compositions which are candidates for separation membranes. In the present work, this procedure was applied to a portion of Ag-Ti Pd ternary system aiming for separation membranes with f.c.c. crystal structure. Mapping based on the resistivity measurement indicated, Ag35Ti22Pd43, Ag13Ti25Pd62 and their near compositions as possible candidates for separation membranes. Copyright (c) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Subject Keywords

Hydrogen separation membranes, Sputter deposition, Thin film membranes, Combinatorial approach, Resistivity measurement

URI

https://hdl.handle.net/11511/32401

Journal

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

DOI

https://doi.org/10.1016/j.ijhydene.2014.11.049

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Nb-Pd-Ti BCC thin films for hydrogen separation Piskin, Fatih; Öztürk, Tayfur (2019-02-15) An investigation was carried out into Nb-Pd-Ti ternary system to determine possible body-centered cubic (b.c.c.) membranes that can be used for hydrogen separation. A library of thin films was produced covering the greater portion of Nb-Pd-Ti ternary diagram using a combinatorial approach. The library was screened both structurally and in terms of a reactivity index defined as the ratio of the resistivity measured in the films under hydrogen and argon. The study showed that a substantial portion of composit...
GAS PERMEATION CHARACTERISTICS OF POLYMER-ZEOLITE MIXED MATRIX MEMBRANES SUER, MG; BAC, N; Yılmaz, Levent (1994-05-20) Mixed matrix membranes of polyethersulfone (PES), a glassy polymer, and hydrophilic zeolites 13X and 4A were prepared by using different membrane preparation procedures. Using selected procedure (c), the permeation rates of N2, O2, Ar, CO2 and H-2 were measured with a variety of membranes prepared at different zeolite loadings. Significant differences in measured permeability and calculated selectivity values demonstrated the importance of the type and percentage of zeolite. For both zeolitic additives, per...
Development of alumina supported ternary mixed matrix membranes for separation of H-2/light-alkane mixtures Topuz, Berna; Yılmaz, Levent; Kalıpçılar, Halil (2012-10-01) Ternary component mixed matrix membrane was prepared from PES, SAPO-34 and 2-hydroxy 5-methyl aniline on a macroporous alumina disk by the solvent evaporation method in order to investigate the effect of existence of an inorganic support. The membrane and its pure PES/Alumina counterpart were characterized by single gas permeability measurements of H-2, CH4, C2H6 and C3H8. The corresponding H-2/CH4 selectivities of membranes were 71.3 and 41. The membranes were also used to separate equimolar mixtures of H-...
Combinatorial screening of Pd-Ag-Ni membranes for hydrogen separation PİŞKİN, FATİH; Öztürk, Tayfur (2017-02-15) As an effort to reduce Pd content, a combinatorial study was carried out on Pd-Ag system with the addition of Ni as a third element. A magnetron sputtering system was used to create a thin film material library using three sputter targets arranged in a triangular fashion. A total of 21 glass discs were used as a substrate onto which membranes typically 3 mu m thick were deposited, each with a different composition covering a wide compositional field in Pd-Ag-Ni ternary phase diagram. Membranes produced were...
A New Homogeneous Catalyst for the Dehydrogenation of Dimethylamine Borane Starting with Ruthenium(III) Acetylacetonate Barin, Ebru Unel; Masjedi, Mehdi; Özkar, Saim (2015-06-01) The catalytic activity of ruthenium(III) acetylacetonate was investigated for the first time in the dehydrogenation of dimethylamine borane. During catalytic reaction, a new ruthenium(II) species is formed in situ from the reduction of ruthenium(III) and characterized using UV-Visible, Fourier transform infrared (FTIR), H-1 NMR, and mass spectroscopy. The most likely structure suggested for the ruthenium(II) species is mer-[Ru(N2Me4)(3)(acac)H]. Mercury poisoning experiment indicates that the catalytic dehy...

Citation Formats

F. Piskin, H. Akyildiz, and T. Öztürk, “Ti modified Pd-Ag membranes for hydrogen separation,” INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, pp. 7553–7558, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/32401.