Design of Thin Film Membranes for Intermediate-Temperature Hydrogen Separation

Download

index.pdf

Date

2018-03-15

Author

Pişkin, Fatih
Öztürk, Tayfur

Metadata

Show full item record

Item Usage Stats

224
views

68
downloads

Abstract:0243] Design of Thin Film Membranes for Intermediate-Temperature Hydrogen Separation Fatih Pişkin1 , Tayfur Öztürk2 1 ENDAM, Center for Energy Materials and Storage Devices, Dept. of Metallurgical and Materials Engineering, Middle East Technical University, Ankara, Turkey Dept. of Metallurgical and Materials Engineering, Muğla Sıtkı Koçman University, Muğla, Turkey 2 ENDAM, Center for Energy Materials and Storage Devices, Dept. of Metallurgical and Materials Engineering, Middle East Technical University, Ankara Separation membranes allow purification of hydrogen from gas mixtures that could be generated by various production methods such as steam reformation of hydrocarbons, coal gasification or biomass-based fermentation process. Here, each production method sets conditions for separation membranes in terms of operating conditions. Thus, the separation membranes are required to meet different process temperatures varying from ~600 °C to as low temperature as possible. The temperature intervals for hydrogen separation processes might be expressed into three categories such as; low temperature, RT-200 °C, intermediate-temperature, 300-450 °C, and high temperature, ≥450 °C. The current study concentrates on intermediate-temperature separation membranes, i.e. temperature 300-450 °C which are applicable to steam reformation of natural gas including the water gas shift reaction. Metallic membranes used for this purpose are quite attractive due to their high permeability together with a selectivity that is exceptional among other alternatives. The study adopts a membrane design methodology based on combinatorial material science. This approach makes use of magnetron sputtering whereby a library of thin film membranes are produced in a single experiment each membrane with a different composition. The library is then screened by four-probe resistivity measurements so as to identify compositions that react with hydrogen. A map of reactive index is prepared in the compositional field from which candidates were identified for hydrogen separation. The membranes were then fabricated in the form of foils and tested for hydrogen permeability. Using the above methodology, three ternary alloy system were evaluated, namely Nb-Pd-Ti, Pd-Ag-Ti, and Pd-Ag-Ni. Keywords: Hydrogen separation membranes, combinatorial approach, Pd-based membranes, Nb-based membranes, resistivity measurements.

URI

https://hdl.handle.net/11511/75487
https://pdffox.com/technologies-hydrogen-pdf-free.html

Conference Name

3rd International Hydrogen Technologies Congress, (March 15-18, 2018 )

Collections

Department of Metallurgical and Materials Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Surface Modified Metal Hydrides as Negative Electrodes in NiMH Batteries Eyövge, Cavit; Şahin, Ezgi Onur; Öztürk, Tayfur (null; 2018-10-28) Surface Modified Metal Hydrides as Negative Electrodes in NiMH BatteriesCavit Eyovge1,2, Ezgi Onur Sahin1,2 and Tayfur Ozturk1,21Center for Energy Materials and Storage Devices, Middle East Technical University, Ankara 2Dept. of Metallurgical and Materials Engineering, Middle East Technical University, Ankara There is a renewed interest in NiMH batteries with improved energy densities that could approach those of Li-ion batteries. Efforts to improve the energy density concentrates on alternative anod...
Experimental Investigation of the Original Project of Yukari Kalekoy Dam and Hydroelectric Power Plant Spillway Göğüş, Mustafa; Altan Sakarya, Ayşe Burcu; Köken, Mete (Elsevier BV; 2016-06-17) Hydraulic model tests of the spillway of Yukar Kalekoy Dam and Hydroelectric Power Plant (HPP) were carried out at Hydromechanics Laboratory of Middle East Technical University (METU), Ankara. In order to investigate the flow conditions in the approach channel, over the weir structure, around the spillway piers, along the spillway chute channels and after the flip buckets, and also to observe the performance of the aeration devices, a model of 1/70 length scale was constructed. The model area covers an abou...
Synthesis and structural characterization of co-al binary alloys Dinler, Ali Fırat; Mekhrabov, Amdulla O.; Akdeniz, Mahmut Vedat (null; 2018-10-27) As a part of an investigation on the design and development of Co-based superalloys for hightemperature applications, studies have been made to investigate synthesis route, heat treatment regime and structural characterization of binary Co-Al alloys. Cobalt-rich side of Co-Al binary system was examined by preparing 6 different alloy compositions (1.23, 8.40, 16.72, 19.50, 21.50 and 25 at. % Al), which were produced by arc melting technique. It has been found that DOOR\V KDYLQJ UHODWLYHO\ KLJK $O FRQWHQW ...
Synthesis of acrylic based high internal phase emulsion polymers and their application in chromatography Tunç, Yeliz; Hasırcı, Nesrin; Department of Polymer Science and Technology (2009) High internal phase emulsion polymers (PolyHIPEs) are new generation materials with their high porosity and interconnected open-cell structures and finds applications in areas such as supports for catalytic systems, separation media and tissue engineering scaffolds. Styrene based PolyHIPEs are currently the most popular choice, but solvent compatibility and poor mechanical properties of these materials prevent their applications. Therefore development of new polyHIPEs with desired mechanical and cellular pr...
Design constraints for gas-liquid catalytic microreactors Üner, Necip Berker; Üner, Deniz; Erkoç, Ertuğrul; Department of Chemical Engineering (2014) Microreactors are a promising class of chemical reactors, which can provide high conversion, selectivity, heat-mass transfer rates and safety in production. They can accommodate gas-liquid or gas-liquid-solid reactions very well. The aim of this study is to present some new mass transfer and kinetics oriented physical phenomena and operation strategies that can emerge in multiphase microreactors, which are usually overlooked in macroscale reactors. The first example is demonstrated experimentally by absorbi...

Citation Formats

F. Pişkin and T. Öztürk, “Design of Thin Film Membranes for Intermediate-Temperature Hydrogen Separation,” Alanya, Türkiye, 2018, vol. 1, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/75487.