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Title: Stable catalyst layers for hydrogen permeable composite membranes

Abstract

The present invention provides a hydrogen separation membrane based on nanoporous, composite metal carbide or metal sulfide coated membranes capable of high flux and permselectivity for hydrogen without platinum group metals. The present invention is capable of being operated over a broad temperature range, including at elevated temperatures, while maintaining hydrogen selectivity.

Inventors:
;
Publication Date:
Research Org.:
Colorado School of Mines, Golden, CO, USA
Sponsoring Org.:
USDOE
OSTI Identifier:
1117643
Patent Number(s):
8,6223,121
Application Number:
13/069,050
Assignee:
Colorado School of Mines (Golden, CO) DOEFE
DOE Contract Number:
FE0001009
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Way, J. Douglas, and Wolden, Colin A. Stable catalyst layers for hydrogen permeable composite membranes. United States: N. p., 2014. Web.
Way, J. Douglas, & Wolden, Colin A. Stable catalyst layers for hydrogen permeable composite membranes. United States.
Way, J. Douglas, and Wolden, Colin A. Tue . "Stable catalyst layers for hydrogen permeable composite membranes". United States. doi:. https://www.osti.gov/servlets/purl/1117643.
@article{osti_1117643,
title = {Stable catalyst layers for hydrogen permeable composite membranes},
author = {Way, J. Douglas and Wolden, Colin A},
abstractNote = {The present invention provides a hydrogen separation membrane based on nanoporous, composite metal carbide or metal sulfide coated membranes capable of high flux and permselectivity for hydrogen without platinum group metals. The present invention is capable of being operated over a broad temperature range, including at elevated temperatures, while maintaining hydrogen selectivity.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 07 00:00:00 EST 2014},
month = {Tue Jan 07 00:00:00 EST 2014}
}

Patent:

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  • This patent describes a gas dehydration process comprising contacting a water vapor-containing feed gas with one side of a composite membrane comprising a porous support and an ultrathin layer of a separation barrier of a sulfonated aromatic polymer having an average molecular weight above about 10,000 and a degree of sulfonation - S{sub m} of from about 0.2 to about 2 selected from the group of sulfonated polysulfone or sulfonated polyether ketone.
  • Various hydrogen production and hydrogen sulfide decomposition processes are disclosed that utilize composite metal membranes that contain an intermetallic diffusion barrier separating a hydrogen-permeable base metal and a hydrogen-permeable coating metal. The barrier is a thermally stable inorganic proton conductor.
  • Various hydrogen production and hydrogen sulfide decomposition processes are disclosed that utilize composite metal membranes that contain an intermetallic diffusion barrier separating a hydrogen-permeable base metal and a hydrogen-permeable coating metal. The barrier is a thermally stable inorganic proton conductor.
  • A method is provided for the preparation of metal/porous substrate composite membranes by flowing a solution of metal to be plated over a first surface of a porous substrate and concurrently applying a pressure of gas on a second surface of the porous substrate, such that the porous substrate separates the solution of metal from the gas, and the use of the resulting membrane for the production of highly purified hydrogen gas.
  • The goal of this experimental project is to design and fabricate a reactor and membrane test cell to dissociate hydrogen sulfide (H{sub 2}S) in a non-thermal plasma and recover hydrogen (H{sub 2}) through a superpermeable multi-layer membrane. Superpermeability of hydrogen atoms (H) has been reported by some researchers using membranes made of Group V transition metals (niobium, tantalum, vanadium, and their alloys), although it has yet to be confirmed in this study. Experiments involving methane conversion reactions were conducted with a preliminary pulsed corona discharge reactor design in order to test and improve the reactor and membrane designs using amore » non-toxic reactant. This report details the direct methane conversion experiments to produce hydrogen, acetylene, and higher hydrocarbons utilizing a co-axial cylinder (CAC) corona discharge reactor, pulsed with a thyratron switch. The reactor was designed to accommodate relatively high flow rates (655 x 10{sup -6} m{sup 3}/s) representing a pilot scale easily converted to commercial scale. Parameters expected to influence methane conversion including pulse frequency, charge voltage, capacitance, residence time, and electrode material were investigated. Conversion, selectivity and energy consumption were measured or estimated. C{sub 2} and C{sub 3} hydrocarbon products were analyzed with a residual gas analyzer (RGA). In order to obtain quantitative results, the complex sample spectra were de-convoluted via a linear least squares method. Methane conversion as high as 51% was achieved. The products are typically 50%-60% acetylene, 20% propane, 10% ethane and ethylene, and 5% propylene. First Law thermodynamic energy efficiencies for the system (electrical and reactor) were estimated to range from 38% to 6%, with the highest efficiencies occurring at short residence time and low power input (low specific energy) where conversion is the lowest (less than 5%). The highest methane conversion of 51% occurred at a residence time of 18.8 s with a flow rate of 39.4 x 10{sup -6} m{sup 3}/s (5 ft{sup 3}/h) and a specific energy of 13,000 J/l using niobium and platinum coated stainless steel tubes as cathodes. Under these conditions, the First Law efficiency for the system was 8%. Under similar reaction conditions, methane conversions were {approx}50% higher with niobium and platinum coated stainless steel cathodes than with a stainless steel cathode.« less