F. Hydrogen Purification
1. Advanced Purification Systems
a) Pressure-swing adsorption
b) Absorption Goals: Conductivity, Reliability
c) Zeolites
Description: Develop simplified, one-step purification of natural gas, and new processes for oxygen enrichment of air streams, using “molecular gate technology.”
2. Materials
Goal: Reduce cost
a) Molecular Sieves
Description: Extrememly thin, hydrogen-selective membranes with precious metal alloys.
Goal: Stabilize membranes at high temperatures.
b) Gas separation membranes
i. Polyimide
ii. Nanocomposite polymers
iii. Organic nano polymers
c) Proton exchange oxides
Goals: Conductivity, Reliability
d) Membrane testing
Description: Establish test methods and standard membranes to support reliable comparisons of gas purification technologies.
d) Systems and Facilities
Goal: Cost, efficiency
3. Demonstrations
a) Fueling station
Description: Incorporate promising purification system technologies into an integrated H2 production, building power, and fueling system, at distributed locations (see V.D.2 for a complete description).
Goal: Evaluate efficiency, durability, and gain real-world experience.
i. Advanced reformate purification to support fueling of PEMFC vehicles.
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