Monday, March 31, 2008 - 12:30 PM

Developing high performance hydrogen purification membranes for high temperature operation using ternary metal films

David Sholl1, Chen Ling1, Lymarie Semidey-Flecha1, Kent E. Coulter2, and J. Douglas Way3. (1) Georgia Institute of Technology, (2) Southwest Research Institute, (3) Colorado School of Mines

Thin metal membranes are a proven technology for hydrogen purification, but severe challenges remain for using these membranes in the high temperature environments relevant to coal gasification applications. Using multi-component alloys as membranes is a useful way to improve upon the properties of pure metal or binary alloy membranes, but systematic screening of the properties of ternary materials is extremely time consuming. We will describe a combined experimental and theoretical effort being used to identify membranes with high hydrogen permeabilities that can resist chemical poisons that affect many known membranes. We have developed modeling methods based on detailed first-principles calculations that predict the hydrogen permeability of ternary materials and have used these predictions to guide the fabrication and testing of freestanding alloy films.

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Back to The NHA Annual Hydrogen Conference 2008 (March 31-April 4 2008)