A New Ammonia Adsorber With Super Solid-Acid Adsorbents
Publication Date: 2004-May-25
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A New Ammonia Adsorber With Super Solid-Acid Adsorbents, for use in a fuel processing system for fuel cells, catalysts for removing ammonia.
A NEW AMMONIA ADSORBER WITH SUPER SOLID-ACID ADSORBENTS
FUEL PROCESSING FOR FUEL CELLS
Fuel reforming processes such as catalytic partial oxidation (CPOX) and auto-thermal reforming (ATR) may produce ammonia. If the ammonia is carried into the stack with the fuel stream it can deactivate the stack. Consequently, an ammonia adsorber is needed to get rid of the trace amounts of ammonia before sending the hydrogen rich fuel stream into the anode side of a fuel cell.
One solution is to use the super solid acid catalysts being developed by oil companies to adsorb ammonia. Most of the major oil companies have been putting a huge amount of effort, over many years, to develop a super solid acid catalyst to replace the HF used in the "alkylation process" (making sulfur free gasoline from C3 and C4's) in the refinery.
Since ammonia is basic, the super solid acids will most likely be able to effectively adsorb NH3, since the acidity of these catalysts is close to that of HF.
The super solid acid catalyst could be an effective ammonia adsorbent to prevent the trace amounts of ammonia from getting into the cell stack, which will improve the life of the cell stack. Meanwhile, since it is a solid adsorbent, there is a possiblity that this kind of adsorbents can be regenerated by heating up the adsorbtion bed to desorb the ammonia, and then re-use the adsorbent. This could reduce the cost of the ammonia adsorber.