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Carbon dioxide adsorbents containing magnesium oxide suitable for use at high temperatures

United States Patent

August 28, 2001
View the Complete Patent at the US Patent & Trademark Office
Adsorption of carbon dioxide from gas streams at temperatures in the range of 300 to C. is carried out with a solid adsorbent containing magnesium oxide, preferably promoted with an alkali metal carbonate or bicarbonate so that the atomic ratio of alkali metal to magnesium is in the range of 0.006 to 2.60. Preferred adsorbents are made from the precipitate formed on addition of alkali metal and carbonate ions to an aqueous solution of a magnesium salt. Atomic ratios of alkali metal to magnesium can be adjusted by washing the precipitate with water. Low surface area adsorbents can be made by dehydration and CO.sub.2 removal of magnesium hydroxycarbonate, with or without alkali metal promotion. The process is especially valuable in pressure swing adsorption operations.
Mayorga; Steven Gerard (Allentown, PA), Weigel; Scott Jeffrey (Allentown, PA), Gaffney; Thomas Richard (Allentown, PA), Brzozowski; Jeffrey Richard (Macungie, PA)
Air Products and Chemicals, Inc. (Allentown, PA)
09/ 370,006
August 6, 1999
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT The subject matter presented in this patent application was funded in part by the United States Department of Energy (DOE) under Cooperative Agreement No. DE-FC36-95GO10059. The DOE may have certain rights under the claims of any patent issuing from this application.