Carbon dioxide adsorbents containing magnesium oxide suitable for use at high temperatures
- Allentown, PA
- Macungie, PA
Adsorption of carbon dioxide from gas streams at temperatures in the range of 300 to 500.degree. 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.
- Research Organization:
- Air Products and Chemicals, Inc. (Allentown, PA)
- DOE Contract Number:
- FC36-95GO10059
- Assignee:
- Air Products and Chemicals, Inc. (Allentown, PA)
- Patent Number(s):
- US 6280503
- OSTI ID:
- 873949
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
dioxide
adsorbents
containing
magnesium
oxide
suitable
temperatures
adsorption
gas
streams
range
300
500
degree
carried
solid
adsorbent
preferably
promoted
alkali
metal
carbonate
bicarbonate
atomic
ratio
006
60
preferred
precipitate
formed
addition
aqueous
solution
salt
ratios
adjusted
washing
water
surface
dehydration
removal
hydroxycarbonate
promotion
process
especially
valuable
pressure
swing
operations
carbon dioxide
alkali metal
gas stream
aqueous solution
gas streams
magnesium oxide
pressure swing
swing adsorption
metal carbonate
solid adsorbent
metal carbon
atomic ratio
containing magnesium
especially valuable
oxide suitable
sorbent containing
/95/