Enhancing carbon dioxide sorption rates using hygroscopic additives
First Claim
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1. A carbon dioxide sorbent useful in the removal of carbon dioxide from a gaseous stream, comprising:
- a. a metal oxide;
b. an alkali metal carbonate; and
c. an alkali fluoride;
whereby said sorbent is capable of absorbing carbon dioxide in relative humidities below about 25%.
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Abstract
Carbon dioxide sorption using a metal oxide-alkali metal carbonate sorbent typically requires a relative humidity of greater than 25% in order to obtain reaction rate constants of about 2.0 to 3.0 sec.-1 (see Equation 6). The incorporation of alkali halide salt into the metal oxide-alkali metal carbonate sorbent maintains rate constants of about 2.0 to about 4.0 sec.-1 at relative humidities below 25%. Therefore, the hygroscopic alkali halide salt attracts water, thereby providing the necessary hydroxide ions for enhanced absorption at low relative humidities.
42 Citations
19 Claims
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1. A carbon dioxide sorbent useful in the removal of carbon dioxide from a gaseous stream, comprising:
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a. a metal oxide; b. an alkali metal carbonate; and c. an alkali fluoride; whereby said sorbent is capable of absorbing carbon dioxide in relative humidities below about 25%. - View Dependent Claims (2, 3, 4, 5)
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6. A method for producing a carbon dioxide sorbent capable of absorbing carbon dioxide at relative humidities below about 25%, comprising the steps of:
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a. dissolving an alkali metal carbonate and an alkali halide salt in a solvent to from a solution; b. mixing metal carbonate into said solution to form a dispersion; c. forming said dispersion into the desired shape of the sorbent; d. drying said sorbent to remove said solvent; and e. converting said metal carbonate to metal oxide. - View Dependent Claims (7, 8, 9, 10, 11, 12, 19)
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13. A method for producing a supported carbon dioxide sorbent capable of absorbing carbon dioxide at relative humidities below about 25%, comprising the steps of:
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a. dissolving metal salt in a first solvent to form a metal salt solution; b. impregnating a support with said metal salt solution; c. converting said metal salt to a metal compound selected from the group consisting of metal oxide and metal carbonate; d. dissolving an alkali metal carbonate and an alkali halide salt in a second solvent to form a second solution; e. impregnating said impregnated support with said second solution to form a sorbent; and f. drying said sorbent to remove said second solvent. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification