Carbon cryogels and related methods
First Claim
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1. A carbon cryogel having a density of from about 0.20 to about 1.0 g/cm3, a surface area of from about 500 to about 3000 m2/g, a total pore volume of from about 1.0 to about 1.5 cm3/g, and a gas storage capacity of from about 0.0010 to about 0.015 mole/g at room temperature and at 500 psi.
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Abstract
Carbon cryogels, methods for making the carbon cryogels, methods for storing a gas using the carbon cryogels, and devices for storing and delivering a gas using the carbon cryogels.
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Citations
25 Claims
- 1. A carbon cryogel having a density of from about 0.20 to about 1.0 g/cm3, a surface area of from about 500 to about 3000 m2/g, a total pore volume of from about 1.0 to about 1.5 cm3/g, and a gas storage capacity of from about 0.0010 to about 0.015 mole/g at room temperature and at 500 psi.
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7. A carbon cryogel obtainable by the process of:
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(a) preparing a sol by mixing resorcinol, formaldehyde, and a catalyst in water;
(b) gelling the sol by heating at a temperature and for a time sufficient to provide a gel;
(c) washing the gel with acid to provide an acid-washed gel comprising an aqueous solvent;
(d) washing the acid-washed gel with a suitable organic solvent to exchange the aqueous solvent for an organic solvent to provide a solvent-exchanged gel;
(e) freeze drying the solvent-exchanged gel; and
(f) pyrolyzing the solvent-exchanged gel to provide a carbon cryogel, wherein the cryogel has a gas storage capacity of from about 0.0010 to about 0.015 mole/g.
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8. A method for making a carbon cryogel, comprising:
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(a) preparing a sol by mixing resorcinol, formaldehyde, and a catalyst in water;
(b) gelling the sol by heating at a temperature and for a time sufficient to provide a gel;
(c) washing the gel with acid to provide an acid-washed gel comprising an aqueous solvent;
(d) washing the acid-washed gel with a suitable organic solvent to exchange the aqueous solvent for an organic solvent to provide a solvent-exchanged gel;
(e) freeze drying the solvent-exchanged gel; and
(f) pyrolyzing the solvent-exchanged gel to provide a carbon cryogel. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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- 22. A method for gas storage, comprising contacting a vessel containing an adsorbate with a gas, wherein the adsorbate comprises a carbon cryogel having a density of from about 0.20 to about 1.0 g/cm3, a surface area of from about 500 to about 3000 m2/g, a total pore volume of from about 1.0 to about 1.5 cm3/g, and a gas storage capacity of from about 0.0010 to about 0.015 mole/g at room temperature and at 500 psi.
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24. A gas storage vessel, comprising a vessel and a carbon cryogel having a density of from about 0.20 to about 1.0 g/cm3, a surface area of from about 500 to about 3000 m2/g, a total pore volume of from about 1.0 to about 1.5 cm3/g, and a gas storage capacity of from about 0.0010 to about 0.015 mole/g at room temperature and at 500 psi.
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25. A carbon cryogel having a surface area of from about 2000 to about 3000 m2/g.
Specification