Claims
- 1. Activated carbon having a specific surface area of pores with a pore diameter greater than 20.ANG. in pore distribution of not less than 1,000 m.sup.2 /g determined from nitrogen adsorption isotherm and a ratio of specific surface area of those pores with a pore diameter greater than 20 .ANG. to the specific surface area of all of the pores of at least 0.45.
- 2. Activated carbon according to claim 1 in which the pores have an average particle diameter of 0.6 to 200 .mu.m.
- 3. Activated carbon according to claim 1 in which the ratio of the specific surface area of those pores with a pore diameter greater than 20 .ANG. in pore distribution to the specific surface area of all of the pores is at least 0.55.
- 4. A process for producing activated carbon which process comprises the successive steps of:
- (a) water-vapor activating a carbonaceous material to obtain a carbonaceous product, in which the ratio of specific surface area of those pores with a pore diameter greater than 20 .ANG. to the specific surface area of all of the pores is at least 0.30, and thereafter
- (b) subjecting carbonaceous product of step (a) to alkali activation to produce activated carbon having a specific surface area of pores with a pore diameter greater than 20.ANG. in pore distribution of not less than 1,000 m2/g determined from nitrogen adsorption isotherm and a ratio of specific surface area of those pores with a pore diameter greater than 20 .ANG. to the specific surface area of all of the pores of at least 0.45.
- 5. The process according to claim 4, wherein step (a) is carried out in the presence of water-vapor at a temperature of at least 900.degree. C.
- 6. The process according to claim 4, wherein the alkali activator used in step (b) is a hydroxide of an alkaline metal or a hydroxide of an alkaline earth metal.
- 7. The process according to claim 4, wherein alkali activation is carried out at a temperature of 400 to 1000.degree. C. for a period of not more than 3 hours.
- 8. A process for producing activated carbon, which process comprises the successive steps of:
- (a) carbonizing a carbonaceous material,
- (b) subjecting the carbonized carbonaceous material produced in step (a) to oxidation, and then
- (c) further subjecting the carbonaceous product obtained in step (b) to alkali activation to produce activated carbon having a specific surface area of pores with a pore diameter greater than 20 .ANG. in pore distribution of not less than 1,000 m2/g determined from nitrogen adsorption isotherm and a ratio of specific surface area of those pores with a pore diameter greater than 20 .ANG. to the specific surface area of all of the pores of at least 0.45.
- 9. The process according to claim 8, wherein the carbonization of step (a) is carried out at a temperature of at least 300.degree. C., and the oxidation treatment of step (b) is carried out in an oxygen-containing gas with an oxygen concentration of 2 to 50% at a temperature of 150 to 500.degree. C., or in an oxygen-containing solution having an oxygen concentration of 1 to 90%.
- 10. The process according to claim 8, wherein the carbonaceous material is coal.
- 11. An electric double layer-type capacitor having an electrode comprising activated carbon having a specific surface area of pores with a pore diameter greater than 20 .ANG. in pore distribution of not less than 1,000 m.sup.2 /g determined from nitrogen adsorption isotherm and a ratio of specific surface area of those pores with a pore diameter greater than 20 .ANG. to the specific surface area of all of the pores of at least 0.45.
Priority Claims (1)
Number |
Date |
Country |
Kind |
6-252061 |
Oct 1994 |
JPX |
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Parent Case Info
This is a rule 62 file wrapper continuation of application Ser. No. 08/544,809, filed Oct. 18, 1995, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
5143889 |
Takahiro et al. |
Sep 1992 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
0 514 545 A1 |
Nov 1992 |
EPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
544809 |
Oct 1995 |
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