US4978649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous carbonaceous material
Assignee: Individual
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Filing: 1989-04-19
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Granted: 1990-12-18
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Expires: 2009-04-19
Abstract
Abstract The present invention relates to physical chemistry. The material is made as a three-dimensional matrix with a pore volume of from 0.2 to 1.7 cm 3 /g. The matrix is formed by bent layers of carbon of 100-10,000 Å thickness and 100-10000 Å radius of curvature. The true density of the material according to the present invention is 1.80-2.10 g/cm 3 , its X-ray density is 2.112-2.236 g/cm 3 , the pore size distribution has its maximum within the range of 200-2,000 Å. The present invention can be useful in, for example, in the production of catalysts.
Inventors
- 👤 Vitaly F. Surovikin
- 👤 Georgy V. Plaxin
- 👤 Vladimir A. Semikolenov
- 👤 Vladimir A. Likholobov
- 👤 Ilona J. Tiunova
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:11
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/20; B01J21/00; B01J21/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
A process for producing a porous carbonaceous material, comprising heating a mass of granules of carbon black, to between 750° and 1,200° C., while continuously stirring the heated granules to prevent their sticking together, passing hydrocarbons through the mass of granules under conditions wherein said hydrocarbons decompose into carbon and deposit the carbon on the surface of the granules, and treating said granules with an activator gas comprising steam for 0.5 to 7 hours to form a pore volume of 0.2 to 1.7 cm 3 /g and to increase the proportion of pores of a size of more than 200 Å.
Claim 2
Dependent Claim
101 words
A process for producing a porous carbonaceous material, comprising heating a mass of granules of carbon black, to between 750° and 1,200° C., while continuously stirring the heated granules to prevent their sticking together, passing hydrocarbons through the mass of granules under conditions wherein said hydrocarbons decompose into carbon and deposit the carbon on the surface of the granules, and treating said granules with an activator gas comprising steam for 0.5 to 7 hours to form a pore volume of 0.2 to 1.7 cm 3 /g and to increase the proportion of pores of a size of more than 200 Å.
Claim 3
Dependent Claim
17 words
A process as claimed in claim 1, wherein said activator gas is steam or a steam-air mixture.
Claim 4
Dependent Claim
76 words
A porous carbonaceous material prepared by the process of claim 1 in the form of a three-dimensional matrix with a pore volume of 0.2-1.7 cm 3 /g formed by bent layers of carbon of 100-10,000 Å thickness and a radius of curvature of 100-10,000 Å, a true density of said material being equal to 1.80-2.10 g/cm 3 , X-ray density--2.112-2.236 g/cm 3 and the pore size distribution having its maximum within the range of 200-2,000 Å.
Claim 5
Dependent Claim
27 words
A porous carbonaceous material according to claim 3, which is biporous and wherein the pore size distribution has an additional maximum within the range of 40-200 Å.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-17 | 1994-06-18 | 1994-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-17 | 1998-06-18 | 1998-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-17 | 2002-06-18 | 2002-12-18 | $7700.00 | Window Closed / Lapsed |