US3923533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally stable and crush resistant microporous glass catalyst supports
Assignee: PPG Industries Inc
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Filing: 1974-03-01
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Granted: 1975-12-02
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Expires: 1994-03-01
Abstract
Abstract Thermally stable, mechanically strong microporous glass articles with large pore volumes, surface areas, and varying pore sizes, and methods for making such articles are disclosed. In particle form, such as beads, the microporous glass articles are useful as catalyst supports in applications such as petroleum catalytic refiners, chemical processes and motor vehicle catalytic mufflers. The mechanical strength and the dimensional stability of the microporous glass articles at elevated temperatures can be improved if the articles are preshrunk, such as by brief exposure to high temperatures, before their intended use, and can be improved even further if treated with certain metal oxides.
Inventors
- 👤 Joseph J Hammel
- 👤 Ties Allersma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:57
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/02; B01D71/04; B01D39/00; B01D39/02; B01D39/06; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D67/00; B01D67/0039; B01D67/0053; B01D67/0058; B01J; B01J21/00; B01J21/06; B01J21/08; B01J37/00; B01J37/06; C; C03; C03C; C03C11/00; C03C11/005; C03C15/00; C03C3/00; C03C3/04; C03C3/06; C03C3/062; C03C3/064; C03C3/076; C03C3/089; C03C3/091; C03C2201/00; C03C2201/06; C03C2201/08; C03C2201/10; C03C2201/30; C03C2201/32; C03C2201/50; C03C2201/80; C03C2203/00; C03C2203/10; C03C2203/50
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
125 words
A STRONG, THERMALLY STABLE, MICROPOROUS GLASS ARTICLE HAVING A PORE VOLUME OF AT LEAST 0.35 CUBIC CENTIMETERS PER GRAMS, PORE SIZES RANGING FROM 50 TO 200 ANGSTROM UNITS, AND A SURFACE AREA OF AT LEAST 100 SQUARE METERS PER GRAM, COMPRISING: A. AT LEAST 96 PERCENT BY WEIGHT SIO2, B. LESS THAN 4 PERCENT BY WEIGHT B2O3, C. LESS THAN 0.05 PERCENT BY WEIGHT ALKALI METAL OXIDE, AND D. LESS THAN 0.4 PERCENT BY WEIGHT AL2O3, SAID MICROPOROUS GLASS ARTICLE HAVING A CRUSH STRENGTH OF AT LEAST 20 POUNDS PER SQUARE INCH GUAGE, AND LOSING LESS THAN 30 PERCENT OF ITS ORGINAL SURFACE AREA AND UNDERGOING LESS THAN 25 PERCENT VOLUME SHRINKAGE WHEN THE ARTICLE IS SUBJECTED TO A TEMPERATURE OF 980*C. FOR 24 HOURS.
Claim 2
Dependent Claim
125 words
A STRONG, THERMALLY STABLE, MICROPOROUS GLASS ARTICLE HAVING A PORE VOLUME OF AT LEAST 0.35 CUBIC CENTIMETERS PER GRAMS, PORE SIZES RANGING FROM 50 TO 200 ANGSTROM UNITS, AND A SURFACE AREA OF AT LEAST 100 SQUARE METERS PER GRAM, COMPRISING: A. AT LEAST 96 PERCENT BY WEIGHT SIO2, B. LESS THAN 4 PERCENT BY WEIGHT B2O3, C. LESS THAN 0.05 PERCENT BY WEIGHT ALKALI METAL OXIDE, AND D. LESS THAN 0.4 PERCENT BY WEIGHT AL2O3, SAID MICROPOROUS GLASS ARTICLE HAVING A CRUSH STRENGTH OF AT LEAST 20 POUNDS PER SQUARE INCH GUAGE, AND LOSING LESS THAN 30 PERCENT OF ITS ORGINAL SURFACE AREA AND UNDERGOING LESS THAN 25 PERCENT VOLUME SHRINKAGE WHEN THE ARTICLE IS SUBJECTED TO A TEMPERATURE OF 980*C. FOR 24 HOURS.
Claim 3
Dependent Claim
22 words
The microporous glass article of claim 1 which is in particle form and has a diameter of from 0.05 to 5 millimeters.
Claim 4
Dependent Claim
40 words
The microporous glass article of claim 2, which has the following compression expressed as percent by weight: a. 96-99 percent SiO2, b. 1-3 percent B2O3, c. 0-0.03 percent R2O, where R is sodium or potassium, and d. 0-0.4 percent Al2O3.
Claim 5
Dependent Claim
56 words
The microporous glass article of claim 3 which has been shrunk by 5 to 20 percent of its original volume and which has a crush strength of at least 30 pounds per square inch gauge and undergoes less than 10 percent volume shrinkage when the particle is subjected to a temperature of 980*C. for 24 hours.
Claim 6
Dependent Claim
98 words
A highly microporous glass article having a pore volume of 0.5 to 0.7 cubic centimeters per gram and pore size diameters ranging from 200 to 1,000 Angstrom units, comprising: a. at least 96 percent by weight SiO2, b. less than 4 percent by weight B2O3, c. less than 0.05 percent by weight alkali metal oxide, and d. less than 0.4 percent by weight Al2O3; said microporous glass article having a crush strength of 5 to 10 pounds per square inch gauge and undergoing about a 10 to 20 percent volume shrinkage when subjected to 760*C. for 24 hours.
Claim 7
Dependent Claim
98 words
A highly microporous glass article having a pore volume of 0.5 to 0.7 cubic centimeters per gram and pore size diameters ranging from 200 to 1,000 Angstrom units, comprising: a. at least 96 percent by weight SiO2, b. less than 4 percent by weight B2O3, c. less than 0.05 percent by weight alkali metal oxide, and d. less than 0.4 percent by weight Al2O3; said microporous glass article having a crush strength of 5 to 10 pounds per square inch gauge and undergoing about a 10 to 20 percent volume shrinkage when subjected to 760*C. for 24 hours.
Claim 8
Dependent Claim
55 words
The microporous glass article of claim 5 which is in particle form having a diameter of from 0.05 to 5 millimeters, and which has the following composition expressed as percent by weight: a. 96-99 percent SiO2, b. 1-3 percent B2O3, c. 0-0.03 percent R2O, where R is sodium or potassium, and d. 0-0.4 percent Al2O3.
Claim 9
Dependent Claim
20 words
The microporous glass article of claim 5 which has been shrunk by 5 to 20 percent of its original volume.
Claim 10
Dependent Claim
116 words
A strong, thermally stable, microporous glass article having a pore volume of between 0.4 to 0.7 cubic centimeters per gram, pore size diameters ranging from 50 to 2,000 Angstrom units, and a surface area of at least 25 square meters per gram, comprising: a. at least 96 percent by weight SiO2, b. less than 4 percent by weight B2O3, c. less than 0.05 percent by weight alkali metal oxide, and d. less than 0.4 percent by weight Al2O3; said microporous glass article having a crush strength of at least 15 pounds per square inch gauge, and undergoing less than 25 percent volume shrinkage when the article is subjected to a temperature of 980*C. for 24 hours.
Claim 11
Dependent Claim
116 words
A strong, thermally stable, microporous glass article having a pore volume of between 0.4 to 0.7 cubic centimeters per gram, pore size diameters ranging from 50 to 2,000 Angstrom units, and a surface area of at least 25 square meters per gram, comprising: a. at least 96 percent by weight SiO2, b. less than 4 percent by weight B2O3, c. less than 0.05 percent by weight alkali metal oxide, and d. less than 0.4 percent by weight Al2O3; said microporous glass article having a crush strength of at least 15 pounds per square inch gauge, and undergoing less than 25 percent volume shrinkage when the article is subjected to a temperature of 980*C. for 24 hours.
Claim 12
Dependent Claim
20 words
The porous glass article of claim 8 which has a pore size diameter ranging from 50 to 1,000 Angstrom units.
Claim 13
Dependent Claim
20 words
The porous glass article of claim 8 which has a pore size diameter ranging from 50 to 200 Angstrom units.
Claim 14
Dependent Claim
20 words
The porous glass article of claim 8 which has a pore size diameter ranging from 600 to 1,000 Angstrom units.
Claim 15
Dependent Claim
55 words
The microporous glass article of claim 10 which has been shrunk by 5 to 20 percent of its original volume which has a crush strength of at least 30 pounds per square inch gauge and undergoes less than 10 percent volume shrinkage when a particle is subjected to a temperature of 980*C. for 24 hours.
Claim 16
Dependent Claim
53 words
The microporous glass acticle of claim 11 which has been shrunk to 5 to 20 percent of its original volume which has a crush strength of at least 25 pounds per square inch gauge and undergoes less than a 5 percent volume shrinkage when the particle is subjected to 980*C. for 24 hours.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |