US5238897A
Expired / Lapsed
US
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Catalyst for molecular catalytic cracking of heavy hydrocarbons at ambient temperatures, and method of making the same
Assignee: NORTH CAROLINA CENTER FOR SCIENTIFIC RESEARCH Inc A CORP OF
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Filing: 1991-09-27
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Granted: 1993-08-24
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Expires: 2011-09-27
Abstract
Abstract A surface modified catalyst of the type comprising at least two mechanically mixed elements forming active catalyst sites at the boundaries of such elements. The surface-modified catalyst is formed by irradiating a catalyst compound, which is preferably hopcalite (copper-manganese), at an energy level sufficient to cause molecular dispersion of the copper molecules and increase the number of active sites. One or more additional elements may be added to the surface-modified catalyst, e.g. lithium and yttrium, to affect the reaction properties and temperature stability.
Inventors
- 👤 James H. Cornwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:30
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/34; B01J37/341; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8668; B01D53/8678; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/889; B01J23/8892; Y; Y10; Y10S; Y10S502/00; Y10S502/522
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
69 words
A method of making a surface-modified catalyst comprising the steps of: providing a catalyst compound composed of at least two mechanically mixed elements of the type forming active catalyst sites at the boundaries of such elements, wherein said catalyst compound comprises hopcalite; and irradiating said compound at an energy level sufficient to cause molecular dispersion of at least one of the elements and increase the number of active sites.
Claim 2
Independent Claim
69 words
A method of making a surface-modified catalyst comprising the steps of: providing a catalyst compound composed of at least two mechanically mixed elements of the type forming active catalyst sites at the boundaries of such elements, wherein said catalyst compound comprises hopcalite; and irradiating said compound at an energy level sufficient to cause molecular dispersion of at least one of the elements and increase the number of active sites.
Claim 3
Dependent Claim
15 words
A method according to claim 1, comprising the step of adding lithium prior to irradiation.
Claim 4
Dependent Claim
21 words
A method according to claim 2, wherein lithium is added prior to irradiation in an amount of about 15% by weight.
Claim 5
Dependent Claim
14 words
A method according to claim 2, comprising the step of adding yttrium after irradiation.
Claim 6
Dependent Claim
14 words
A method according to claim 3, comprising the step of adding yttrium after irradiation.
Claim 7
Dependent Claim
21 words
A method according to claim 5, wherein yttrium is added prior to irradiation in an amount of about 3% by weight.
Claim 8
Dependent Claim
17 words
A surface-modified catalyst made according to the method of claim 1, 2, 3, 4, 5, or 6.
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) | 1996-08-23 | 1997-02-22 | 1997-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-23 | 2001-02-22 | 2001-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-23 | 2005-02-22 | 2005-08-24 | $7700.00 | Window Closed / Lapsed |