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Patent US3887740A successfully refreshed from Google Patents.
US3887740A
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US
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Process for depositing oxide coatings
Assignee: Corning Glass Works
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Filing: 1972-05-01
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Granted: 1975-06-03
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Expires: 1992-05-01
Abstract
Abstract A process for depositing uniform, pure, high-surface-area metal oxide coatings on porous support structures is disclosed. The process comprises the impregnation of the support structure with an aqueous ionic solution of a selected metal followed by treatment of the impregnated support structure with ammonia or ammonia alkaline solutions to cause the in situ precipitation on the support structure of a hydrated metal oxide coating. Such metal oxide coatings are useful as catalysts or catalyst supports.
Inventors
- 👤 Gordon F Foster
- 👤 Helmuth E Meissner
- 👤 Janice L Stiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:51
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/03; B01J37/031; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01J35/00; B01J35/50; B01J35/56; B01J35/57
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
128 words
A PROCESS FOR PROVIDING A CATALYST ON A UNIFORM, TIGHTLYADHERENT, HIGH-SURFACE-AREA OXIDE CATALYST SUPPORT COATIING DEPOSITED ON THE POROUS INTERIOR CHANNEL WALLS OF A REFRACTORY MONOLITHIC SUPPORT STRUCTURE OF THE HONEYCOMB TYPE WHICH COMPRISES: A. IMPREGNATING THE POROUS INTERIOR CHANNEL WALLS OF THE SUPPORT STRUCTURE WITH AN AQUEOUS IONIC SOLUTION OF AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, TITANIUM, TIN, ZIRCONIUM, THORIUM, CHROMIUM, MANGANESE, IRON, GALLIUM, NIOBIUM, MAGNESIUM, TANTALUM, AND HAFNIUM; B. CONTACTING THE THUS-IMPREGNATED POROUS SUPPORT STRUCTURE WITH AMMONIA OR AN AQUEOUS AMMONIA ALKALINE SOLUTION TO CAUSE THE IN SITU PRECIPITATION ON THE SUPPORT STRUCTURE OF A UNIFORM, TIGHTLY-ADHERENT, HIGH-SURFACE AREA COATING CONSISTING ESSENTIALLY OF THE HYDRATED OXIDE OF THE SELECTED METALS; AND C. DEPOSITING A NOBLE METAL CATALYST ON THE HIGH-SURFACE-A COATING.
Claim 2
Dependent Claim
128 words
A PROCESS FOR PROVIDING A CATALYST ON A UNIFORM, TIGHTLYADHERENT, HIGH-SURFACE-AREA OXIDE CATALYST SUPPORT COATIING DEPOSITED ON THE POROUS INTERIOR CHANNEL WALLS OF A REFRACTORY MONOLITHIC SUPPORT STRUCTURE OF THE HONEYCOMB TYPE WHICH COMPRISES: A. IMPREGNATING THE POROUS INTERIOR CHANNEL WALLS OF THE SUPPORT STRUCTURE WITH AN AQUEOUS IONIC SOLUTION OF AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, TITANIUM, TIN, ZIRCONIUM, THORIUM, CHROMIUM, MANGANESE, IRON, GALLIUM, NIOBIUM, MAGNESIUM, TANTALUM, AND HAFNIUM; B. CONTACTING THE THUS-IMPREGNATED POROUS SUPPORT STRUCTURE WITH AMMONIA OR AN AQUEOUS AMMONIA ALKALINE SOLUTION TO CAUSE THE IN SITU PRECIPITATION ON THE SUPPORT STRUCTURE OF A UNIFORM, TIGHTLY-ADHERENT, HIGH-SURFACE AREA COATING CONSISTING ESSENTIALLY OF THE HYDRATED OXIDE OF THE SELECTED METALS; AND C. DEPOSITING A NOBLE METAL CATALYST ON THE HIGH-SURFACE-A COATING.
Claim 3
Dependent Claim
127 words
A process for providing a catalyst on a uniform, tightly-adherent, high-surface-area oxide catalyst support coating deposited on the porous interior channel walls of a refractory monolithic support structure of the honeycomb type which comprises: a. impregnating the porous interior channel walls of the support structure with an aqueous ionic solution of at least one metal selected from the group consisting of aluminum, titanium, tin, zirconium, thorium, chromium, manganese, iron, gallium, niobium, magnesium, tantalum, and hafnium; b. contacting the thus-impregnated porous support structure with ammonia or an aqueous ammonia alkaline solution to cause the in situ precipitation on the support structure of a uniform, tightly-adherent, high-surface-area coating consisting essentially of the hydrated oxides of the selected metals; and c. depositing a noble metal catalyst on the high-surface-area coating.
Claim 4
Dependent Claim
127 words
A process for providing a catalyst on a uniform, tightly-adherent, high-surface-area oxide catalyst support coating deposited on the porous interior channel walls of a refractory monolithic support structure of the honeycomb type which comprises: a. impregnating the porous interior channel walls of the support structure with an aqueous ionic solution of at least one metal selected from the group consisting of aluminum, titanium, tin, zirconium, thorium, chromium, manganese, iron, gallium, niobium, magnesium, tantalum, and hafnium; b. contacting the thus-impregnated porous support structure with ammonia or an aqueous ammonia alkaline solution to cause the in situ precipitation on the support structure of a uniform, tightly-adherent, high-surface-area coating consisting essentially of the hydrated oxides of the selected metals; and c. depositing a noble metal catalyst on the high-surface-area coating.
Claim 5
Dependent Claim
32 words
A process according to claim 1 wherein the aqueous ionic solution is a concentrated aqueous solution of ionic compounds of the selected metals and has a pH value not exceeding about 7.
Claim 6
Dependent Claim
42 words
A process according to claim 2 wherein impregnating the porous interior channel walls of the support structure comprises immersing the support structure in the aqueous ionic solution for a period of time at least sufficient to thoroughly wet the porous surface thereof.
Claim 7
Dependent Claim
31 words
A process according to claim 3 wherein the aqueous ionic solution contaIns ionic compounds of metals selected from the group consisting of aluminum, titanium, tin, zirconium, thorium, chromium, manganese, and iron.
Claim 8
Dependent Claim
37 words
A process according to claim 4 wherein contacting the thus-impregnated porous support structure comprises contact with an aqueous ammonia alkaline solution of at least one compound selected from the group consisting of ammonium hydroxide and ammonium carbonate.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |