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US5139994A Expired / Lapsed US ⏱️ 0.0 years remaining

Low temperature light-off platinum catalyst

Assignee: University of Michigan (System)
•
Filing: 1990-11-28
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Granted: 1992-08-18
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Expires: 2010-11-28
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Abstract

Abstract A method of making an oxidation catalyst for use in automotive exhaust gas treatment by impregnating with platinum a mechanical carrier having a support comprised substantially of alumina to produce a composite having, by weight, 1-5% platinum, and impregnating (by incipient wetness) the composite with an organo-titanium compound (titanium butoxide) and decomposing such compound to form a discontinuous titanium oxide phase on or adjacent the exposed portions of the composite. A method of treating automotive exhaust gases carrying hydrocarbons is also disclosed, comprising initiating combustion in an internal combustion engine fueled with fossil fuel, placing an oxidation catalyst at a location in close proximity to the source of such emissions, and exposing at such location the exhaust gases to a catalyst consisting of an Al 2 O 3 substrate, a continuous coating of platinum in an amount of 0.1-5% by weight, and a complexing discontinuous phase of titania thereover in an amount of 0.1-2.5%.

Inventors

  • 👤 Mohinder S. Chattha
  • 👤 William L. H. Watkins
  • 👤 Somasundaram Subramanian

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 23:55
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/42; B01J37/00; B01J37/02; B01J37/0201; B01J37/0205; B01J37/08; B01J37/082; B01J37/086

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 82 words
A method of making an oxidation catalyst for use in automotive gas treatment, comprising: (a) impregnating with platinum a mechanical carrier having a support comprised substantially of alumina to produce a composite having, by weight, 0.1-5.0% platinum; and (b) impregnating the composite with an organo-titanium compound and decomposing such compound to form a discontinuous TiO 2 phase on or adjacent the exposed portions of the composite, said TiO 2 being present in an amount of 0.1-8.0% by weight of the total catalyst.
Claim 2
Independent Claim 82 words
A method of making an oxidation catalyst for use in automotive gas treatment, comprising: (a) impregnating with platinum a mechanical carrier having a support comprised substantially of alumina to produce a composite having, by weight, 0.1-5.0% platinum; and (b) impregnating the composite with an organo-titanium compound and decomposing such compound to form a discontinuous TiO 2 phase on or adjacent the exposed portions of the composite, said TiO 2 being present in an amount of 0.1-8.0% by weight of the total catalyst.
Claim 3
Independent Claim 72 words
A method of making a hydrocarbon conversion catalyst for use in automotive exhaust gas treatment, comprising: (a) preparing a residue by incipiently wetting alumina with chloroplatinic acid in ethanol; (b) coating said residue with titanium butoxide carried in an organic solvent, said butoxide being present in an amount required to deposit TiO 2 discontinuously in an amount of 0.1-8.0% by weight of the catalyst; and (c) drying and calcining said coated residue.
Claim 4
Independent Claim 72 words
A method of making a hydrocarbon conversion catalyst for use in automotive exhaust gas treatment, comprising: (a) preparing a residue by incipiently wetting alumina with chloroplatinic acid in ethanol; (b) coating said residue with titanium butoxide carried in an organic solvent, said butoxide being present in an amount required to deposit TiO 2 discontinuously in an amount of 0.1-8.0% by weight of the catalyst; and (c) drying and calcining said coated residue.
Claim 5
Dependent Claim 26 words
The method as in claim 2, in which incipiently wetting means use of an impregnation solution in a volume just sufficient to wet said alumina completely.
Claim 6
Dependent Claim 23 words
The method as in claim 2, in which the ratio of titanium butoxide to chloroplatinic acid is in the range of 0.02-150 gm/gm.
Claim 7
Dependent Claim 20 words
The method as in claim 2, in which said alumina is sized in the particle range of 5-5×10 5 nm.
Claim 8
Dependent Claim 42 words
The method as in claim 2, in which drying is carried out by heating to a range of up to 100° C., and said calcining is carried out in a range of 400-600° C. for a period of at least four hours.

References Cited (Backward Citations)

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1995-08-18 1996-02-17 1996-08-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1999-08-18 2000-02-17 2000-08-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2003-08-18 2004-02-17 2004-08-18 $7700.00 Window Closed / Lapsed

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