Catalysts for lean burn engines
First Claim
1. A method for the conversion of CO in an exhaust stream, comprising:
- contacting an exhaust stream containing CO with a catalyst, the catalyst made from the addition of a Sn compound is a ternary composition comprising Sn, Ti and Zr, wherein the ternary composition comprises Sn(a)Ti(b)Zr(c)O2, wherein a is 0.25, b is 0.25 and c is 0.5.
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Abstract
Embodiments of the present disclosure include a catalyst for the conversion of CO and/or hydrocarbons in an exhaust stream including a Sn compound selected from the group consisting of a binary composition comprising Sn and Ti, a ternary composition comprising Sn, Ti and Zr, and mixtures of any thereof. In those embodiments, the binary composition may include Sn(X)Ti(y)O2, wherein x+y=1, 0.85>y>0. In other embodiments of the present disclosure, the Sn compound includes a ternary composition including Sn(a)Ti(b)Zr(c)O2, wherein a is 0.25, b is 0.25 and c is 0.5. Certain embodiments of this disclosure include a method for the conversion of CO in an exhaust stream, including contacting an exhaust stream containing CO with the catalyst described above containing a Sn compound. In other embodiments, the exhaust stream includes hydrocarbons.
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Citations
19 Claims
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1. A method for the conversion of CO in an exhaust stream, comprising:
- contacting an exhaust stream containing CO with a catalyst, the catalyst made from the addition of a Sn compound is a ternary composition comprising Sn, Ti and Zr, wherein the ternary composition comprises Sn(a)Ti(b)Zr(c)O2, wherein a is 0.25, b is 0.25 and c is 0.5.
- View Dependent Claims (2)
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3. A method for the conversion of CO in an exhaust stream, comprising:
- contacting an exhaust stream containing CO with a catalyst, the catalyst comprising a Sn compound selected from the group consisting of a binary composition comprising Sn and Ti, and a ternary composition comprising Sn, Ti and Zr, and mixtures of any thereof, wherein the Sn compound comprises a composition defined by a region of a phase diagram between Zr0.5Sn0.25Ti0.25O2 and, Sn1-xTixO2, where x is greater than or equal to 0 and less than 0.85;
the catalyst further comprising a catalyst component selected from the group consisting of Pt, Pd, one or more base metals, and combinations of any thereof, wherein the base metal is selected from the group consisting of Cu, Fe, Ni, W, V, Cr, Mn, Co, and mixtures of any thereof. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- contacting an exhaust stream containing CO with a catalyst, the catalyst comprising a Sn compound selected from the group consisting of a binary composition comprising Sn and Ti, and a ternary composition comprising Sn, Ti and Zr, and mixtures of any thereof, wherein the Sn compound comprises a composition defined by a region of a phase diagram between Zr0.5Sn0.25Ti0.25O2 and, Sn1-xTixO2, where x is greater than or equal to 0 and less than 0.85;
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15. A method for the conversion of CO in an exhaust stream, comprising:
- contacting an exhaust stream containing CO with a catalyst, the catalyst comprising a Sn compound selected from the group consisting of a binary composition comprising Sn and Ti, and a ternary composition comprising Sn, Ti and Zr, and mixtures of any thereof, the catalyst further comprising a component selected from the group consisting of Pt, Pd, one or more base metals, and combinations of any thereof, wherein the base metal is selected from the group consisting of Cu, Fe, Ni, W, V, Cr, Mn, Co, and mixtures of any thereof.
- View Dependent Claims (16, 17)
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18. A method for the conversion of CO in an exhaust stream, comprising:
- contacting an exhaust stream containing CO with a catalyst, the catalyst comprising a Sn compound selected from the group consisting of a binary composition comprising Sn and Ti, and a ternary composition comprising Sn, Ti and Zr, and mixtures of any thereof, wherein the catalyst further comprises a zeolite.
- View Dependent Claims (19)
Specification