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- Nachgewiesen in: USPTO Patent Applications
- Sprachen: English
- Document Number: 20240017245
- Publication Date: January 18, 2024
- Appl. No: 18/255403
- Application Filed: November 22, 2021
- Claim: 1. A method for manufacturing NOx storage and reduction catalyst article, the method comprising: preparing a Ru slurry by dispersing a Ru metal particle powder having an average particle diameter in a range of 5 nm to 50 microns on a support selected from CeO2, ZrO2, Al2O3, TiO2, SiO2, and adding an accelerator selected from Ba, Sr, La, Ce, Zr, Mg, Rb, Ca, Mn, Fe, and Co precursors; milling the slurry so that the average particle diameter is 10 um or less; applying the slurry on a carrier; and drying and calcining the carrier coated with the slurry.
- Claim: 2. The method of claim 1, wherein the precursor is selected from hydroxides, carbonates, nitrates, or oxides of corresponding metals.
- Claim: 3. The method of claim 1, wherein a platinum group component selected from Pt, Pd, and Rh is supported on the support.
- Claim: 4. A method for manufacturing a NOx storage and reduction catalyst article, the method comprising: forming a first layer by dry or wet coating a Ru metal particle powder having an average particle diameter in a range of 5 nm to 50 microns on a carrier; preparing a second layer slurry by adding an accelerator selected from Ba, Sr, La, Ce, Zr, Mg, Rb, Ca, Mn, Fe, and Co precursors to a support selected from CeO2, ZrO2,Al2O3, TiO2, and SiO2 on which a platinum group component selected from Pt, Pd, and Rh is supported; forming a multi-layer by applying the second layer slurry on the first layer; and drying and calcining the multi-layer formed carrier.
- Claim: 5. A method for manufacturing a NOx storage and reduction catalyst article, the method comprising: synthesizing a heat-resistant ruthenium composite; preparing a Ru slurry by mixing the composite into a de-NOx washcoat; milling the slurry to have an average particle diameter of 10 um or less; applying the slurry onto a carrier; and drying and calcining the carrier coated with the slurry.
- Claim: 6. The method of claim 5, wherein synthesizing a heat-resistant ruthenium composite comprises mixing A-type alkali metal precursor composed of Ru metal powder or nano-particle powder (Ru/RuOx), Ba, La, Sr, Zr, and Ca, and B-type precursor composed of Mg, Fe, Mn, Ni, and Co, and heat treating in air.
- Claim: 7. The method of claim 6, further comprising an organic material selected from ethylene glycol, citric acid, or sucrose, or a reducing agent selected from NaBH4 or CaH2 before heat treating.
- Claim: 8. The method of claim 5, wherein synthesizing the heat-resistant ruthenium composite comprises mixing a Ru colloidal solution in which Ru metal powder is dispersed in poly(N-vinyl-2-pyrrolidone) with La and Sr oxides doped with Mg and Ni, and heat-treating.
- Claim: 9. The method of claim 5, wherein the de-NOx washcoat is formed by adding an accelerator selected from Ba, Sr, La, Ce, Zr, Mg, Rb, Ca precursors to a support selected from CeO2, ZrO2,Al2O3,TiO2, SiO2 on which a platinum group component selected from Pt, Pd, Rh is supported.
- Claim: 10. An internal combustion engine exhaust system wherein the manufactured NOx storage and reduction catalyst article of claim 1 is disposed in front of a selective catalytic reduction (SCR) catalyst article.
- Current International Class: 01; 01; 01; 01; 01; 01; 01; 01; 01; 01; 01; 01
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