Layered catalytic article and method of manufacturing the catalytic article
A product and layered technology, applied in the field of layered catalytic products, can solve the problems of complex method, easy sintering of platinum, and limitation of platinum use.
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example 1
[0101] Examples 1A-H: Preparation of various powder catalysts with 2% by weight of Pt / Pd (Pt / Pd = 2 / 1 ) on different support materials.
[0102] The compositions of the support materials are listed in Table 1. 1.33 wt% Pt and 0.67 wt% Pd were sequentially deposited onto the support by the incipient wetness impregnation technique using platinum-amine complexes and palladium nitrate as PGM precursors. The impregnated wet powder was dried at 120°C and then calcined at 550°C in air for 2 hours.
[0103] Table 1: Compositions of powdered carrier materials of Examples 1A-H
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example 2
[0106] Example 2: Aging and testing of the catalysts of Examples 1A-H.
[0107] The Pt / Pd deposited powder catalysts of Examples 1A-H were individually dispersed in deionized water to obtain a solids percentage of approximately 30%. The obtained slurry was ground and then dried while stirring. The dried slurry was calcined at 550 °C for 1 hour. The resulting powdered catalyst was crushed and sieved to collect 250-500 μm sized particles for testing on a high throughput reactor.
[0108] Aging was performed at 980° C. for 5 hours in the presence of 10% steam under cycling lean / rich conditions. The lean / rich aging cycle consisted of 5 minutes of air, 5 minutes of N 2 , 4% H for 5 minutes 2 and a margin of N 2 , and a 5-minute N 2 . This cycle is repeated until the desired aging duration is reached.
[0109] Catalytic performance was evaluated on a high throughput reactor with a shaken feed of a second lean gas and a second rich gas at λ = 1.000 + / - 0.025. When λ=1.025, t...
example 3
[0111] Example 3: PGM loading is 80g / ft 3 Preparation of reference Pd / Rh catalytic articles of (Pt / Pd / Rh = 0 / 76 / 4).
[0112] The two-layer washcoat structure was coated on a cylindrical monolithic cordierite substrate sized 4.66" in diameter, 3.58" in length, with a cell density of 600 cpsi and a wall thickness of 3.5 mils. The detailed procedure is provided below:
[0113] Preparation of base coat: 38g / ft of palladium nitrate form 3 Pd (50% by weight of total Pd) was impregnated onto refractory alumina and 38 g / ft of palladium nitrate 3 Pd (50% by weight of total Pd) was impregnated onto a stabilized ceria-zirconia composite containing about 40% by weight ceria. will contain about 35.2% by weight of refractory Al 2 o 3 , 49.6% by weight of stabilized ceria-zirconia composite, barium acetate yielding 11.6% by weight of BaO, yielding 1.9% by weight of ZrO 2 A slurry of zirconium acetate and 1.7 wt% Pd was coated onto the substrate. After calcination in air at 550°C for 1...
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