Radial gradient load three-way catalyst and preparation method

A three-way catalyst, radial gradient technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. The effect of dosage reduction

Inactive Publication Date: 2013-06-19
SHANGHAI YUNHUI ENVIRONMENTAL PROTECTION SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The three-way catalyst is installed in the catalytic converter of the exhaust system. The catalytic converter is on its expansion pipe section. Due to the diffusion of the air flow, the air flow in the catalytic converter is unevenly distributed.
[0004] Although the above-mentioned device can make the air f

Method used

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  • Radial gradient load three-way catalyst and preparation method
  • Radial gradient load three-way catalyst and preparation method
  • Radial gradient load three-way catalyst and preparation method

Examples

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Embodiment 1

[0031] This example is used to illustrate the preparation of the catalyst of the present invention. Weigh 695g of cerium-zirconium-aluminum composite oxide (55wt%γ-Al 2 o 3 , 13wt%CeO 2 , 16wt%ZrO 2 , 3.5wt%BaO, 11wt%MgO, 1.5wt%Pr 6 o 11 , based on the mass of cerium-zirconium-aluminum composite oxide), 0.65g Rh(NO 3 ) 3 , 4.43g Pd(NO 3 ) 3 Mix with 1291g deionized water to make a mixture with a solid content of 35wt%, adjust the pH value to 3 with nitric acid, and wet ball mill for 4 hours to make a slurry. Add 7 g of polyvinyl alcohol solution and stir evenly, and use a catalyst radial gradient coating apparatus to load the slurry on the surface of the cylindrical cordierite honeycomb ceramic carrier in a radial gradient distribution. Taking the evenly loaded three-way catalyst loading as a benchmark, the coating material loading of the first zone 10 is the loading of the uniformly loading three-way catalyst (the loading of the coating material of the evenly loading...

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Abstract

The invention discloses a radial gradient load three-way catalyst and a preparation method, the catalyst comprises a carrier with a regular structure and a coating material attached on the surface of the carrier, the coating material presents gradient load along the radial direction of the carrier with the regular structure, and the load is gradually reduced from an axis area to a marginal area of the carrier. Compared with the uniformly loaded three-way catalyst, the provided catalyst can reduce the amount of the coating material by 5-15wt%, and the catalytic activity is equal.

Description

technical field [0001] The invention relates to the field of catalytic purification of automobile exhaust gas, in particular to a three-way catalyst for automobile exhaust gas purification with a coating material gradient load along the radial direction and a preparation method thereof. Background technique [0002] Vehicle emissions mainly include carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NO x ), which seriously pollutes the atmosphere. Especially NO x Generation of photochemical smog and NO with HC under UV irradiation x The formation of acid rain will cause serious damage to the ecological environment. At present, three-way catalysts are mainly used to reduce the pollutants CO, HC and NO emitted by automobiles. x into harmless nitrogen and water. The three-way catalyst is installed in the catalytic converter of the exhaust system. The catalytic converter is on its expansion pipe section. Due to the diffusion of the air flow, the air flow in the cataly...

Claims

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Application Information

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IPC IPC(8): B01J35/10B01J37/02B01J31/38B01D53/94
CPCY02T10/12
Inventor 周建华
Owner SHANGHAI YUNHUI ENVIRONMENTAL PROTECTION SCI & TECH CO LTD
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