Three-way catalyst

A three-way catalyst and oxide coating technology, applied in the direction of heterogeneous catalyst chemical elements, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of catalyst activity decline, Achieve the effects of inhibiting migration, avoiding alloying, and improving high temperature aging resistance

Active Publication Date: 2017-06-09
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even with a double-coated structure in which Pd and Rh are separated, at high temperature (such as 900-1050°C), part of Rh still migrates to the lower layer and interacts with Pd to reduce the catalyst activity.

Method used

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  • Three-way catalyst

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Effect test

Embodiment 1

[0018] A three-way catalyst, including a honeycomb carrier with a specification of Ф101.6mm×123.3mm, a pore density of 600cpsi, a pore wall thickness of 4.3mil, and a volume of 1.0L; a lower layer of coating is attached to the honeycomb carrier, the lower layer The coating amount of the coating is 101g / L, Pd is loaded on the lower coating layer, and Pd is loaded on the cerium-zirconium solid solution, and the Pd content is 28.3g / ft 3 ; Adhere to the middle Rh coating on the lower coating, the coating amount of the middle Rh coating is 100g / L, and the content of Rh is 2.83g / ft 3 ; Attach an upper alkaline earth metal oxide coating on the middle Rh coating, the coating amount is 5g / L, and the alkaline earth metal oxide is BaO.

[0019] The preparation method of described three-way catalyst adopts the following processing steps:

[0020] (1) The coating process of the lower Pd coating: the cerium-zirconium solid solution (30wt%CeO 2 , 60wt% ZrO 2 , 5wt% La 2 o 3 and 5 wt% Y ...

Embodiment 2

[0025] A three-way catalyst, including a honeycomb carrier with a specification of Ф101.6mm×123.3mm, a pore density of 600cpsi, a pore wall thickness of 4.3mil, and a volume of 1.0L; a lower layer of coating is attached to the honeycomb carrier, the lower layer The coating amount of the coating is 101g / L, Pd is loaded on the lower coating layer, and Pd is loaded on the cerium-zirconium solid solution, and the Pd content is 28.3g / ft 3 ; Adhere to the middle Rh coating on the lower coating, the coating amount of the middle Rh coating is 100g / L, and the content of Rh is 2.83g / ft 3 ; Attach an upper alkaline earth metal oxide coating on the middle Rh coating, and the alkaline earth metal oxide is 2.5g / L of BaO and 2.5g / L of SrO.

[0026] The preparation method of described three-way catalyst adopts the following processing steps:

[0027] (1) The coating process of the lower Pd coating: the cerium-zirconium solid solution (30wt%CeO 2 , 60wt% ZrO 2 , 5wt% La 2 o 3 and 5 wt% Y ...

Embodiment 3

[0032] A three-way catalyst, including a honeycomb carrier with a specification of Ф101.6mm×123.3mm, a pore density of 600cpsi, a pore wall thickness of 4.3mil, and a volume of 1.0L; a lower layer of coating is attached to the honeycomb carrier, the lower layer The coating amount of the coating is 101g / L, Pd is loaded on the lower coating layer, and Pd is loaded on the cerium-zirconium solid solution, and the Pd content is 28.3g / ft 3 ; Adhere to the middle Rh coating on the lower coating, the coating amount of the middle Rh coating is 100g / L, and the content of Rh is 2.83g / ft 3 ; Attach an upper alkaline earth metal oxide coating on the middle Rh coating, and the alkaline earth metal oxide is BaO of 10g / L.

[0033] The preparation method of described three-way catalyst adopts the following processing steps:

[0034] (1) The coating process of the lower Pd coating: the cerium-zirconium solid solution (30wt%CeO 2 , 60wt% ZrO 2 , 5wt% La 2 o 3 and 5 wt% Y 2 o 3 ), 50g of L...

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Abstract

The invention relates to a three-way catalyst, and belongs to the technical field of catalyst preparation. According to the three-way catalyst, a lower Pd coating is adhered to a honeycomb-shaped carrier; a middle Rh coating is adhered to the lower Pd coating; a solonetz metal oxide coating free of precious metal is adhered to the middle Rh coating; the solonetz metal oxide coating comprises one or more oxides of MgO, BaO, SrO and CaO; the mass ratio of the middle Rh coating to the solonetz metal oxide coating ranges from (10:1) to (30:1). After high-temperature aging, the three-way catalyst provided by the invention has relatively good treatment capability upon carbon monoxide, hydrocarbon and oxynitride.

Description

technical field [0001] The invention relates to a three-way catalyst, in particular to a three-way catalyst used for gasoline vehicle tail gas purification, and belongs to the technical field of catalyst preparation. Background technique [0002] The main pollutants of automobile exhaust are carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx). The catalyst installed in the exhaust system can oxidize carbon monoxide and hydrocarbons into carbon dioxide (CO 2 ), water (H 2 O), and at the same time reduce nitrogen oxides to nitrogen (N 2 ), to achieve the purification of exhaust gas, this catalyst is usually called a three-way catalyst. The three-way catalyst consists of two parts: a honeycomb ceramic or metal carrier, and a catalyst coating attached to the carrier. The catalyst coating is usually composed of an oxide material (such as alumina) with a large specific surface area, an oxygen storage material, and a noble metal active component (usually Pd (pallad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01D53/94B01D53/56B01D53/62B01D53/72
CPCB01D53/945B01D2258/01B01J23/002B01J23/63B01J35/04B01J2523/00B01J2523/3712B01J2523/48B01J2523/74B01J2523/36B01J2523/31B01J2523/25B01J2523/24Y02A50/20Y02T10/12
Inventor 岳军贾莉伟王卫东李晓坤赵德鹏于鹏飞浦琦伟王家明
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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