Ternary catalyst for automobile tail gas treatment

A three-way catalyst, automobile exhaust technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of decreased catalyst activity, low reduction activity, etc., to improve catalytic ability, improve The effect of oxygen storage capacity and high nitrogen oxide conversion capacity

Inactive Publication Date: 2017-01-04
桐城市宇洁机动车尾气检测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high temperature and oxygen-enriched conditions, the Rh in the upper coating tends to migrate to the lower coating and interact with Pd, which reduces the activity of the catalyst.
In addition, the loading of Rh on the oxygen storage material can greatly improve the oxygen storage capaci

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: A three-way catalyst for automobile exhaust treatment, including a honeycomb carrier, with a specification of Ф118.4mm×152.4mm, a pore density of 600cpsi, a pore wall thickness of 4.3mil, and a volume of 1.678L; in the honeycomb The lower layer of Pd coating is attached on the carrier, the middle Pd coating is attached on the lower layer of Pd coating, and the upper layer of Rh coating is attached on the middle Pd coating; the lower layer of Pd coating includes Pd-loaded cerium-zirconium solid solution and La 2 o 3 Doped alumina (La 2 o 3 -Al 2 o 3 ), the intermediate Pd coating includes Pd-loaded La 2 o 3 -Al 2 o 3 and ZrO 2 , the upper Rh coating consists of Rh-loaded cerium-zirconium solid solution and La 2 o 3 -Al 2 o 3 ; The load of Pd in ​​the lower Pd coating is 18g / ft 3 , the loading of Pd in ​​the middle Pd coating is 18g / ft 3 , the Rh loading in the upper Rh coating is 4g / ft 3 ;

[0011] The preparation method of described three-way ...

Embodiment 2

[0015] Example 2: A three-way catalyst for automobile exhaust treatment, including a honeycomb carrier, with a specification of Ф118.4mm×152.4mm, a pore density of 600cpsi, a pore wall thickness of 4.3mil, and a volume of 1.678L; in the honeycomb The lower layer of Pd coating is attached on the carrier, the middle Pd coating is attached on the lower layer of Pd coating, and the upper layer of Rh coating is attached on the middle Pd coating; the lower layer of Pd coating includes Pd-loaded cerium-zirconium solid solution and La 2 o 3 Doped alumina (La 2 o 3 -Al 2 o 3 ), the intermediate Pd coating includes Pd-loaded La 2 o 3 -Al 2 o 3 and ZrO 2 , the upper Rh coating consists of Rh-loaded cerium-zirconium solid solution and La 2 o 3 -Al 2 o 3 ; The load of Pd in ​​the lower Pd coating is 15g / ft 3 , the loading of Pd in ​​the middle Pd coating is 5g / ft 3 , the Rh loading in the upper Rh coating is 0.1g / ft 3 ;

[0016] The preparation method of described three-way...

Embodiment 3

[0020] Example 3: A three-way catalyst for automobile exhaust treatment, including a honeycomb carrier, with a specification of Ф118.4mm×152.4mm, a pore density of 600cpsi, a pore wall thickness of 4.3mil, and a volume of 1.678L; in the honeycomb The lower layer of Pd coating is attached on the carrier, the middle Pd coating is attached on the lower layer of Pd coating, and the upper layer of Rh coating is attached on the middle Pd coating; the lower layer of Pd coating includes Pd-loaded cerium-zirconium solid solution and La 2 o 3 Doped alumina (La 2 o 3 -Al 2 o 3 ), the intermediate Pd coating includes Pd-loaded La 2 o 3 -Al 2 o 3 and ZrO 2 , the upper Rh coating consists of Rh-loaded cerium-zirconium solid solution and La 2 o 3 -Al 2 o 3 ; The load of Pd in ​​the lower Pd coating is 60g / ft 3 , the loading of Pd in ​​the middle Pd coating is 180g / ft 3 , the Rh loading in the upper Rh coating is 10g / ft 3 ;

[0021] The preparation method of described three-wa...

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Abstract

The invention relates to a ternary catalyst for automobile tail gas treatment. The ternary catalyst comprises a honeycomb substrate, and is characterized in that a lower Pd coating is adhered to the honeycomb substrate, a middle Pd coating is adhered to the lower Pd coating, and an upper Rh coating is adhered to the middle Pd coating; the lower Pd coating comprises a Pd-loaded cerium-zirconium solid solution and La2O3-doped aluminum oxide (La2O3-Al2O3); the middle Pd coating comprises Pd-loaded La2O3-Al2O3 and a bonding agent; the upper Rh coating comprises an Rh-loaded cerium-zirconium solid solution and La2O3-Al2O3. Since the middle Pd coating contains no CeO2 ingredient, and Pd is loaded on La2O3-Al2O3, so that the catalytic capability of the ternary catalyst is improved, and the oxygen storage capability of the ternary catalyst is improved; compared with a traditional Pd/Rh dual-coating ternary catalyst, the ternary catalyst provided by the invention has relatively high hydrocarbon compound, carbonic oxide and oxynitride treatment capacity, and especially has relatively high oxynitride conversion capacity.

Description

technical field [0001] The invention relates to a three-way catalyst used for the treatment of automobile tail gas, and belongs to the technical field of automobile tail gas purification. 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 kind of catalyst is usually called three-way catalyst. The three-way catalyst consists of two parts: a honeycomb ceramic or metal support, and a catalyst coating attached to the support. Catalyst coatings usually consist of oxide materials with large specific surface area (such as alumina), oxygen storage materials, and noble metal active components (usually Pt (platinum), Pd (palladium) dispersed on the ...

Claims

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Application Information

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IPC IPC(8): B01J35/04B01J23/63B01D53/94B01D53/56B01D53/62B01D53/44
CPCB01J23/002B01D53/945B01J23/63B01J35/04
Inventor 胡雪林
Owner 桐城市宇洁机动车尾气检测有限公司
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