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Preparation method of high temperature stable monolithic catalyst for purifying tail gas of automobile

A monolithic catalyst and automobile exhaust technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problem of aggravating the growth, sintering and aggregation of noble metal active components and cerium oxide grains, and the specific surface area of ​​catalysts decrease in catalyst activity, etc., to achieve the effect of improving the coating process, good fluidity, and high temperature resistance

Active Publication Date: 2014-08-13
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During use, long-term exposure to a heat environment will lead to a decrease in catalyst activity
Al in coating material 2 o 3 Phase change and microporous sintering will occur, and the specific surface area of ​​the catalyst will drop sharply, which will intensify the growth, sintering and aggregation of the noble metal active component and additive cerium oxide grains, resulting in a decline in catalyst performance

Method used

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  • Preparation method of high temperature stable monolithic catalyst for purifying tail gas of automobile
  • Preparation method of high temperature stable monolithic catalyst for purifying tail gas of automobile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Pd(NO 3 ) 2 Aqueous solution (Pd accounts for 0.8% of dry coating mass), cerium nitrate, nickel nitrate and manganese nitrate (mixed oxide accounts for 5% of dry coating mass) joins 120g deionized water, forms solution (I) after stirring for 10 minutes ; add 50g La-Al 2 o 3 , stirred for 6h; under stirring, add 5g of pseudoboehmite and 10g of cerium-zirconium solid solution, add 5mL of concentrated nitric acid, adjust the pH to 3-4, and continue stirring for 1 hour; coat the slurry on the cordierite honeycomb ceramic carrier under vacuum (The size is 15mm×30mm, the volume is 5.3mL); dry at room temperature for 12 hours, dry at 120°C for 12 hours, and roast in air at 500°C for 3 hours to obtain fresh catalyst 1#; obtain aged catalyst after roasting at 1000°C for 4 hours , their three-way catalytic activity (T 50 , reaction temperature when conversion rate is 50%) see Table 2.

Embodiment 2

[0018] In the process of [Example 1] preparing the slurry, add 1g (a mixture of Polyethylene Glycol-200 and Tween-80) surfactant in solution (I), and other conditions are the same as [Example 1]. Get fresh catalyst 2#.

Embodiment 3

[0020] [Example 1] In the process of preparing the slurry, add 3g (a mixture of polyethylene glycol-200 and Tween-80) surfactant in the solution (I), and other conditions are the same as [Example 1]. Get fresh catalyst 3#.

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Abstract

The invention discloses a preparation method of a high temperature stable monolithic three-way catalyst for purifying tail gas of an automobile, comprising the steps of preparing a coating slurry including active components of a catalyst, cocatalyst, oxygen storage material and active alumina, etc. and coating the slurry on a cordierite honeycomb ceramic carrier. The method is characterized by adding proper amounts of composite surfactant (Tween-80, Span-20 and polyethylene glycol-200) in the preparation of the coating slurry, so that the performance of the slurry and the whole coating process are obviously improved. The monolithic three-way catalyst prepared by the invention has excellent activity and stability after aging at high temperature (e.g.1000 DEG C), and the process is simple, the preparation cost of the invention is lower than that of the prior art, and the invention is very suitable for industrial production.

Description

1. Technical field [0001] The invention relates to a method for preparing a high-temperature stable integral automobile exhaust gas purification catalyst, which is characterized in that when preparing the coating slurry of the catalyst, an appropriate amount of composite surfactant is added, thereby significantly improving the performance and performance of the slurry. The whole coating process enables the prepared monolithic three-way catalyst to still have excellent activity and stability after being aged at a high temperature (such as 1000° C.). 2. Technical Background [0002] In recent years, with the rapid development of urban construction and transportation, the pollution of urban air by vehicle exhaust has become increasingly serious. Three-way catalysts are widely used in the control of automobile exhaust to reduce CO, HC and NOx emissions. During use, long-term exposure to a heat environment will result in reduced catalyst activity. Al in coating material 2 o 3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01D53/94B01D53/56B01D53/62B01D53/72
Inventor 卢冠忠任宇涛张志刚郭耘郭杨龙王筠松詹望成王艳芹龚学庆
Owner EAST CHINA UNIV OF SCI & TECH
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