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Method for measuring oxygen storage capacity of automotive exhaust purification three-way catalyst

A three-way catalyst, automobile exhaust technology, applied in the direction of measuring the acceleration and deceleration rate of fluid, using liquid/vacuum for liquid tightness measurement, and using combustion for chemical analysis, etc. Effectively guide the research of three-way catalysts and other issues to achieve the effects of low test cost, high test efficiency and accurate test results

Active Publication Date: 2017-09-19
昆明贵研催化剂有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a big difference between the oxygen storage capacity of three-way catalytic materials and three-way catalysts, so that the oxygen storage capacity of catalytic materials cannot directly reflect the quality of catalysts, so it cannot effectively guide the research of three-way catalysts.

Method used

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  • Method for measuring oxygen storage capacity of automotive exhaust purification three-way catalyst
  • Method for measuring oxygen storage capacity of automotive exhaust purification three-way catalyst
  • Method for measuring oxygen storage capacity of automotive exhaust purification three-way catalyst

Examples

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Comparison scheme
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Embodiment 1

[0073] Example 1 Select a fresh catalyst sample to test the oxygen storage capacity. The diameter of the catalyst sample is 26.6mm, the length is 77.0mm, the volume is 42.79mL, and the space velocity is 40000h -1 , the test temperature is 550°C, and the reaction gas is switched abruptly according to the lean / rich conditions described in the content of the invention. The switching times are 4 times, switching once every 80s. The definite integral values ​​are 23.0079s, 23.0023s, 23.0082s, 23.0123s respectively, and the detection value of α is 0.361%, so the calculation formula of oxygen storage capacity The definite integral values ​​are 5.8721s, 5.8777s, 5.8718s, 5.8677s respectively, and the average value is 5.8323s.

[0074] Then OSC=0.00397×40000×5.8323=926.17mg / L cat. .

[0075] The bench test result of the catalyst under the same temperature conditions is 945.13mg / L cat. , it can be seen that the test result of the present invention relates to the oxygen storage test...

Embodiment 2

[0076] Example 2 Select the aging catalyst sample to test the oxygen storage capacity. The diameter of the catalyst sample is 26.5mm, the length is 70.3mm, the volume is 38.77mL, and the space velocity is 40000h -1 , the test temperature is 550°C, and the reaction gas is switched abruptly according to the lean-burn / rich-burn conditions described in the content of the invention. The switching times are 4 times, switching once every 50s. The definite integral values ​​are 16.9007s, 16.8686s, 16.8417s, 16.8328s respectively, and the detection value of α is 0.355%, so in the calculation formula of oxygen storage The definite integral values ​​are 0.8493s, 0.8814s, 9083s, 0.9118s respectively, and the average value is 0.8802s.

[0077] Then OSC=0.00397×40000×0.8802=139.78mg / L cat ..

[0078] The bench test cannot obtain the oxygen storage value of the aging catalyst, indicating that the testable lower limit of the oxygen storage test method of the present invention is low.

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Abstract

The invention discloses a method for measuring the oxygen storage capacity of an automotive exhaust purification three-way catalyst. The method is a method for measuring the oxygen storage capacity of the automotive exhaust purification three-way catalyst through a multifunctional catalytic performance evaluation device and can accurately measure the oxygen storage capacity of the catalyst through simple reaction gas distribution. The method is simple, fast, accurate, low in measuring cost, high in repeatability and the like and can solve the problem that engine rack oxygen storage capacity measuring is poor in repeatability and high in cost. The method includes the steps of a, sampling a sample; b, calibrating a gas detecting instrument; c, preprocessing the sample; d, measuring the oxygen storage capacity, wherein abrupt switching between reaction gas distribution lean burn / rich burn conditions is performed, and switching times is not less than 4 times.

Description

technical field [0001] The invention relates to a performance evaluation test method of a three-way catalyst for automobile tail gas purification, in particular to a method for testing the oxygen storage capacity of a three-way catalyst for car tail gas purification on a multifunctional catalytic performance evaluation device. Background technique [0002] With the increasingly stringent regulations on vehicle exhaust emissions, catalytic converters have become one of the most effective technical countermeasures to control the emissions of exhaust pollutants such as hydrocarbons (HC), nitrogen oxides (NOx) and carbon monoxide (CO). An essential component for pollutant emissions, installed in the exhaust system of a car. The three-way catalyst is the core component of the gasoline vehicle exhaust catalytic converter. Its oxygen storage capacity or the total oxygen storage capacity determines the purification effect of the catalytic converter on the HC and CO pollutants of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/12G01N1/04G01M3/26
Inventor 王成雄赵云昆夏文正杨冬霞杜君臣郭律冯丰
Owner 昆明贵研催化剂有限责任公司