Apparatus and process method for forcibly aging vehicle tail gas purification catalytic material

A technology of catalytic materials and process methods, which is applied in the field of devices for forced aging of catalytic materials for vehicle exhaust purification, and can solve problems such as lack of key parameter inspections or operating costs, affecting scientific research progress, and expensive problems

Inactive Publication Date: 2017-10-13
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

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Problems solved by technology

However, compared with the second type of bench test, due to the highly simplified exhaust conditions, even if it is considered that the complete transformation of carbon monoxide, residual hydrocarbons and nitrogen oxides can be considered to be acceptable, the comprehensive effect is still negligible. The fuel ratio conditions and the significant presence of gases such as water vapor and carbon dioxide are of concern (see the literature "AppliedCatalysisB: Environmental76(200(7)357")
[0008] To sum up

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  • Apparatus and process method for forcibly aging vehicle tail gas purification catalytic material

Examples

Experimental program
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Effect test

Embodiment 1

[0038] The sample of Comparative Example 1 was subjected to hydrothermal forced aging treatment changing the air-fuel ratio, and the treatment space velocity was 10000h- 1 , from room temperature to 1050°C at a temperature of 10°C / min. After treatment time is 10 hours. The exhaust gas composition in the first 5 hours is hot nitrogen containing 10% water vapor, 5% hydrogen and 0% carbon dioxide by volume. The exhaust gas composition in the next 5 hours It is hot air containing 10% water vapor by volume. The catalytic material is still in the aging furnace during the cooling process, and the dry air is used as a protective atmosphere. Chemical and physical properties of materials and catalytic evaluation results.

[0039] Based on the series of aging treatments of the present invention, the basic physical properties of cerium-zirconium rare earth catalytic materials and the comparison of catalytic activities are disclosed.

[0040] Comparative example 1 corresponds to the physi...

Embodiment 6

[0047] The sample of comparative example 4 is subjected to Duramax engine bench aging treatment, and the processing space speed is 15000h- 1 , to simulate the 100000km operating load, and select 1 / 3, 2 / 3 and full-time operating nodes corresponding to 4, 8, and 12-hour aging for investigation. Chemical and physical properties of materials and catalytic evaluation results.

Embodiment 2

[0049] The comparative example 4 sample is subjected to hydrothermal forced aging treatment, and the processing space velocity is 15000h- 1 , the exhaust gas component is hot air containing 10% water vapor, 5% carbon dioxide and 0% hydrogen by volume, and the temperature is raised from room temperature to 800°C at 10°C / min for 4, 8, and 12 hours. The aging reaction tube was taken out and lowered to room temperature, during which dry air was used as a protective atmosphere. Chemical and physical properties of materials and catalytic evaluation results.

[0050] Phase composition analysis and comparison of catalytic activity of the barium-cerium-aluminum composite oxidation catalytic material based on the series of aging treatments of the present invention. Comparative example 4 corresponds to the physical and chemical properties of fresh barium-cerium-aluminum-based catalytic materials, and comparative examples 5 and 6 are the test results obtained from laboratory hydrothermal...

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Abstract

The invention relates to a device and a process method for forced aging of catalytic materials for vehicle tail gas purification. The process is to put a vehicle exhaust gas purification catalytic material into the aging reaction tube and heat it; the aged gas is passed into the bed of the catalytic material in the reactor and aged at 400-1300°C for 5-20 hours; the aging-treated catalytic material is completed Take out the test. The aging device mainly includes three parts: gas circuit, aging tube reactor, and temperature control components. The invention is used for life investigation and activity screening of a vehicle tail gas purification catalytic material containing at least a certain type of oxides corresponding to elements such as cerium, zirconium, aluminum, barium and the like. The test results are true and reliable, the operation process is simple, the operation risk is small, the repeatability is good, the project scale-up is easy to realize, and the treatment process has no highly toxic waste gas, waste liquid, and waste residue discharge, which meets the requirements of circular economy.

Description

technical field [0001] The invention relates to a vehicle tail gas purification catalytic technology, in particular to a device and a process method for forced aging of a vehicle tail gas purification catalytic material. Background technique [0002] The main pollutants in the exhaust gas of internal combustion engines represented by gasoline vehicles, diesel vehicles, motorcycles and other lean-burn engines include carbon monoxide, residual hydrocarbons from incomplete combustion and nitrogen oxides produced when oxygen is excessive. At present, a mainstream vehicle exhaust gas purification catalytic material generally uses ceramics as the catalytic material carrier, and uses noble metals, transition metals, alkali (earth) metals, and rare earth element oxides as key active components. Oxide coagents represented by elements such as Ce, Zr, Al, and Ba play a key role in a mainstream vehicle exhaust gas purification catalytic technology that meets the national III and nationa...

Claims

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Application Information

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IPC IPC(8): G01N31/10G01N1/28G01N1/44
CPCG01N31/10G01N1/28G01N1/44
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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