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

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...

AI Technical Summary

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, the current mainstream laboratory aging process either lacks key parameter investigation or is expensive to operate and difficult to conduct further scientific analysis, and the aging scheme for different types of vehicle exhaust purification catalytic materials also lacks high efficiency and flexibility

At the same time, the coexistence of the above methods has led to the emergence of some contradictory research conclusions, affecting the progress of research and the scientific nature of the results.

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