Forced aging apparatus and technique for motor vehicle vent gas purification catalysis material

Abstract

The invention relates to a device and a process method for forcedly aging a motor vehicle tail gas purifying and catalyzing material. The process comprises: loading the motor vehicle tail gas purifying and catalyzing material into an aging reaction tube and heating the material; introducing an aged gas into a bed layer of a reactor catalyzing material for aging treatment for 5 to 20 hours at a temperature of between 400 to 1,300 DEG C; and taking out the aged catalyzing material, and testing the material. The aging device mainly comprises a gas path, an aging tube reactor and a temperature control component. The device and the method are used for carrying out service life investigation and activity screening on the motor vehicle tail gas purifying and catalyzing material containing at least one class of oxide corresponding to elements like cerium, zirconium, aluminum, barium and the like. The device and the method have the advantages of real and reliable test result, simple operation process, small operation risk, good repeatability and easy realization of engineering scale-up. Highly toxic waste gas, waste liquid and waste residue are not discharged in the process of processing so the invention meets the circular economy requirements.

Description

technical field [0001] The invention relates to a motor vehicle tail gas purification catalytic technology, in particular to a device and a process method for forced aging of a motor 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, the mainstream catalytic materials for purification of motor vehicle exhaust generally use ceramics as the carrier of catalytic materials, and use precious metals, transition metals, alkali (earth) metals, and rare earth element oxides as key active components. Oxide activators represented by elements such as Ce, Zr, Al, and Ba play a key role in the mainstream motor vehicle exhaust purification catalytic technology that...

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 conversion of carbon monoxide, residual hydrocarbons and nitrogen oxides can be considered to be acceptable, the comprehensive effect is still not considered. The fuel ratio conditions and the significant presence of gases such as water vapor and carbon dioxide are of concern (see the literature "Applied Catalysis B: Environmental 76(2007) 357")

[0008] To sum up, the current mainstream laboratory aging process either lacks key parameter investigations or is expensive to operate and difficult to conduct further scientific analysis, and the aging scheme for different types of automotive 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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