Purifier and preparation method thereof

Abstract

The invention discloses a purifier and a preparation method thereof. The purifier comprises a shell and a honeycomb ceramic carrier, wherein the honeycomb ceramic carrier is arranged in the shell; the porous structure of the honeycomb ceramic carrier comprises S-shaped passages and straight passages; the straight passages are communicated with the S-shaped passages; the honeycomb ceramic carrier comprises the following ingredients by mass: 6 to 10 percent of sintering additives, 2 to 5 percent of one or more rare earth oxides, 2 to 4 percent of a binding agent, 1 to 2 percent of carbon fiber, and the balance of aluminum oxide powder. According to the preparation method, the particle diameter of aluminum oxide is reduced, and rare earth oxide and carbon fiber are added, so that the carrier is high in compressive strength, low in thermal expansion coefficient, and relatively low in sintering temperature; the preparation method is simple and efficient, and is suitable for mass production of purifiers.

Description

technical field [0001] The invention relates to the field of automobile exhaust gas purification, in particular to a purifier and a preparation method thereof. Background technique [0002] With the increasingly prominent air pollution problem and the rapid increase in the number of automobiles, the exhaust gas emitted by automobiles has become one of the main sources of urban air pollution. The harmful substances in automobile exhaust mainly include CO, NOx and HC, polycyclic aromatic hydrocarbons (PAH) and suspended solids (SPM). NOx and HC undergo a series of photochemical reactions in the atmosphere, and easily generate a variety of highly oxidizing substances such as ozone, forming photochemical smog. Photochemical smog not only seriously harms human health, but also causes serious damage to animals, plants and various materials. [0003] The purifier is the most important external purification device installed in the automobile exhaust system. It can convert the harm...

AI Technical Summary

Problems solved by technology

Precipitation encapsulation method and sol-gel method have relatively strict process requirements, complex synthesis process, raw materials are mostly organic compounds, expensive, and some are harmful to human body, so it is difficult to meet the requirements of industrial applications

In terms of improving the properties of cordierite ceramics by adding additives, most of the additives are a single component, and the average thermal expansion coefficient is often small, but there is a large difference in the thermal expansion coefficients of the a-axis and c-axis, and it is difficult to make "zero expansion" Harmonizes with anisotropic thermal effects, thereby reducing the thermal performance of cordierite ceramics

[0006] Alumina is also a common ceramic material, which has many excellent properties such as high temperature resistance, wear resistance, corrosion resistance, and oxidation resistance. High energy, low diffusion coefficient, high sintering temperature, and its application is limited due to its high brittleness and high thermal expansion coefficient, so it is urgent to find an effective method to solve the above problems.

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