Cold knowledge: your three-way catalytic converter is "worth a thousand dollars"

The previous article mentioned a topic: What are the inconspicuous but high-tech parts in the car? Many people choose three-way catalytic converters.

Three catalytic converter is the most important external purification device installed in the automobile exhaust system. Today, I do a popular science article, sorting out some three catalytic converter internal structure diagram and working principle diagram, to help you further understand the three catalytic

converter

Three-way catalytic converter structure:

The three-way catalytic converter is generally composed of four parts: a shell, a shock absorption layer, a carrier, and a catalyst coating.

The shell is made of stainless steel to prevent the oxide scale from falling off and causing blockage of the carrier. The material of the shock absorption layer is generally an expansion gasket or a steel wire mesh pad, which functions as a seal, heat preservation or fixed carrier to prevent damage to the carrier caused by vibration, thermal deformation and other reasons. The expansion gasket is composed of expanded mica, aluminum silicate fiber and binder.

The expansion gasket expands significantly when it is heated for the first time, but only partially shrinks when it is cooled, so that the gap between the shell and the carrier is completely expanded and sealed.

The catalyst carrier is generally a honeycomb ceramic material, and a few metal (stainless steel) materials are also used. The outside of the three-way catalytic converter is made of double-layer stainless steel sheet steel in a cylindrical shape. Insulation material-asbestos fiber felt is installed in the double-layer sheet sandwich. Inside, there is a cleaning agent in the middle of the mesh partition.

Purifier: The purifying agent is composed of a carrier and a catalyst. The carrier is generally made of aluminum oxide, and its shapes are spherical, polygonal, and net-shaped partitions. Purifiers actually play a catalytic role and are also called catalysts. The catalyst used metal platinum, rhodium and palladium. Spray it on the carrier to form a purifying agent.

The working principle of the three-way catalytic converter:

When the engine exhausts through the exhaust pipe, the three gases of CO, HC and NOx pass through the purifier in the three-way catalyst reactor to enhance the activity of the three gases and carry out oxidation-reduction chemical reactions. Among them, CO is oxidized into colorless, non-toxic carbon dioxide (CO2) gas at high temperature.

HC compounds are oxidized to water (H2O) and CO2 at high temperature.NOxIt is reduced to ammonia (N2) and (O2).

The three kinds of harmful gases become harmless gases, so that the exhaust gas can be purified.

Most of the three-way catalytic converters and their catalysts with good performance are made of rare metals such as platinum (Pt), palladium (Pa), and rhodium (Rn), so they are expensive. In addition to the value of production cost, the help that mature products can bring to the car is even more obvious.

High-quality three-way catalytic converters can help car owners solve problems such as failure alarms, substandard exhaust, car noise, failed annual inspections, weak power, and high fuel consumption.

The three-way catalytic converter jointly designed and developed by GRWA and Tsinghua University has a high influence on the selection, production, testing and quality both locally and worldwide.

GRWA Group’s “Second Factory” produces products from the original factory and directly delivers orders. Not only can it provide general products, but it can also customize products according to customer needs. The factory is equipped with a complete testing laboratory, which can carry out many testing experiments such as shock force test, air tightness test, sound effect test, loading test, etc., to ensure that the products are good products, and that they are guaranteed to provide you with "one-of-a-kind products".

Open the browser and enter "three-way catalyst", you will find that the most clicked topics on the whole network are concentrated around two, one is the various news about the three yuan's repeated stolen, and the other is about the three yuan repair or Do not fix the problem. These topics also explain from the side that the three-way catalytic converter itself is an important automobile accessory with certain technical conditions and high value.

Naturally, choose a high-quality product provided by an excellent company, and don't always worry about ternary repairs. Of course, this "valuable" product of your choice must be prevented from being stolen!