Three Way Catalyst

The three-way catalytic converter is the most important external purification device installed in the car exhaust system. Three way catalyst can convert harmful gases such as CO, HC and NOx from car exhaust into harmless carbon dioxide, water and Nitrogen through oxidation and reduction. Because this kind of catalyst can simultaneously convert the main hazardous substances in the exhaust gas into harmless substances. With the increasingly stringent requirements for environmental protection, more and more cars are equipped with exhaust gas catalytic converters and oxygen sensor devices.


Three way catalyst is installed in the exhaust pipe of the engine, through the oxidation-reduction reaction, carbon dioxide, and nitrogen, so it is also called a three-way (efficiency) catalytic converter.

The Function of Three Way Catalyst:

The main role of the three-way catalytic converter is obvious, and its role is mainly to purify the air exhausted from the rear of the car. When the high-temperature automobile exhaust gas passes through the purification device, the purification agent in the three-way catalyst will enhance the activity of the three gases CO, HC, and NOx, and promote certain oxidation-reduction chemical reactions.
Among them, CO is oxidized at high temperature to become colorless and non-toxic carbon dioxide gas; HC compound is oxidized to water (H20) and carbon dioxide at high temperature; NOx is reduced to nitrogen and oxygen; this achieves the purpose of purifying the air, which is the ternary One of the main functions of the catalytic converter.

twc catalytic converter

Physical Properties of Three Way Catalyst:

Parameters Measurement Standard Typical data
Cordierite crystal phase wt% >90 95
Coefficient Thermal Expansion (-800°C) cm/cm/°C <1.8xl06 1.3-1.5xl06
Thermal Stability ( 550°C ) times >3 >3
Soften Temperature °C >1360 1390
Compression A-axis Mpa 15.0 16.0
Strength B-axis Mpa 3.0 5.0
Specific Weight Kg/L <0.50 230-430
Porosity % 40-45 41
Porosity % 18-28 22-25

Chemical Properties:

Chemical composition Al2O3 SiO2 MgO CaO K2O+Na2O Fe2O3 TiO2
Content% 35.1±1.5% 50.0±1.6% 13.5±0.5% ≤0.5 ≤0.3 ≤1.0 ≤1.0

Packing & Shipping:

We will pack the three-way catalyst in cartons and pallets.

Transportation methods: FedEx, TNT, DHL express, air, and sea, etc.

3 way catalyst

Catalyst Substrates transportation