What is automotive exhaust gas purification catalyst

At present, the methods to reduce automobile exhaust pollution are mainly divided into in-engine purification and off-engine purification.

In-engine cleaning is mainly to improve the quality of fuel and improve the combustion conditions of fuel in the engine to reduce the pollutants as much as possible.

generation, which plays a greater role in reducing exhaust pollution. But the effect is limited, and to varying degrees to the power and economy of the car

The effect is limited and has a negative impact on the dynamics and economy of the vehicle.

The key to the technology is to develop catalysts with good performance.

Due to the special working conditions of automobile internal combustion engine, such as sudden start, acceleration, parking, often accompanied by significant changes in gas flow, composition and temperature parameters, coupled with the vibration and exhaust volume of the car when driving, the catalyst used for automobile exhaust gas purification must have the following properties in addition to the characteristics of the general exhaust gas purification catalyst:

1. catalyst performance must be suitable for various conditions installed next to the internal combustion engine, and must be adapted to frequent and large changes in gas flow, composition and temperature;

2. the catalyst must have sufficient mechanical strength to prevent the catalyst activity from decreasing and clogging due to vibration of the reactor with the car and the catalyst breaking due to sudden cold and heat.

3. The catalyst must have a wide active temperature range [both at high temperature (800~1000℃) and at low temperature (150-200℃) with sufficient

The catalyst should have sufficient activity at both high temperature (800~1000℃) and low temperature (150-200℃).

4. The catalyst activity should be high, the dosage should be low, and the corresponding reactor should be small and light, so that it can be easily installed in a suitable

The corresponding reactor should be small in size and light in mass, and easy to install in the right location:

5. The catalyst must have a suitable pore structure and particle structure to minimize the resistance of the exhaust stream

6. The catalyst should preferably be triple-acting, capable of simultaneously purifying and treating carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOx), and other gases.

Composition of automobile exhaust gas purification catalyst

1.Active component

2. additives

3. carrier

4.Coating