What is the importance of catalytic converters?

As we all know, vehicles need to be inspected for keep safe and enhance the maintenance of the vehicle. When high temperature exhaust gas passes through the purification device, the purifying agent in the catalytic converter will enhance the activity of the three harmful gases CO, HC and NOx in the exhaust gas, prompting them to undergo oxidation-reduction reactions, thus transforming the harmful gases into harmless gases for emission. 

The CO is changed to carbon dioxide at high temperatures, the HC compounds are changed to water and carbon dioxide, and the NOx is reduced to oxygen and non-toxic nitrogen.

The catalytic converter is essentially an off-board purification device installed in the exhaust system of a petrol vehicle. It looks like a muffler, with shell made mostly of stainless steel plates and heat-resistant steel, and a liner that is divided into two types: an intumescent liner and a non-intumescent liner made of ceramic fiber, vermiculite and organic binders. 

The catalytic converter is divided into two types: universal and specialized. The specialized catalytic converters will come with header for special models. Universal catalytic converters are available in different sizes, carrier materials, mesh numbers and standards(Euro1-Euro6), as well as in ample styles. 

The catalytic converter is essentially an off-board purification device installed in the exhaust system of a petrol vehicle. It looks like a muffler, with shell made mostly of stainless steel plates and heat-resistant steel, and a liner that is divided into two types: an intumescent liner and a non-intumescent liner made of ceramic fiber, vermiculite and organic binders. The catalytic converter is divided into two types: universal and specialized. The specialized catalytic converters will come with header for special models. Universal catalytic converters are available in different sizes, carrier materials, mesh numbers and standards, as well as in ample styles. We can offer different standards from Euro 1 to Euro 6.

The carriers for cats are divided into metal and ceramic carriers. Metal carriers are quick to heat up and have low back pressure, which are often made of corrugated metal plates.

GRWA catalytic converters can not only meet national emission standards, but also EPA certification and have been exported to the USA, Australia and other countries for almost 13 years. They are very popular in vehicle modification groups around the world.

As the composition of petrol and diesel differs, so do the exhaust gas cleaning devices. DPFs are wall-flow cellular ceramics made of cordierite or silicon carbide, which are installed in the exhaust system of diesel vehicles to reduce particulate matter by filtration.

The DOC, on the other hand, is an oxidation device that oxidises CO as well as CH compounds and is coated with precious metals, mainly are platinum and palladium. The oxidation catalyst DOC is only capable of oxidising itself due to the limitations of the coating, so it can only rely on the oxidation reaction to convert CO and HC into water and carbon dioxide. In the case of diesel engines, the DOC can provide good removal of soluble organic components from diesel emission particles by means of catalytic oxidation technology.

Selective catalytic reduction (SCR) is a specialized treatment device for NOx in the exhaust of diesel vehicles. SCR uses a high temperature environment to rapidly mix and reduce NOx and automotive urea to produce nitrogen and water for emission.

As a more mature flue gas denitrification technology, SCR chooses transition metals as catalysts to reduce NOx emissions at a greater extent. This approach is more efficient in denitrification and the technology is more mature. In order to improve the denitrification efficiency greatly, GRWA has improved the catalyst composition by adding honeycomb, plate and corrugated catalysts, as well as testing the catalysts at high, medium and low temperatures, resulting in an SCR technology with significant denitrification efficiency, which is now widely used in domestic and international diesel vehicle conversions and has become the mainstream technology for flue gas denitrification.

In order to ensure the long and efficient use of the device, GRWA uses high quality low sulphur and phosphorus formula lubricants with advanced low ash formula design, which greatly reduces the toxicity of sulphur to the catalyst. 

Some data shows that the improved oxidation type catalyst can reduce PM emissions by 40%-50%, increasing the processing efficiency of HC and CO by 80%, The vehicle engine performance is significantly improved.