BMW 730 Exhaust Pipe Catalytic Converter

The three-way Catalytic Converter is the most important external purification device installed in the automobile exhaust system, Direct- Fit Three Way Catalytic which can transform the harmful gases such as CO, HC and NOx discharged from the automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction.  When the high-temperature automobile exhaust passes through the purification device, the purifying agent in the Three Way Catalytic Converter will enhance the activity of the three gases CO, HC and NOx, and promote it to undergo a certain oxidation-reduction chemical reaction, in which CO oxidizes to become colorless and non-toxic carbon dioxide gas at high temperature;  HC compounds oxidize to water (H2O) and carbon dioxide at high temperatures;  NOx is reduced to nitrogen and oxygen.  Three harmful gases become harmless gases, so that car exhaust can be purified.

A ternary catalytic converter reactor is similar to a silencer. The outside is made of a double layer of stainless steel. The insulation material, asbestos fiber felt, is installed in the double-layer sheet interlayer. The interior contains a cleaning agent in the middle of the mesh partition. The purification agent consists of a carrier and a catalyst.

Catalyst is very sensitive to sulfur, lead, phosphorus, zinc and other elements, sulfur and lead from gasoline, phosphorus and zinc from lubricating oil, these four substances and their combustion in the engine after the formation of oxide particles are easy to be adsorbed on the surface of the catalyst, so that the catalyst can not contact with the exhaust gas, thus losing the catalytic effect, the so-called "poisoning" phenomenon.

When the car works at a low temperature for a long time, the three-way catalytic converter cannot be started, the carbon smoke from the engine will adhere to the surface of the catalyst, resulting in no contact with CO and HC, and in the long run, the pores of the carrier will be blocked, affecting its conversion efficiency.