1. TWC
three-way catalyst is the most important in automotive exhaust gas purification apparatus outside the machine system is installed, it can be discharged from automobile exhaust CO, HC and NOx and other harmful by oxidation and reduction gas into harmless carbon dioxide, water and nitrogen. Since this catalyst in the exhaust gas can be simultaneously three major harmful substances into harmless substances, so called three yuan.
three-way catalyst works is: when the temperature of the automobile exhaust gas purifying apparatus through, the three-way catalyst will be enhanced CO.’S scavenger, HC and NOx activity of three gases, which causes a certain oxidation – reduction chemical reaction in which CO is oxidized to colored at a high temperature, non-toxic carbon dioxide gas; the HC compound at a high temperature oxidation of water (H20) and carbon dioxide; the NOx reduction to nitrogen and oxygen. Three kinds of harmful gases into harmless gases, to purify the automobile exhaust.
The reactor similar catalytic muffler. With double its outer cylindrical stainless sheet steel. —- asbestos fibers with heat insulating material mat bilayer sheet sandwich. Internal intermediate separator mesh with a cleaning agent. Scavenger carrier and catalyst. Support is generally made of aluminum oxide, which has a spherical shape, a polygonal shape, and a mesh separator and the like. Scavenger actually catalytically active, also referred to as catalyst. The catalyst used is platinum, rhodium, palladium. In which A spraying on a carrier, constitutes scavenger.
three-way catalyst is generally not cleaned, if catalytic oxidation powerful direct replacement. Because the three-way catalyst operating temperature is about 350 degrees, preferably no liquid residue, the cleaning is not good.