Doc Poc Scr Cordierite Honeycomb Ceramic Catalyst Substrate

Honeycomb Catalytic Converter There are many methods of purification: ① catalytic oxidation method (a stage purification method), the use of a stage of oxidation type catalyst bed, so that carbon monoxide and hydrocarbons in the exhaust gas are completely oxidized into carbon dioxide and water. This method does not remove nitrogen oxides. ② Catalytic oxidation-reduction method (two-stage purification method), the automobile exhaust gas through the first stage of the reduced catalyst bed, so that nitrogen oxides are reduced to nitrogen, and then through the second stage of the oxidized catalyst bed, so that carbon monoxide and hydrocarbons are oxidized to carbon dioxide and water. Car Ceramic Catalyst This method can remove carbon monoxide, nitrogen oxides, hydrocarbons in automobile exhaust. However, nitrogen oxides are reduced to ammonia (NH3) through the first reduced Ceramic Catalyst bed, and enter the second oxidized catalyst bed, and a part of ammonia is oxidized to nitrogen oxides, which reduces the purification rate of nitrogen oxides. In addition, due to the addition of a catalyst bed, the resistance increases, the fuel consumption increases, and the acceleration effect decreases. (3) Three-way catalytic purification method, this method is the use of carbon monoxide, hydrocarbons and nitrogen oxides have catalytic effects on the catalyst. When the air to fuel ratio (air-fuel ratio) of the automobile and internal combustion engine is strictly adjusted to the stoichiometric value of 14.7±0.1, this method has a high purification efficiency. The purifier using this method needs to attach a set of precise air-fuel ratio control system.