Description
DOC honeycomb ceramic for car Specification:
DOC honeycomb ceramic for car is the core component of automobile exhaust after-treatment system. In the 1970s, cordierite honeycomb ceramic was used as a carrier coated with exhaust after-treatment catalyst, providing high reaction for exhaust after-treatment chemical reaction. Automobile exhaust after-treatment system has gradually developed with honeycomb ceramic carrier as the core.
According to the different exhaust gas flow modes, honeycomb ceramic carriers are mainly divided into straight-through carriers and wall-flow carriers. Among them, straight-through carriers mainly include SCR carriers, DOC carriers, ASC carriers, and TWC carriers; wall-flow carriers mainly include DPF and GPF. Among the above carriers, TWC carriers and GPF are used for gasoline vehicles, and SCR carriers, DOC carriers, ASC carriers and DPF are used for diesel vehicles.
Technical Index:
| Parameters | Measurement | Standard | Typical data |
| Cordierite crystal phase | wt% | >90 | 95 |
| Coefficient Thermal Expansion (-800°C) | cm/cm/°C | <1.8xl06 | 1.3-1.5xl06 |
| Thermal Stability ( 550°C ) | times | >3 | >3 |
| Soften Temperature | °C | >1360 | 1390 |
| Compression A-axis | Mpa | 15.0 | 16.0 |
| Strength B-axis | Mpa | 3.0 | 5.0 |
| Specific Weight | Kg/L | <0.50 | 230-430 |
| Porosity | % | 40-45 | 41 |
| Porosity | % | 18-28 | 22-25 |
The three-way catalyst (TWC) is made of cordierite honeycomb ceramics as a carrier, rare earth composite oxides as additives, and a small number of precious metals (PD/PD/RH) added and sintered after a special coating process. The product makes full use of the coordinated effects of precious metals and rare earth composite oxides. The carbon monoxide CO, hydrocarbons HC, and nitrogen oxides NOX in the exhaust gas undergo oxidation/reduction, thereby converting them into non-toxic carbon dioxide, water and nitrogen.
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