DIESEL OXIDATION CATALYST
Ceramic Diesel Oxidation Catalysts used in marine diesel engine as catalytic converter
Cordierite ceramic DOC are one of the most reliable way to reduce pollutants of diesel particulate emissions. DOC technology controls emissions of hydrocarbons (HC), carbon monoxide (CO) and particulate matter (PM) from diesel vehicles.
Our Cordierite ceramic DOC are made of cordierite material, which is raw material molding and synthesized cordierite after burning. DOC’s channels are unimpeded, the exhaust gas can flow it smoothly, then HC, CO, PM are oxidized rapidly under the catalyst (precious metal), noxious emission are reduced effectively and reach emission standard.
Product Highlights:
1.Low coefficient of thermal expansion (TEC), good thermal shock resistance.
2.Good water absorption with small fluctuation, strong sorption for catalysts, high surface area.
3.Low material density, rapid light-off, low pressure drop, high conversion rate.
4.High surface area, high CPSI, thin wall, low back pressure, high compressive strength.
Product Applications:
Ceramic Honeycomb Monolith DOC can be used in Light bus, City bus, Medium truck, Heavy truck, Delivery vans, Sanitation trucks, Construction trucks and so on.
For example, in Hong Kong thousands of delivery vans, sanitation trucks, pieces of construction equipment and other diesel vehicles have been retrofitted with DOC technology under a program administered by the Hong Kong Special Administrative Region.
Ceramic Honeycomb Monolith DOC’ Working Principle
DOC’s oxidation theory is same as gasoline engines, after coating with precious metal, has excellent performance in light bus, city bus, medium truck and heavy truck applications, and it is also currently in use on tens of thousands of retrofitted vehicles around the world. It can be reach better purifying effect when it works together with Diesel Particulate Filter(DPF).
Physical & Chemical Properties
| Items | Index | Test Methods | |
| Chemical Composition | Al2O3 | 35.20% | Chemical Analysis |
| SiO2 | 50.90% | ||
| MgO | 13.90% | ||
| Cordierite Crystal Phase | ≥90% | X-ray diffraction | |
| Wall Thickness mm | 300 cpsi | 0.23 mm | Vernier Caliper |
| 400 cpsi | 0.16 mm | ||
| Compression Strength at Room Temperature | Lengthways | ≥15Mpa | Uniersal Material Testing Machine |
| Horizontal | ≥2Mpa | ||
| Coefficient of Thermal Expansion (20-800℃) CTE | ≤1.2*10-6/℃ | Thermal DilaTometer | |
| Water Absorption | 23-27% | Gravimetric Method | |
| Soften Temperature | ≥1400℃ | High-temperature Electric Resistance Furnace | |
| Thermal Shock Resistance(indoor temperature -550℃) | 550℃ （No Crack After Three times） | Air cooling | |
| Tolerance of Outside Dimensions | ±1% | Vernier Caliper | |
| Bulk Density | 0.4-0.5 KG/L | Gravimetric Method | |
DOC Specification
| Items | Sectional size in/mm | CSA(cross sectional area) mm2 | Sectional Shape | CPSI | Material | High mm |
| LS-C01 | 118.4mm(4.66″) | 11010 | Round | 300-400 | Cordierite | ≤200 |
| LS-C02 | 143.8mm(5.66″) | 16286 | Round | 300-400 | Cordierite | ≤200 |
| LS-C03 | 150mm(5.9″) | 17671 | Round | 300-400 | Cordierite | ≤200 |
| LS-C04 | 165mm(6.5″) | 21382 | Round | 300-400 | Cordierite | ≤200 |
| LS-C05 | 170mm(6.69″) | 22697 | Round | 300-400 | Cordierite | ≤200 |
| LS-C06 | 175mm(6.89″) | 24052 | Round | 300-400 | Cordierite | ≤200 |
| LS-C07 | 190mm(7.5″) | 28352 | Round | 300-400 | Cordierite | ≤200 |
| LS-C08 | 210mm(8.27″) | 34635 | Round | 300-400 | Cordierite | ≤200 |
| LS-C09 | 228mm(9″) | 40828 | Round | 300-400 | Cordierite | ≤200 |
| LS-C10 | 241.3mm(9.5″) | 45288 | Round | 300-400 | Cordierite | ≤200 |
| LS-C11 | 266.7mm(10.5″) | 55990 | Round | 300-400 | Cordierite | ≤200 |
| LS-C12 | 286mm(11.25″) | 64242 | Round | 300-400 | Cordierite | ≤200 |
| LS-C13 | 305mm(12″) | 73061 | Round | 300-400 | Cordierite | ≤200 |
| LS-C14 | 330mm(13″) | 85529 | Round | 300-400 | Cordierite | ≤200 |
The specification can customized according customers demand
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