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HENAN ZG INDUSTRIAL PRODUCTS CO.,LTD |
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Ceramic catalysts carriers
for purification of gasoline and diesel automobile engines exhaust
A catalyst is a substance that accelerates the course of a chemical reaction without undergoing an irreversible change. Catalysts are important not only for the chemical industry, but also for solving environmental problems.
Ceramic structures with a high specific surface are used as carriers for catalysts. The high specific surface should be preserved after long-term use, as well as geometry and mechanical properties, which implies the carrier’s resistance to thermal and mechanical stresses and to chemical destruction.
Physical and Chemical Properties
| Items | Unit | Index | ||
| Chemical Composition | SiO2 | % | 49-51 | |
| Al2O3 | % | 33-35 | ||
| MgO | % | 13-14 | ||
| Wall Thickness | mm | 100 CPSI | 0.43 | |
| 200 CPSI | 0.32 | |||
| 300 CPSI | 0.30 | |||
| 400 CPSI | 0.18 | |||
| 600 CPSI | 0.15 | |||
| Crush Strength | A-axis | Mpa | ≥16 | |
| B-axis | Mpa | ≥3 | ||
| Water Absorption | % | 25±2 | ||
| Coefficient of Thermal Expansion | 10-6/K-1 | 0.8-2.0 | ||
| Maximum Operating Temperature | °C | ≥1370 | ||
| Bulk Density | Kg/L | 0.43-0.75 | ||
Ceramic catalysts carriers are usually used:
for purification of gasoline and diesel automobile engines exhaust;
for chemical and petroleum refining processes;
for cleaning emissions of power plants and other industrial enterprises.
The main requirements for catalyst carriers include a large surface area, heat resistance, porosity, chemical inertness, mechanical strength.
Ceramic and metal carriers compete with each other: ceramics are
often more stable and more economical, and therefore dominate in
most sectors. Metal is sometimes preferable because of greater
mechanical strength and the ability to manufacture catalysts of a
certain geometry using wire, foil or thin-wall honeycomb
structures.
Product Characteristics
● Large specific surface area: to ensure full access to the exhaust gas with the catalyst.
● Stable water absorption: to ensure the catalyst evenly firmly attached to the surface of the catalyst carrier.
● Warm-up: after start-up the engine, the temperature of the carrier can reach the catalyst activation temperature in the shortest possible time.
● Low exhaust resistance: the engine’s exhaust resistance is small, to ensure that doesn’t affect the engine performance.
● High strength: the operating environment of the catalyst carrier is in the bumpy car, so the catalyst carrier must be high strength without being external damage.
● Good assembly: the carrier is an exhaust assembly parts, only good appearance and precise dimensions can ensure perfect assembly.
