Ceramic and metallic converters can be highly effective at reducing emissions from automobile exhaust gases, but the specific efficiency of each type will depend on a variety of factors. It’s important to choose the right type of converter for your specific vehicle and to ensure that it is properly maintained to ensure optimal performance.
The catalytic converter is a steel box-shaped element that connects to the car’s exhaust pipe and reduces harmful gas emissions. The catalytic converter renders harmful unburned Hydrocarbons (HC), Carbon Monoxide (CO), Nitrous Oxides (NOx) in the exhaust gas harmless by chemical reaction. Catalytic convertors are used in both diesel and gasoline engines.
The platinum group metals in catalytic converters perform the conversion process. Platinum, Palladium and Rhodium. A typical catalytic converter is mainly made of a porous metallic or ceramic carrier coated with PGM metals.
The catalytic carrier is surrounded by fibrous material and enclosed in a shell made of stainless-steel plate. The PGM layer is put on a ceramic carrier (Al2O3 with e.g., CeO2 -wash coat), which is honeycomb, meaning a dense network of square holes. This type of structure increases the active surface, which is the contact area of the exhaust gases flowing through the channels and the catalytic substances (Pt, Pd, Rh).
Ceramic converters are typically made from a ceramic substrate coated with a thin layer of noble metals such as platinum, palladium, or rhodium. These metals act as catalysts to facilitate the conversion of harmful gases into less harmful ones. Ceramic converters are known for their high efficiency and durability, as well as their ability to operate at high temperatures.
The table below shows the ceramic converters regular size
Metallic converters, on the other hand, are typically made from a metallic substrate coated with a layer of noble metals. While metallic converters are generally less efficient than ceramic converters, they are often less expensive and can be more effective at reducing NOx emissions.
Ceramic or metallic carriers are the most important factor in catalytic, which are widely used not only in automobiles but also in all industries. The table below shows the advantages of ceramic and metallic carriers.
| Ceramic Carriers | Metallic Carriers |
| Very High Specific Surface, | Ease Of Heat Transfer, |
| High Corrosion Resistance, | Small Hydraulic Resistances, |
| High Adhesion Of Active Substances, | High Mechanical Strength, |
| High Melting Temperature, | All Visible Dust Density, |
| Ease Of Styling. | Smaller Susceptibility To Mechanical Damage. |
The table below shows the efficiency of the gases converted in the
ceramic and metallic converter.
| Conversion Efficiency | Ceramic Carrier | Metallic Carrier |
| HC | 31,58% | 45,62% |
| CO | 32,08% | 33,52% |
| NO | 43,33% | 47,32% |
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Post time: May-15-2023
