The structure and capabilities of automotive catalysts Automatic translate
The catalyst is a part whose purpose is to remove exhaust gases. They come in many different areas of life, from oil refineries to automobile ones.
Material of metal catalysts
Typically, the catalyst body itself is made of platinum, palladium or aluminum. And their substrates are made of thin foil with certain alloys.
Metal catalyst substrates
Monolithic catalyst supports are made of thin metal foil made of ferritic alloys with high heat resistance, containing iron, chromium and aluminum. The films are corrugated to produce cellular channels, which usually results in a sinusoidal cell shape. Many substrate designs have been developed in which tied corrugated and flat films are presented, or only corrugated films that can be wound or layered.
In their common design, metal catalytic substrates are made of thin metal foil, flat and corrugated, formed in a honeycomb structure that is placed inside a metal shell. The advantages of metal substrates are their high geometric surface area and low pressure drop associated with a thin wall. Films in metal substrates can be brazed together to provide good mechanical strength and resistance to temperature extremes. The main disadvantage of high-quality metal substrates is their high cost.
Scope of metal catalysts
The first main area of application of metal substrates was the prototypes of converters with close connection in gasoline cars. In this high temperature application, metal substrates eliminate ceramic mounting mats, resulting in a reliable catalytic system. In some cases, mainly in some luxury car models, metal base substrates have also been used in the main catalytic converter.
There were relatively few metal substrate applications in OEM diesel engines — examples include the 2007 Dodge Ram with NAC and 2010, followed by the Navistar Maxxforce engines that did not use Nox after processing. Metal substrates are more commonly used for diesel aftermarket or retrofit converters. Another common use of metal substrates is a catalytic converter for stationary engines, where the design of the metal foil can significantly increase the diameter than ceramic honeycombs.
The structure of the metal catalyst
Most metal converters have cellular structures made of thin foil in various configurations, with channels formed by corrugating the foil. A number of alternative concepts have been proposed, such as Jatkar 1997 metal foams or Roychoudhury 1997 flat perforated film assemblies, but they have not been widely accepted.
Advantages of Metal Foil Substrates
Metal foil substrates can provide significant flexibility in channeling. For example, conical shaped substrates can be assembled to improve the distribution of the exhaust gas flow through the Maus 1998 converter. A number of specialized designs have been developed to solve various applications, including turbulent flow designs, particle oxidation catalysts, and electrically heated catalysts.
Where can metal catalysts be disposed of?
These useful parts, widely used in industry and the automotive industry, cannot simply be thrown into the trash. They must be handed over to a special company that receives catalysts in Moscow. Used metal catalysts are received there. Prices, of course, are different everywhere, but the highest officially recorded price in Moscow is 35 thousand rubles per catalyst.
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