Structure and capabilities of automotive catalysts

A catalyst is a part whose purpose is to remove exhaust gases. They come in a variety of areas of life, from oil refining to automotive.

Metal catalyst material

Typically the catalyst body itself is made of platinum, palladium or aluminum. And their substrates consist of thin foil with certain alloys.

Metal catalyst supports

Monolithic catalyst supports are made of thin metal foil of highly heat resistant ferritic alloys containing iron, chromium and aluminum. The films are corrugated to produce cellular channels, which typically results in a sine wave-shaped cell shape. Many substrate designs have been developed that feature bonded corrugated and flat films or just corrugated films that can be wound or layered.

Substrate materials

In their common design, metal catalytic supports are made of thin metal foil, flat and corrugated, formed in a honeycomb structure, which is placed inside a metal shell. The advantages of metal substrates are their high geometric surface area and the low pressure drop associated with a thin wall. Films in metal substrates can be bonded together to provide good mechanical strength and resistance to temperature changes. The main disadvantage of high-quality metal substrates is their high cost.

Scope of application of metal catalysts

The first major application for metal substrates was prototypes of close coupling converters in gasoline vehicles. In this high temperature application, metal substrates eliminate ceramic mounting mats, resulting in a reliable catalyst system. In some cases, mainly in some luxury car models, metal base substrates have also been used in the main catalytic converter.

There have been relatively few applications of metal substrates in OEM diesel engines - examples include the 2007 Dodge Ram with NAC and 2010 and then Navistar Maxxforce engines that did not use Nox after treatment. Metal substrates are more widely used for diesel aftermarket or modified converters. Another common application of metal substrates is in the catalytic converter for stationary engines, where the metal foil design allows for significantly larger diameters than ceramic honeycombs.

Structure of a metal catalyst

Most metal transducers have cellular structures made from 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 these have not gained widespread acceptance.

Advantages of metal foil substrates

Metal foil substrates can provide significant flexibility in channel formation. For example, conical shaped substrates can be assembled to improve the distribution of exhaust gas flow through the Maus 1998 converter. A number of specialized designs have been developed to address a variety of applications, including turbulent flow designs, particle oxidation catalysts, and electrically heated catalysts.

Where can metal catalysts be disposed of?

Widely used in industrial and automotive applications, these useful parts cannot simply be thrown into the trash. They must be handed over to a special company that accepts catalysts in Moscow. There, used metal catalysts are accepted. Prices, of course, are different everywhere, but the highest officially recorded price in Moscow is 35 thousand rubles per catalyst.

http://replacement-catalyst.moscow
+7 (495) 142-09-55
Moscow Filevsky Boulevard, 1с1