Catalyst myths

To make the exhaust gases of cars as harmless to the environment as possible, vehicles are equipped with special devices called catalytic converters – you can buy them on the website in Russia… The main task of such units is the oxidation of harmful compounds for further transformation into substances that are safe for people and the atmosphere.

Despite the fact that such devices are widespread in the assembly of modern machines, today there are various speculations about them. We propose to study together the most common myths and see if they are true.

Myth 1: afterburning in the catalyst of fuel that has not been processed inside the engine


In fact, this opinion is erroneous. As noted above, catalytic converters oxidize hazardous compounds in exhaust gases by special spraying with precious metals (palladium, platinum, rhodium). The inner honeycomb coating reacts with carbon monoxide CO, soot CH and nitrogen oxides NO / NO2 in the presence of oxygen.

During the operation of the motor, heat is generated, due to which the catalyst heats up and the oxidation reactions are activated. That is why catalytic converters are designed to operate at temperatures from +400 to +800 ° C. But there is no question of any fuel combustion process here.

Myth 2: the need to use special fuel for vehicles with catalytic converters

Again, this is a misconception. There are no specific types of gasoline or diesel fuel, which are fueled by cars equipped with a neutralizer. The only condition is the use of high-quality fuel, in which there are no foreign impurities.

Note that the main enemy of catalysts is leaded gasoline. Frequent use of such fuel for refueling a car accelerates the depletion of precious spraying on the inner honeycomb of the device, promotes melting of the ceramic base and breakdown of the lambda probe.

Myth 3: neutralizers are characterized by a minimum service life and quickly fail


This is partly true. A car catalyst has a limited working life – with careful driving and using high-quality fuel, the devices regularly serve about 100-150 thousand kilometers. This is quite normal, because catalytic converters are essentially considered a filter, and filters require periodic replacement.

Note that catalysts are sensitive to mechanical stress. The inner base of the honeycomb is made of rather fragile ceramics. Rock strikes when driving on rough terrain and other influences have a detrimental effect on the integrity of the structure of devices and bring them closer to their early breakdown.

Among the main reasons for the premature wear of converters are:

  • frequent refueling with low-quality fuel or leaded gasoline;
  • ingress of coolant or engine oil into the structure;
  • frequent and prolonged idling of the engine;
  • malfunctions of the ignition or fuel supply system.

Myth 4: reduced engine power in the presence of a catalyst

This can also be considered true, but only under certain conditions. Fully functional catalytic converters do not adversely affect engine power.

But when the internal cells become clogged with soot or are destroyed, this leads to a decrease in the permeability of the exhaust gases, and in this case the engine power already decreases. Therefore, it is categorically not recommended to drive with a faulty catalyst – if the device fails, it must be replaced with a new one.

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