Many car owners know that the three-way catalytic converter is an important part of the car. Once it is dirty, it must be cleaned in time, otherwise it will endlessly endanger. So how much is the cleaning of the three-way catalytic converter? Why do some people say that they can't wash?
The three-way catalytic converter is the most important off-board purification device installed in the exhaust system of automobiles. It can convert harmful gases such as CO, HC and NOx emitted from automobile exhaust into harmless carbon dioxide, water and oxidation through oxidation and reduction. Nitrogen. Since this catalyst can simultaneously convert three main harmful substances in the exhaust gas into harmless substances, it is called ternary.
Reasons for the failure of the three-way catalytic converter:1. High temperature deactivation: The three-way catalytic converter will cause high temperature deactivation under high temperature conditions for a long time. The reason for the high temperature of the three-way catalytic converter is:
(A) Engine misfire causes the unburned mixture to burn in the catalyst to undergo a violent oxidative exothermic reaction.
(B) The car runs continuously at high speed and large load.
(C) The car suddenly brakes and decelerates.
The exhaust temperature of the engine varies widely, usually 300~400°C for idle speed, 400~600°C for low speed and medium speed, and 900°C for high speed full load. If the three-way catalyst is exposed to a high temperature environment above 800 °C for a long time, the active components of the catalyst, such as platinum, palladium and rhodium, are volatile, and the coating is easily peeled off. Significantly increased, and the carrier alumina will also undergo a phase change, which will be smaller than the larger γ-type surface than the surface? Type, thereby aggravating the growth and aggregation of the noble metal active component and the auxiliary cerium oxide crystal grains, causing the specific surface of the catalyst to drop sharply and deactivating the catalyst. The high temperature also causes a decrease in the oxygen storage capacity of the cerium oxide auxiliary agent, and the oxygen absorption capacity of the catalyst rapidly decreases at 800 ° C, so that the activity of the catalyst is greatly reduced.
2, chemical poisoning: sulfur, phosphorus, anti-explosives in the fuel and lubricants, manganese, lead, carbon monoxide produced by incomplete combustion of the fuel will cause three-way catalyst poisoning failure, the poison is mainly adsorbed on the active surface of the catalyst, and A chemisorbed complex is formed, in which lead poisoning is often irreversible, and the catalyst completely loses its activity when it is operated for several tens of hours in a lead-containing atmosphere, while the activity of the catalyst is under certain conditions for sulfur, phosphorus and carbon monoxide poisoning. Can be recovered.
3, carbon inactivation: due to carbon deposition on the ternary catalyst and coating surface caused by the three-way catalytic converter failure for carbon deposition deactivation, carbon deposits covering the surface of the coating is often a carbon, hydrogen, sulfur A mixture of various elements such as nitrogen, oxygen, and heavy metals, and the deactivation of carbon deposits is one of the main causes of the failure of the three-way catalyst.
4, clogging failure: three-way catalytic converter due to clogging failure caused by abnormal engine operation is a common problem of environmentally friendly engines, the common forms of three-way catalytic converter blockage are:
(A) Sinter plugging using ethanol gasoline colloidal carbon deposits.
(B) Sulfur phosphorus chemical complex sintering blockage.
(C) Sintered blockage of lead-manganese metal deposits.
(D) Misfire of the engine causes the ceramic carrier to be blocked by dissolution.
(E) The misfire of the engine causes high temperature aging of the sealing layer between the ceramic carrier of the three-way catalyst ceramic and the metal casing, and becomes a ceramic carrier of the latter half of the powder.
The occlusion of the three-way catalyst is gradually formed, and the generation of the clogging is reversible. The clogging can be reduced by chemical processes such as oxidation and gasification, or can be reduced by physical processes such as desorption and volatilization components, and vapor phase component evaporation.
Some people say that the three-way catalyst can't be washed? It is because some car owners do not understand washing, fear of residual carbon monoxide (CO), causing poisoning incidents. Carbon monoxide is a colorless, odorless, dangerous invisible killer. Once leaked, the owner will be unknowingly poisoned.
The working principle of the three-way catalytic converter is this. When the high-temperature automobile exhaust passes through the purification device, the purifying agent in the three-way catalytic converter will enhance the activities of the three gases CO, HC and NOx, and cause it to undergo a certain oxidation-reduction chemical reaction, in which CO is oxidized at a high temperature to become Color, non-toxic carbon dioxide gas; HC compounds are oxidized to water and carbon dioxide at high temperatures; NOx is reduced to nitrogen and oxygen. The three harmful gases become harmless gases, so that the car exhaust can be purified. Sometimes some car exhaust pipes will drip, which is the case.
Since the three-way catalytic converter is installed in the chassis of the automobile and has to perform various gas conversions, it is relatively easy to be dirty, so it is necessary to clean it frequently, but many owners do not know how to clean it. How much does it cost? The part king is a large-scale auto parts B2B platform in China, which supplies a large number of new parts, second-hand parts, scrap parts and rebuilt parts.
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