Special cleaning agent for three-way catalyst of vehicle

Abstract

The invention relates to a cleaning agent, in particular to a special cleaning agent for a three-way catalyst of a vehicle. The cleaning agent is a mixed solution of one or combination of 3 to 10 percent of hydrochloric acid or sulfamic acid with inorganic acid concentration of 31 percent, 2 to 5 percent of surfactant sodium dodecyl sulfate and 1 to 5 percent of sodium triphosphate, one or combination of 1.5 to 5 percent of corrosion inhibitor isoquinoline quaternary ammonium salt and 1.5 to 5 percent of EDTMPS, 0.5 to 3 percent of chelating agent cetyl trimethyl ammonium bromide, and 50 to 60 percent of water. The cleaning agent can directly clean the three-way catalyst under any condition, especially under the condition that the vehicle engine cannot be started, so as to achieve the aim of effectively and quickly removing the gum deposited carbide of the three-way catalyst of the vehicle, and has the characteristics of high product cost performance, environment friendliness, multiple functions and the like, is convenient in use, and can reactivate the vehicle three-way catalyst and prolong the service life of the vehicle three-way catalyst.

Description

1. Technical field [0001] The invention relates to a cleaning agent, in particular to a special cleaning agent for three-way catalytic converters of automobiles. 2. Background technology [0002] When the automobile engine exhausts through the exhaust pipe, when the three gases of carbon monoxide, hydrocarbons and nitrogen oxides pass through the three-way catalytic converter of the automobile, the grids coated with rare and precious metals such as rhodium, platinum, and palladium layers as catalysts are respectively spaced, and the gas is enhanced. The activity of the three gases is determined, and the oxidation-reduction chemical reaction is carried out through the combustion in the three-way catalytic converter of the automobile, in which carbon monoxide is oxidized into colorless and non-toxic carbon dioxide gas at high temperature, and hydrocarbons are oxidized into water and carbon dioxide at high temperature , Nitrogen oxides are reduced to nitrogen and oxygen at high...

AI Technical Summary

Problems solved by technology

The temperature at which it starts to work is about 200°C, and the best working temperature is 400-800°C. After exceeding 1000°C, the rare and precious metal components used as catalysts will also undergo chemical changes, so that the three-way catalytic converter grille of the car The effective catalyst composition is reduced, and the catalytic effect is weakened. Due to the oxidation-reduction chemical reaction will generate heat. When the engine is working normally, when the content of carbon monoxide and hydrocarbons is appropriate, the heat generated by the combustion will keep the three-way catalytic converter of the car at the optimum level. When the engine is working abnormally, the content of carbon monoxide and hydrocarbons in the exhaust gas will far exceed the normal content, especially when the car is used for a long time, the content of medium and low-grade lubricating oil and poor quality fuel There are many harmful impurities such as sulfur and phosphorus, or when the car is often idling or running slowly due to road congestion, sometimes the driving conditions are poor, the ignition time of the engine is too late due to a fault, or some cylinders misfire and do not work, or the fuel injection is normal but difficult to start, Phenomena such as too thick mixture, engine burning engine oil, etc. will cause colloidal carbonization and carbonization in the car engine intake, exhaust and fuel system. The three-way catalytic converter of the car is blocked or even scrapped. After the blockage, it will not only increase the fuel consumption of the car, reduce the power, and the exhaust gas will exceed the standard, and even cause the vehicle to fail to start.

[0003] In order to solve the above problems, Chinese patent 200810010534.7 discloses a "cleaning agent for three-way catalytic converters of automobiles", which contains 3-5% of sodium tripolyphosphate, 5-8% of organic acid tartaric acid, and 1.8-3.8% of hydrofluoric acid. , A mixed solution of 1.5-2.5% urotropine, 1-5% citric acid, 0.5-1.5% peracetic acid, and 8-18% water can be used one hour after starting the car engine and can be cleaned at high temperature Three-way catalytic converters for automobiles have the following disadvantages: one is that the cars that cannot be started cannot be used; the other is that the vehicle must be started for more than an hour when cleaning. Since the faulty car is cleaned in the workshop, it wastes gasoline and emits exhaust gas The harmful gas permeated in the workshop directly affected the physical and mental health of the workshop personnel, and at the same time, a large amount of decomposed carbon deposits on the wall of the intake manifold would enter the engine combustion chamber with the combustible mixture and produce other adverse side effects